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<!DOCTYPE HTML>
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<title>前端 · NOTEBOOK</title>
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算法
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<a href="#前端笔记总结" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><h1 id="前端笔记总结"><a name="前端笔记总结" class="anchor-navigation-ex-anchor" href="#前端笔记总结"><i class="fa fa-link" aria-hidden="true"></i></a>前端笔记总结</h1>
<h1 id="一-html"><a name="一-html" class="anchor-navigation-ex-anchor" href="#一-html"><i class="fa fa-link" aria-hidden="true"></i></a>一. HTML</h1>
<h2 id="1-简单标签"><a name="1-简单标签" class="anchor-navigation-ex-anchor" href="#1-简单标签"><i class="fa fa-link" aria-hidden="true"></i></a>1. 简单标签</h2>
<p>注释: <code><span class="token comment"><!--注释内容--></span></code></p>
<p>网页结构:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
网页标题及常规配置
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
网页显示内容
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre>
<p>换行: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>br</span> <span class="token punctuation">/></span></span></code></p>
<p>水平线: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>hr</span> <span class="token punctuation">/></span></span></code></p>
<p>空格: <code><span class="token entity named-entity" title=" ">&nbsp;</span></code> <code><span class="token entity named-entity" title=" ">&emsp;</span></code></p>
<blockquote>
<p>nbsp表示一个一个空格，emsp表示一个字符长。</p>
</blockquote>
<p>标题: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>标题内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>标题标签为h1到h6</p>
</blockquote>
<p>字体加粗: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>strong</span><span class="token punctuation">></span></span>内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>strong</span><span class="token punctuation">></span></span></code> <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>b</span><span class="token punctuation">></span></span>内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>b</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>strong有语气加强的作用</p>
</blockquote>
<p>字体倾斜: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>em</span><span class="token punctuation">></span></span>内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>em</span><span class="token punctuation">></span></span></code> <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>i</span><span class="token punctuation">></span></span>内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>i</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>em有语气加强的作用</p>
</blockquote>
<p>大于符号: <code><span class="token entity named-entity" title=">">&gt;</span></code></p>
<p>小于符号: <code><span class="token entity named-entity" title="<">&lt;</span></code></p>
<p>大于等于: <code>&gte</code></p>
<p>小于等于: <code>&lte</code></p>
<p>引号: <code><span class="token entity named-entity" title=""">&quot;</span></code></p>
<p>版权符号: <code><span class="token entity named-entity" title="©">&copy;</span></code></p>
<h2 id="2-图像标签"><a name="2-图像标签" class="anchor-navigation-ex-anchor" href="#2-图像标签"><i class="fa fa-link" aria-hidden="true"></i></a>2. 图像标签</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token punctuation">/></span></span></code></p>
<blockquote>
<p>src - 图片的链接<br>alt - 图片加载失败显示<br>title - 为鼠标悬停显示文字<br>width - 为宽度<br>height - 为高度</p>
</blockquote>
<h2 id="3-链接标签"><a name="3-链接标签" class="anchor-navigation-ex-anchor" href="#3-链接标签"><i class="fa fa-link" aria-hidden="true"></i></a>3. 链接标签</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span><span class="token punctuation">></span></span>内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>href - 链接的地址，<code>#name值</code>为当前页面锚点跳转<br>target - 打开网页的位置</p>
<blockquote>
<p><code>_blank</code> - 空白页打开<br><code>_self</code> - 当前页打开</p>
</blockquote>
<p>name - 定义锚点</p>
</blockquote>
<h2 id="4-列表"><a name="4-列表" class="anchor-navigation-ex-anchor" href="#4-列表"><i class="fa fa-link" aria-hidden="true"></i></a>4. 列表</h2>
<p>无序列表: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span>li标签内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>type - 无序列表前符号样式</p>
<blockquote>
<p>disc - 实心圆，默认<br>square - 实心框<br>circle - 空心圆</p>
</blockquote>
</blockquote>
<p>有序列表: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ol</span><span class="token punctuation">></span></span>li标签内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ol</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>type - 有序列表前符号样式</p>
<blockquote>
<p>1 - 数字<br>a/A - 字母大小写<br>i/I - 罗马数字大小写</p>
</blockquote>
</blockquote>
<p>自定义列表: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dl</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dt</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dt</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dd</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dd</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dl</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>dl - 声明定义列表<br>dt - 声明列表项<br>dd - 定义列表项内容
示例:</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dl</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dt</span><span class="token punctuation">></span></span>所属学院<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dt</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dd</span><span class="token punctuation">></span></span>计算机学院<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dd</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dt</span><span class="token punctuation">></span></span>专业<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dt</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dd</span><span class="token punctuation">></span></span>计算机软件工程<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dd</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dl</span><span class="token punctuation">></span></span>
</code></pre>
</blockquote>
<h2 id="5-表格"><a name="5-表格" class="anchor-navigation-ex-anchor" href="#5-表格"><i class="fa fa-link" aria-hidden="true"></i></a>5. 表格</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>table</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>table</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>border - 设置表格边框宽度<br>cellspacing - 边框宽度，html5不支持<br>align - 水平对齐方式</p>
<blockquote>
<p>left - 居左<br>center - 居中<br>right - 居右</p>
</blockquote>
<p>valign - 垂直对齐</p>
<blockquote>
<p>top - 顶部对齐<br>middle - 中部对齐<br>bottom - 底部对齐<br>baseline - 基线对齐</p>
</blockquote>
</blockquote>
<p>表格标题: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>caption</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>caption</span><span class="token punctuation">></span></span></code></p>
<p>表格页眉: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>thead</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>thead</span><span class="token punctuation">></span></span></code></p>
<p>表格页脚: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tfoot</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tfoot</span><span class="token punctuation">></span></span></code></p>
<p>表格主题: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tbody</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tbody</span><span class="token punctuation">></span></span></code></p>
<p>如果使用thead、tbody、tfoot元素，就必需使用全部元素，他们的顺序是thead、tfoot、tbody</p>
<p>表格行: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tr</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tr</span><span class="token punctuation">></span></span></code></p>
<p>表格头: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>th</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>th</span><span class="token punctuation">></span></span></code></p>
<p>单元格: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p>colspan - 跨行<br>rowspan - 跨列</p>
</blockquote>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>table</span> <span class="token attr-name">border</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>1<span class="token punctuation">"</span></span> <span class="token attr-name">cellspacing</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>5<span class="token punctuation">"</span></span> <span class="token attr-name">align</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>center<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>第一个单元格<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span> <span class="token attr-name">colspan</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>2<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>第二个单元格<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>第三个单元格<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>第四个单元格<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>td</span><span class="token punctuation">></span></span>第五个单元格<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>td</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>tr</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>table</span><span class="token punctuation">></span></span>
</code></pre>
<h2 id="6-表单"><a name="6-表单" class="anchor-navigation-ex-anchor" href="#6-表单"><i class="fa fa-link" aria-hidden="true"></i></a>6. 表单</h2>
<h3 id="原始内容"><a name="原始内容" class="anchor-navigation-ex-anchor" href="#原始内容"><i class="fa fa-link" aria-hidden="true"></i></a>原始内容</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p><code>name='值'</code> - 规定表单的名称<br><code>action='值'</code> - 提交表单的URL<br><code>method='get/post'</code> - 提交方式<br><code>enctype='值'</code> - 提交表单前进行编码，使用MIMO类型<br><code>target='_blank/_self/_parent/_top'</code> - 何处打开表单url<br><code>autocomplete='on/off'</code> - 是否启动表单自动完成<br><code>novalidate='novalidate'</code> - 不验证表单</p>
</blockquote>
<p>文本框: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">[value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>默认值<span class="token punctuation">"</span></span><span class="token attr-name">]</span><span class="token punctuation">/></span></span></code></p>
<p>密码框: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>password<span class="token punctuation">"</span></span> <span class="token attr-name">[placeholder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>密码<span class="token punctuation">"</span></span><span class="token attr-name">]</span><span class="token punctuation">/></span></span></code></p>
<p>提交按钮: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submit<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>按钮内容<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span></code></p>
<p>重置按钮: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>reset<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>按钮内容<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span></code></p>
<p>单选框/单选按钮: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>radio<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>xxx<span class="token punctuation">"</span></span> <span class="token attr-name">[checked</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>checked<span class="token punctuation">"</span></span><span class="token attr-name">]</span> <span class="token punctuation">/></span></span></code></p>
<p>按钮: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>button<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>按钮内容<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span></code></p>
<p>复选框: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>checkbox<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>xxx<span class="token punctuation">"</span></span> <span class="token attr-name">[disabled</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>disabled<span class="token punctuation">"</span></span><span class="token attr-name">]</span> <span class="token punctuation">/></span></span></code></p>
<p>下拉菜单: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>select</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>xxx<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span><span class="token punctuation">></span></span>菜单内容<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>select</span><span class="token punctuation">></span></span></code></p>
<p>多行文本框: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>textarea</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>xxx<span class="token punctuation">"</span></span> <span class="token attr-name">cols</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>字符宽度<span class="token punctuation">"</span></span> <span class="token attr-name">rows</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>行数<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>textarea</span><span class="token punctuation">></span></span></code></p>
<p>上传文件框: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>file<span class="token punctuation">"</span></span> <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>.png, .jpg, .jpeg<span class="token punctuation">"</span></span><span class="token punctuation">/></span></span></code></p>
<p>图像域: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100<span class="token punctuation">"</span></span> <span class="token attr-name">border</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>2<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>上传图片<span class="token punctuation">"</span></span><span class="token punctuation">></span></span></code></p>
<p>提示信息标签: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>lable</span> <span class="token attr-name">for</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>绑定控件id名<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>label</span><span class="token punctuation">></span></span></code></p>
<p>表单字段集: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>fieldset</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>fieldset</span><span class="token punctuation">></span></span></code></p>
<p>字段级标题: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>legend</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>legend</span><span class="token punctuation">></span></span></code></p>
<h3 id="html5-新增"><a name="html5-新增" class="anchor-navigation-ex-anchor" href="#html5-新增"><i class="fa fa-link" aria-hidden="true"></i></a>html5 新增</h3>
<p>datalist</p>
<p><code>datalist</code> 元素用于为文本框提供一个可供选择的列表</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>myColor<span class="token punctuation">"</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>myColor<span class="token punctuation">"</span></span> <span class="token attr-name">list</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mySuggestion<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>datalist</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mySuggestion<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span><span class="token punctuation">></span></span>black<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span><span class="token punctuation">></span></span>blue<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span><span class="token punctuation">></span></span>green<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>red<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>white<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>yellow<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>datalist</span><span class="token punctuation">></span></span>
</code></pre>
<p>autocomplete</p>
<p><code>autocomplete</code> 属性规定表单是否应该启用自动完成功能：自动完成允许浏览器预测对字段的输入，浏览器基于之前键入过的值，应该显示出在字段中填写的选项。可选项为<code>on</code>和<code>off</code></p>
<p>autofocus</p>
<p><code>autofocus</code> 属性规定在页面加载时，域自动地获得焦点。适用于所有 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签的类型。</p>
<p>form</p>
<p><code>form</code> 属性规定输入域所属的一个或多个表单。<code>form</code> 属性适用于所有 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签的类型。<code>form</code> 属性必须引用所属表单的 id。</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>form</span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>#<span class="token punctuation">"</span></span> <span class="token attr-name">method</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>get<span class="token punctuation">"</span></span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>user_form<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
First name:<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>fname<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>form</span><span class="token punctuation">></span></span>
Last name: <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lname<span class="token punctuation">"</span></span> <span class="token attr-name">form</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>user_form<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
</code></pre>
<p>multiple</p>
<p><code>multiple</code> 属性规定输入域中可选择多个值，适用于以下类型的 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签：<code>email</code> 和 <code>file</code>。</p>
<pre class="language-"><code class="lang-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>file<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>file<span class="token punctuation">"</span></span> <span class="token attr-name">multiple</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>multiple<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
</code></pre>
<p>novalidate</p>
<p><code>novalidate</code> 属性规定在提交表单时不应该验证 <code>form</code> 或 <code>input</code> 域，适用于form和部分input类型</p>
<p>pattern</p>
<p><code>pattern</code> 属性规定用于验证 input 域的模式（pattern）。模式（pattern） 是正则表达式。<code>pattern</code> 属性适用于以下类型的 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签：<code>text</code>, <code>search</code>, <code>url</code>, <code>telephone</code>, <code>email</code> 以及 <code>password</code>。</p>
<p>placeholder</p>
<p><code>placeholder</code> 属性提供一种提示（hint），描述输入域所期待的值。适用于以下类型的 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签：<code>text</code>, <code>search</code>, <code>url</code>, <code>telephone</code>, <code>email</code> 以及 <code>password</code></p>
<p>required</p>
<p><code>required</code> 属性规定必须在提交之前填写输入域（不能为空）。适用于以下类型的 <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>input</span><span class="token punctuation">></span></span></code> 标签：<code>text</code>, <code>search</code>, <code>url</code>, <code>telephone</code>, <code>email</code>, <code>password</code>, <code>date pickers</code>, <code>number</code>, <code>checkbox</code>, <code>radio</code> 以及 <code>file</code>。</p>
<p>新增input类型</p>
<p>email, url, number, range</p>
<p>number和range属性：</p>
<ul>
<li>max: 最大值</li>
<li>min: 最小值</li>
<li>value: 默认值</li>
<li>step: 数字间隔</li>
</ul>
<p>时间日期选择器：</p>
<ul>
<li>date - 选取日、月、年</li>
<li>month - 选取月、年</li>
<li>week - 选取周和年</li>
<li>time - 选取时间（小时和分钟）</li>
<li>datetime - 选取时间、日、月、年（UTC 时间）注意：此类型已被弃用，目前大多数浏览器都不再支持。</li>
<li>datetime-local - 选取时间、日、月、年（本地时间）</li>
</ul>
<p>color 类型用于选择颜色</p>
<h2 id="7-菜单"><a name="7-菜单" class="anchor-navigation-ex-anchor" href="#7-菜单"><i class="fa fa-link" aria-hidden="true"></i></a>7. 菜单</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>select</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>select<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>select</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p><code>size</code>: 表示下拉框展示的数据长度，更多数据使用滚动条</p>
</blockquote>
<p>选项内容: <code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>option</span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>提交值<span class="token punctuation">"</span></span><span class="token attr-name">,</span> <span class="token attr-name">selected</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>selected<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>展示值<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>option</span><span class="token punctuation">></span></span></code></p>
<h2 id="8-文本域"><a name="8-文本域" class="anchor-navigation-ex-anchor" href="#8-文本域"><i class="fa fa-link" aria-hidden="true"></i></a>8. 文本域</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>textarea</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p><code>clos</code> 表示列数</p>
<p><code>rows</code>: 表示行数</p>
</blockquote>
<h2 id="9-框架"><a name="9-框架" class="anchor-navigation-ex-anchor" href="#9-框架"><i class="fa fa-link" aria-hidden="true"></i></a>9. 框架</h2>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span></code></p>
<blockquote>
<p><code>src</code>: 地址</p>
<p><code>width</code>: 宽</p>
<p><code>height</code>: 高</p>
<p><code>frameborder</code>: 边框宽度</p>
</blockquote>
<p>将a标签的target设置为和iframe的name属性值一致，则可以点击a标签在iframe中加载网页</p>
<h2 id="10-html5标签"><a name="10-html5标签" class="anchor-navigation-ex-anchor" href="#10-html5标签"><i class="fa fa-link" aria-hidden="true"></i></a>10. HTML5标签</h2>
<h3 id="section"><a name="section" class="anchor-navigation-ex-anchor" href="#section"><i class="fa fa-link" aria-hidden="true"></i></a>section</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>section</span><span class="token punctuation">></span></span></code> 表示文档中的一个区域（或节）。比如章节、页眉、页脚或文档中的其他部分，一般来说会包含一个标题。</p>
<h3 id="article"><a name="article" class="anchor-navigation-ex-anchor" href="#article"><i class="fa fa-link" aria-hidden="true"></i></a>article</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>article</span><span class="token punctuation">></span></span></code> 标签定义独立的内容。常常使用在论坛帖子，报纸文章，博客条目，用户评论等独立的内容项目之中。<code>article</code> 可以嵌套，内层的 <code>article</code> 对外层的 <code>article</code> 标签有隶属关系。</p>
<h3 id="nav"><a name="nav" class="anchor-navigation-ex-anchor" href="#nav"><i class="fa fa-link" aria-hidden="true"></i></a>nav</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>nav</span><span class="token punctuation">></span></span></code> 标签定义导航链接的部分：描绘一个含有多个超链接的区域，这个区域包含转到其他页面，或者页面内部其他部分的链接列表。</p>
<h3 id="header"><a name="header" class="anchor-navigation-ex-anchor" href="#header"><i class="fa fa-link" aria-hidden="true"></i></a>header</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>header</span><span class="token punctuation">></span></span></code> 标签定义文档的页眉，通常是一些引导和导航信息。它不局限于写在网页头部，也可以写在网页内容里面。</p>
<h3 id="footer"><a name="footer" class="anchor-navigation-ex-anchor" href="#footer"><i class="fa fa-link" aria-hidden="true"></i></a>footer</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>footer</span><span class="token punctuation">></span></span></code> 标签定义 section 或 document 的页脚，包含了与页面、文章或是部分内容有关的信息，比如说文章的作者或者日期。 它和 <code>header</code> 标签使用基本一样，可以在一个页面中多次使用，如果在一个区段的后面加入了 <code>footer</code> 标签，那么它就相当于该区段的页脚了。</p>
<h3 id="aside"><a name="aside" class="anchor-navigation-ex-anchor" href="#aside"><i class="fa fa-link" aria-hidden="true"></i></a>aside</h3>
<p><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>aside</span><span class="token punctuation">></span></span></code> 标签表示一个和其余页面内容几乎无关的部分，被认为是独立于该内容的一部分并且可以被单独的拆分出来而不会使整体受影响。其通常表现为侧边栏或者嵌入内容。他们通常包含在工具条，例如来自词汇表的定义。也可能有其他类型的信息，例如相关的广告、笔者的传记、web 应用程序、个人资料信息，或在博客上的相关链接。</p>
<h2 id="11-web-storage"><a name="11-web-storage" class="anchor-navigation-ex-anchor" href="#11-web-storage"><i class="fa fa-link" aria-hidden="true"></i></a>11. Web Storage</h2>
<p>localStorage</p>
<p><code>localStorage.setItem(key,value)</code> - 在本地客户端存储一个字符串类型的数据。</p>
<p><code>localStorage.setItem.key=value</code> - 也可以像这样直接存储。</p>
<p><code>localStorage.getItem(key)</code> - 读取已存储在本地的数据，获取键值。</p>
<p><code>localStorage.key</code> - 也可以像这样直接获取值。</p>
<p><code>localStorage.removeItem(key)</code> - 移除已存储在本地数据，通过键名作为参数删除数据。</p>
<p><code>localStorage.clear()</code> - 也可以一次性清除</p>
<p>sessionStorage用法和localStorage用法类似</p>
<h1 id="二-css"><a name="二-css" class="anchor-navigation-ex-anchor" href="#二-css"><i class="fa fa-link" aria-hidden="true"></i></a>二. CSS</h1>
<h2 id="1-基本信息"><a name="1-基本信息" class="anchor-navigation-ex-anchor" href="#1-基本信息"><i class="fa fa-link" aria-hidden="true"></i></a>1. 基本信息</h2>
<p>注释: <code>/* */</code></p>
<h2 id="2-选择器"><a name="2-选择器" class="anchor-navigation-ex-anchor" href="#2-选择器"><i class="fa fa-link" aria-hidden="true"></i></a>2. 选择器</h2>
<ol>
<li>标签选择器</li>
</ol>
<p>语法: <code>元素名称{属性:属性值;}</code></p>
<p>例句: <code>p{background:red;}</code></p>
<ol>
<li>id选择器</li>
</ol>
<p>语法: <code>#id名称{属性:属性值;}</code></p>
<p>例句: <code>#para1{text-align:center;}</code></p>
<ol>
<li>class选择器</li>
</ol>
<p>语法: <code>.class类名{属性:属性值;}</code></p>
<p>例句: <code>.top{width:200px;}</code></p>
<ol>
<li>*通配符（全局选择器）</li>
</ol>
<p>语法: <code>*{属性:属性值;}</code></p>
<p>例句: <code>*{padding:0;margin:0;}</code></p>
<ol>
<li>交集选择器</li>
</ol>
<p>语法: <code>选择器1选择器2{属性:属性值;}</code></p>
<p>例句:<code>h1#center{color:red;}</code></p>
<p>注意: 两个选择器中不能有空格，必须连续书写</p>
<ol>
<li>并集选择器</li>
</ol>
<p>语法: <code>选择器1,选择器2{属性:属性值;}</code></p>
<p>例句: <code>h1,div,#ppp{background:red;}</code></p>
<ol>
<li>后代选择器</li>
</ol>
<p>语法: <code>选择器1 选择器2{属性:属性值;}</code></p>
<p>例句: <code>p div{color:red;}</code></p>
<ol>
<li>子选择器</li>
</ol>
<p>语法: <code>选择器1>选择器2{属性:属性值;}</code></p>
<p>例句: <code>p>div{属性:属性值;}</code></p>
<ol>
<li>伪类选择器
语法:<blockquote>
<p><code>a:link{属性:属性值;}</code> - 超链接的初始状态</p>
<p><code>a:visited{属性:属性值;}</code> - 超链接被访问后的状态</p>
<p><code>a:hover{属性:属性值;}</code> - 鼠标悬停,即鼠标滑过超链接的状态</p>
<p><code>a:active{属性:属性值;}</code> - 超链接被激活的状态,即鼠标按下时超链接的状态</p>
</blockquote>
</li>
</ol>
<h2 id="3-显示和隐藏"><a name="3-显示和隐藏" class="anchor-navigation-ex-anchor" href="#3-显示和隐藏"><i class="fa fa-link" aria-hidden="true"></i></a>3. 显示和隐藏</h2>
<p><code>display:none;</code> - 隐藏元素,该方式隐藏在页面中不占位</p>
<p><code>visibility:hidden;</code> - 隐藏元素,该方式隐藏的元素在页面中占位</p>
<h2 id="4-背景"><a name="4-背景" class="anchor-navigation-ex-anchor" href="#4-背景"><i class="fa fa-link" aria-hidden="true"></i></a>4. 背景</h2>
<p>background - 简写属性，作用是将背景属性设置在一个声明中</p>
<p>background-attachment - 背景图像是否固定或者随着页面的其余部分滚动</p>
<blockquote>
<p>scroll - 默认,滚动</p>
<p>fixed - 不滚动</p>
<p>inherit - 继承父元素设置</p>
</blockquote>
<p>background-color - 设置元素的背景颜色</p>
<blockquote>
<p>可以使用颜色的单词,也可以使用rgb来表示颜色(#000000)</p>
</blockquote>
<p>background-image - 把图像设置为背景(url(floder/img.gif))</p>
<blockquote>
<p>默认值是none,如果需要设置背景色,需要设置一个url值.</p>
</blockquote>
<p>background-position - 设置背景图像的起始位置</p>
<blockquote>
<p>top/bottom/left/right/center/100px/5cm</p>
</blockquote>
<p>background-repeat - 设置背景图像是否及如何重复</p>
<blockquote>
<p>no-repeat/repeat/repeat-x/repeat-y</p>
</blockquote>
<h2 id="5-文本"><a name="5-文本" class="anchor-navigation-ex-anchor" href="#5-文本"><i class="fa fa-link" aria-hidden="true"></i></a>5. 文本</h2>
<ol>
<li>文本样式的font属性
font-size - 文本大小<blockquote>
<p>xx-small/x-small/small/medium/large/x-large/xx-large</p>
</blockquote>
</li>
</ol>
<p>font-family - 文本字体</p>
<p>font-weight - 文本粗细:(400对应默认字体)</p>
<p>font-style - 文本倾斜</p>
<blockquote>
<p>normal - 默认,正常字体</p>
<p>italic - 倾斜字体</p>
<p>oblique - 倾斜字体</p>
<p>inherit - 继承父元素样式</p>
</blockquote>
<p>color - 文本颜色</p>
<p>line-heigh - 文本行高</p>
<blockquote>
<p>normal - 默认值</p>
<p>number - 设置数字,与当前字体相乘</p>
<p>length - 固定的行间距</p>
</blockquote>
<ol>
<li>文本样式的text属性</li>
</ol>
<p>text-align - 水平对齐方式</p>
<blockquote>
<p>left/right/center/justify(两端对齐)</p>
</blockquote>
<p>vertical-align - 垂直对齐方式</p>
<blockquote>
<p>top/buttom/middle</p>
</blockquote>
<ol>
<li>文本样式修饰的运用规范</li>
</ol>
<p>text-decoration - 文本修饰</p>
<blockquote>
<p>none/underline(下划线)/overline(上划线)/line-through(添加删除)/blink(删除)</p>
</blockquote>
<p>text-indent - 文本缩进</p>
<blockquote>
<p>value(数值,可以取负值,缩进在左边,只对首行起作用)</p>
</blockquote>
<p>letter-spacing - 字符间距</p>
<blockquote>
<p>value(英文字母之间的间距)</p>
</blockquote>
<p>word-spacing - 字间距</p>
<blockquote>
<p>value(英文单词之间的间距)</p>
</blockquote>
<p>white-space - 元素空白的处理方式</p>
<blockquote>
<p>normal - 空白被浏览器忽略</p>
<p>pre - 空白会被浏览器保留</p>
<p>nowrap - 文本不会换行</p>
<p>pre-wrap - 保留空白符序列，但是正常地进行换行</p>
<p>pre-line - 合并空白符序列，但是保留换行符</p>
</blockquote>
<p>text-transform - 控制元素中的字母</p>
<blockquote>
<p>capitalize - 文本中的每个单词以大写字母开头</p>
<p>uppercase - 所有字母转大写</p>
<p>lowercase - 所有字母转小写</p>
</blockquote>
<p>text-shadow - 文字添加阴影</p>
<blockquote>
<p>h-shadow - 必需,水平阴影的位置,允许负值</p>
<p>v-shadow - 必需,垂直阴影的位置,允许负值</p>
<p>blur - 可选,模糊的距离</p>
<p>color - 阴影的颜色</p>
</blockquote>
<p>word-wrap - 自动换行</p>
<blockquote>
<p>normal - 默认,只允许在断字典换行</p>
<p>break-word - 在长单词或url内部进行换行</p>
</blockquote>
<h2 id="6-列表"><a name="6-列表" class="anchor-navigation-ex-anchor" href="#6-列表"><i class="fa fa-link" aria-hidden="true"></i></a>6. 列表</h2>
<p>list-style - 简写属性,用于把所有用于列表的属性设置在一个声明中</p>
<p>list-style-image - 将图像设置为列表项标志</p>
<p>list-style-position - 设置列表中列表项标志的位置</p>
<blockquote>
<p>inside - 列表项目标记放置在文本以内，且环绕文本根据标记对齐</p>
<p>outside - 默认值，保持标记位于文本的左侧</p>
</blockquote>
<p>list-style-type - 设置列表项标志的类型 </p>
<blockquote>
<p>none - 无标记</p>
<p>disc - 默认，标记是实心圆</p>
<p>circle - 标记是空心圆</p>
<p>square - 标记是实心方块</p>
<p>list-style-type:url(floder/img.gif) - 图片作为列表符号</p>
</blockquote>
<h2 id="7-盒子模型"><a name="7-盒子模型" class="anchor-navigation-ex-anchor" href="#7-盒子模型"><i class="fa fa-link" aria-hidden="true"></i></a>7. 盒子模型</h2>
<p>overflow - 控制内容溢出元素框时在对应的元素区间内添加滚动条</p>
<blockquote>
<p>visible - 默认值。内容不会被修剪，会呈现在元素框之外。</p>
<p>hidden - 内容会被修剪，并且其余内容是不可见的。</p>
<p>scroll - 内容会被修剪，但是浏览器会显示滚动条以便查看其余的内容。</p>
<p>auto - 如果内容被修剪，则浏览器会显示滚动条以便查看其余的内容。</p>
</blockquote>
<p>text-overflow - 针对文本(必需和overflow:hidden;white-space:nowrap;一起使用)</p>
<blockquote>
<p>clip - 修剪文本</p>
<p>ellipsis - 显示省略号来代表被修剪的文本</p>
<p>string - 使用给定的字符串来代表被修剪的文本</p>
</blockquote>
<p><code>width:值</code> - 盒模型的宽</p>
<p><code>height:值</code> - 盒模型的高</p>
<p><code>background-color:值</code> - 盒模型的背景</p>
<p><code>background-image:url(图片地址)</code> - 盒模型的背景图片</p>
<p><code>border:线型(solid/dashed/dotted/double) 粗细(数值＋单位) 颜色;</code> - 盒模型的边框</p>
<p><code>border-style</code> - 设置样式</p>
<p><code>border-width</code> - 边框宽度</p>
<p><code>border-color</code> - 设置颜色</p>
<p><code>border-bottom</code> - 下边框</p>
<p><code>border-top</code> - 上边框</p>
<p><code>border-left</code> - 左边框</p>
<p><code>border-right</code> - 右边框</p>
<h1 id="三-javascript基础语法"><a name="三-javascript基础语法" class="anchor-navigation-ex-anchor" href="#三-javascript基础语法"><i class="fa fa-link" aria-hidden="true"></i></a>三. JavaScript基础语法</h1>
<h2 id="1基本介绍"><a name="1基本介绍" class="anchor-navigation-ex-anchor" href="#1基本介绍"><i class="fa fa-link" aria-hidden="true"></i></a>1.基本介绍</h2>
<p>js是javascript的缩写，是web标准中的行为标准，主要负责网页中内容的改变</p>
<p>js是编程语言，是脚本语言。主要针对脚本开发</p>
<p><strong>注意:js中严格区分大小写</strong></p>
<p>1)内联 -> js代码写在标签事件相关属性中,例如:onclick</p>
<p>2)内部 -> js代码写在script标签中(script标签放在html中任何位置都有效)</p>
<p>3)外部 -> js代码写在js文件中,然后通过script标签在html中导入（导入相当于执行）</p>
<h2 id="2注释同c"><a name="2注释同c" class="anchor-navigation-ex-anchor" href="#2注释同c"><i class="fa fa-link" aria-hidden="true"></i></a>2.注释(同C)</h2>
<p>单行注释://</p>
<p>多行注释:<code>/* */</code></p>
<h2 id="3数据类型"><a name="3数据类型" class="anchor-navigation-ex-anchor" href="#3数据类型"><i class="fa fa-link" aria-hidden="true"></i></a>3.数据类型</h2>
<h3 id="31-关键字"><a name="31-关键字" class="anchor-navigation-ex-anchor" href="#31-关键字"><i class="fa fa-link" aria-hidden="true"></i></a>3.1 关键字</h3>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">break</span> <span class="token keyword">else</span> <span class="token keyword">new</span> <span class="token class-name">var</span> <span class="token keyword">typeof</span>
<span class="token keyword">case</span> finally <span class="token keyword">return</span> <span class="token keyword">void</span>
catch <span class="token keyword">for</span> <span class="token keyword">switch</span> <span class="token keyword">while</span>
<span class="token keyword">default</span> <span class="token keyword">if</span> <span class="token keyword">throw</span> <span class="token keyword">delete</span>
<span class="token keyword">in</span> <span class="token keyword">try</span> <span class="token keyword">do</span> <span class="token keyword">instanceof</span>
</code></pre>
<h3 id="32-数据类型"><a name="32-数据类型" class="anchor-navigation-ex-anchor" href="#32-数据类型"><i class="fa fa-link" aria-hidden="true"></i></a>3.2 数据类型</h3>
<p>Number:数字类型</p>
<p>String:字符串</p>
<p>Boolean:布尔值</p>
<p>Array:数组</p>
<p>Object:对象</p>
<p>Map:map对象(同python中的字典)(ES6)</p>
<p>Set:set对象(同python中的集合,(元素不重复))(ES6)</p>
<p>NaN:not a number,注意:NaN===NaN结果为false,判断是否为NaN用isNaN()</p>
<pre class="language-"><code class="lang-javascript"><span class="token number">NaN</span> <span class="token operator">===</span> <span class="token number">NaN</span> <span class="token comment">//false</span>
<span class="token function">isNaN</span><span class="token punctuation">(</span><span class="token number">NaN</span><span class="token punctuation">)</span> <span class="token comment">//true</span>
</code></pre>
<p>null:表示空</p>
<p>undefined:表示未定义</p>
<p>判断数据类型的方法用typeof</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">typeof</span> <span class="token number">123</span><span class="token punctuation">;</span> <span class="token comment">//number</span>
</code></pre>
<h3 id="33-变量"><a name="33-变量" class="anchor-navigation-ex-anchor" href="#33-变量"><i class="fa fa-link" aria-hidden="true"></i></a>3.3 变量</h3>
<h4 id="321-变量名命名规范"><a name="321-变量名命名规范" class="anchor-navigation-ex-anchor" href="#321-变量名命名规范"><i class="fa fa-link" aria-hidden="true"></i></a>3.2.1 变量名命名规范</h4>
<p>数字 字母 _ $组成,数字不能开头</p>
<p>使用驼峰命名方式</p>
<h4 id="322-直接赋值"><a name="322-直接赋值" class="anchor-navigation-ex-anchor" href="#322-直接赋值"><i class="fa fa-link" aria-hidden="true"></i></a>3.2.2 直接赋值</h4>
<p>变量名 = 值</p>
<p>注意:不管声明在什么地方,都是全局的</p>
<h4 id="323-var-变量名"><a name="323-var-变量名" class="anchor-navigation-ex-anchor" href="#323-var-变量名"><i class="fa fa-link" aria-hidden="true"></i></a>3.2.3 var 变量名</h4>
<p>var 变量名 = 值</p>
<p>注意:如果声明在函数中,那么这个变量只能在函数中使用</p>
<h4 id="324-let-变量名"><a name="324-let-变量名" class="anchor-navigation-ex-anchor" href="#324-let-变量名"><i class="fa fa-link" aria-hidden="true"></i></a>3.2.4 let 变量名</h4>
<p>let 变量名 = 值</p>
<p>注意:let声明的变量的作用域是当前{}中,如果没有声明在{}中就没有约束效果</p>
<h4 id="325-多个变量同时赋值"><a name="325-多个变量同时赋值" class="anchor-navigation-ex-anchor" href="#325-多个变量同时赋值"><i class="fa fa-link" aria-hidden="true"></i></a>3.2.5 多个变量同时赋值</h4>
<p>ES6中新增了构析方法,可以同时对多个变量进行赋值</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">var</span> <span class="token punctuation">[</span>x<span class="token punctuation">,</span> y<span class="token punctuation">,</span> z<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'hello'</span><span class="token punctuation">,</span> <span class="token string">'JavaScript'</span><span class="token punctuation">,</span> <span class="token string">'ES6'</span><span class="token punctuation">]</span>
</code></pre>
<h3 id="34-常量"><a name="34-常量" class="anchor-navigation-ex-anchor" href="#34-常量"><i class="fa fa-link" aria-hidden="true"></i></a>3.4 常量</h3>
<p>声明方法:const 常量名 = 值</p>
<h2 id="4运算符"><a name="4运算符" class="anchor-navigation-ex-anchor" href="#4运算符"><i class="fa fa-link" aria-hidden="true"></i></a>4.运算符</h2>
<h3 id="41-数学运算符"><a name="41-数学运算符" class="anchor-navigation-ex-anchor" href="#41-数学运算符"><i class="fa fa-link" aria-hidden="true"></i></a>4.1 数学运算符</h3>
<p><code>+, -, *, /, %, **(幂运算) ++自增加运算</code></p>
<h3 id="42-比较运算符"><a name="42-比较运算符" class="anchor-navigation-ex-anchor" href="#42-比较运算符"><i class="fa fa-link" aria-hidden="true"></i></a>4.2 比较运算符</h3>
<p><code>>, <, ==, !=, >=, <=, ===, !==</code></p>
<p><code>==\!=</code> -> 先自动转换类型,再进行比较</p>
<p><code>===\!==</code> -> 不自动转换类型,直接比较</p>
<h3 id="43-逻辑运算符"><a name="43-逻辑运算符" class="anchor-navigation-ex-anchor" href="#43-逻辑运算符"><i class="fa fa-link" aria-hidden="true"></i></a>4.3 逻辑运算符</h3>
<p>逻辑与&& 逻辑或|| 逻辑非!</p>
<h2 id="5判断循环结构"><a name="5判断循环结构" class="anchor-navigation-ex-anchor" href="#5判断循环结构"><i class="fa fa-link" aria-hidden="true"></i></a>5.判断\循环结构</h2>
<h3 id="51-选择结构"><a name="51-选择结构" class="anchor-navigation-ex-anchor" href="#51-选择结构"><i class="fa fa-link" aria-hidden="true"></i></a>5.1 选择结构</h3>
<h4 id="511-if语句"><a name="511-if语句" class="anchor-navigation-ex-anchor" href="#511-if语句"><i class="fa fa-link" aria-hidden="true"></i></a>5.1.1 if语句</h4>
<p>1)</p>
<p>if(条件语句){</p>
<p>​ 代码段</p>
<p>}</p>
<p>2)</p>
<p>if(条件语句){</p>
<p>​ 代码段1</p>
<p>}else{</p>
<p>​ 代码段2</p>
<p>}</p>
<p>3)</p>
<p>if(条件语句1){</p>
<p>​ 代码段2</p>
<p>}else if(条件语句2){</p>
<p>​ 代码段2</p>
<p>}else if(条件语句3){</p>
<p>​ 代码段3</p>
<p>}else{</p>
<p>​ 代码段N</p>
<p>}</p>
<h4 id="512-switch语句"><a name="512-switch语句" class="anchor-navigation-ex-anchor" href="#512-switch语句"><i class="fa fa-link" aria-hidden="true"></i></a>5.1.2 switch语句</h4>
<p>switch(表达式){</p>
<p>​ case 值1:{</p>
<p>​ 代码段2
​ }</p>
<p>​ case 值2:{</p>
<p>​ 代码段2
​ }</p>
<p>​ ......</p>
<p>​ default:{</p>
<p>​ 代码段N</p>
<p>​ }</p>
<p>}</p>
<h4 id="513-三目运算符"><a name="513-三目运算符" class="anchor-navigation-ex-anchor" href="#513-三目运算符"><i class="fa fa-link" aria-hidden="true"></i></a>5.1.3 三目运算符</h4>
<p>表达式?表达式1:表达式2</p>
<h3 id="52-循环结构"><a name="52-循环结构" class="anchor-navigation-ex-anchor" href="#52-循环结构"><i class="fa fa-link" aria-hidden="true"></i></a>5.2 循环结构</h3>
<h4 id="521-while循环"><a name="521-while循环" class="anchor-navigation-ex-anchor" href="#521-while循环"><i class="fa fa-link" aria-hidden="true"></i></a>5.2.1 while循环</h4>
<p>语法一:</p>
<p>while(条件语句){</p>
<p>​ 循环体</p>
<p>}</p>
<p>语法二:</p>
<p>do{</p>
<p>​ 循环体</p>
<p>}while(条件语句)</p>
<h4 id="522-for循环"><a name="522-for循环" class="anchor-navigation-ex-anchor" href="#522-for循环"><i class="fa fa-link" aria-hidden="true"></i></a>5.2.2 for循环</h4>
<p>语法一:</p>
<p>for(变量 in 序列){</p>
<p>​ 循环体</p>
<p>}</p>
<p>注意:变量取到的不是元素,是下标或者属性名</p>
<p>语法二:</p>
<p>for(表达式1;表达式2;表达式3){</p>
<p>​ 循环体</p>
<p>}</p>
<h4 id="523-循环中的关键字"><a name="523-循环中的关键字" class="anchor-navigation-ex-anchor" href="#523-循环中的关键字"><i class="fa fa-link" aria-hidden="true"></i></a>5.2.3 循环中的关键字</h4>
<p>break,continue用法同C语言和Python语言</p>
<h2 id="6函数"><a name="6函数" class="anchor-navigation-ex-anchor" href="#6函数"><i class="fa fa-link" aria-hidden="true"></i></a>6.函数</h2>
<h3 id="61-函数的声明"><a name="61-函数的声明" class="anchor-navigation-ex-anchor" href="#61-函数的声明"><i class="fa fa-link" aria-hidden="true"></i></a>6.1 函数的声明</h3>
<p>function 函数名(参数名1,参数名2,...){</p>
<p>​ 函数体</p>
<p>​ return 返回值</p>
<p>}</p>
<p>说明: 无返回值其实是返回undefined</p>
<h3 id="62-函数的参数"><a name="62-函数的参数" class="anchor-navigation-ex-anchor" href="#62-函数的参数"><i class="fa fa-link" aria-hidden="true"></i></a>6.2 函数的参数</h3>
<h4 id="621-关键字参数无效"><a name="621-关键字参数无效" class="anchor-navigation-ex-anchor" href="#621-关键字参数无效"><i class="fa fa-link" aria-hidden="true"></i></a>6.2.1 关键字参数无效</h4>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">stu</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span>age</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'我是'</span><span class="token operator">+</span>name<span class="token operator">+</span><span class="token string">',我今年'</span><span class="token operator">+</span>age<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token function">stu</span><span class="token punctuation">(</span>age<span class="token operator">=</span><span class="token number">18</span><span class="token punctuation">,</span>name<span class="token operator">=</span>’小明’<span class="token punctuation">)</span> <span class="token comment">//我是18,我今年小明</span>
</code></pre>
<h4 id="622-arguments"><a name="622-arguments" class="anchor-navigation-ex-anchor" href="#622-arguments"><i class="fa fa-link" aria-hidden="true"></i></a>6.2.2 arguments</h4>
<p>js中所有的函数,都可以接收不定长的参数.除了通过形参以外,可以通过函数中的arguments去获取实参</p>
<h4 id="623-rest"><a name="623-rest" class="anchor-navigation-ex-anchor" href="#623-rest"><i class="fa fa-link" aria-hidden="true"></i></a>6.2.3 rest</h4>
<p>ES6中新定义了一个函数参数rest,rest主要是接受除了赋值意外多余的传入参数,以数组的形式保存,rest只能写在最后面,前面用三个点隔开</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">foo</span><span class="token punctuation">(</span><span class="token parameter">a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> <span class="token operator">...</span>rest</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'a = '</span> <span class="token operator">+</span> a<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'b = '</span> <span class="token operator">+</span> b<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rest<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">foo</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 结果:</span>
<span class="token comment">// a = 1</span>
<span class="token comment">// b = 2</span>
<span class="token comment">// Array [ 3, 4, 5 ]</span>
</code></pre>
<h3 id="62-匿名函数"><a name="62-匿名函数" class="anchor-navigation-ex-anchor" href="#62-匿名函数"><i class="fa fa-link" aria-hidden="true"></i></a>6.2 匿名函数</h3>
<p>变量 = function (参数名1,参数名2,...){</p>
<p>​ 函数体</p>
<p>}</p>
<h3 id="63-箭头函数"><a name="63-箭头函数" class="anchor-navigation-ex-anchor" href="#63-箭头函数"><i class="fa fa-link" aria-hidden="true"></i></a>6.3 箭头函数</h3>
<p>(参数列表)=>{函数体}</p>
<p>箭头函数的this始终指向外层调用这的object</p>
<pre class="language-"><code class="lang-javascript"><span class="token comment">//写法一</span>
<span class="token function-variable function">func3</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">x<span class="token punctuation">,</span> y</span><span class="token punctuation">)</span><span class="token operator">=></span>x<span class="token operator">+</span>y
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">func3</span><span class="token punctuation">(</span><span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token comment">//写法二</span>
<span class="token function-variable function">func3</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">x<span class="token punctuation">,</span> y</span><span class="token punctuation">)</span><span class="token operator">=></span><span class="token punctuation">{</span>
<span class="token keyword">return</span> x<span class="token operator">+</span>y
<span class="token punctuation">}</span>
</code></pre>
<h3 id="64-迭代器"><a name="64-迭代器" class="anchor-navigation-ex-anchor" href="#64-迭代器"><i class="fa fa-link" aria-hidden="true"></i></a>6.4 迭代器</h3>
<p>和python中一样,定义方法为function后面加<code>*</code>号</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span><span class="token operator">*</span> <span class="token function">fib</span><span class="token punctuation">(</span><span class="token parameter">max</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span>
b <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span>
n <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>n <span class="token operator"><</span> max<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">yield</span> a<span class="token punctuation">;</span>
<span class="token punctuation">[</span>a<span class="token punctuation">,</span> b<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span>b<span class="token punctuation">,</span> a <span class="token operator">+</span> b<span class="token punctuation">]</span><span class="token punctuation">;</span>
n <span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h2 id="7字符串"><a name="7字符串" class="anchor-navigation-ex-anchor" href="#7字符串"><i class="fa fa-link" aria-hidden="true"></i></a>7.字符串</h2>
<h3 id="7-1-字符串相关属性"><a name="7-1-字符串相关属性" class="anchor-navigation-ex-anchor" href="#7-1-字符串相关属性"><i class="fa fa-link" aria-hidden="true"></i></a>7. 1 字符串相关属性</h3>
<p>字符串.length</p>
<h3 id="7-2-字符串相关方法"><a name="7-2-字符串相关方法" class="anchor-navigation-ex-anchor" href="#7-2-字符串相关方法"><i class="fa fa-link" aria-hidden="true"></i></a>7. 2 字符串相关方法</h3>
<p>用<code>arr = new Array</code>方式创建后用<code>console.log(arr)</code>打印,然后在浏览器中展开就能看到全部的方法</p>
<p><code>字符串.toUpperCase()</code> - 把一个字符串全部变为大写</p>
<p><code>字符串.toLowerCase ()</code> - 把一个字符串全部变为小写</p>
<p><code>字符串.indexOf (字符串2)</code> - 搜索字符串2在字符串中出现的位置,成功返回位置下标,失败返回-1</p>
<p><code>字符串.lastIndexOf(字符串)</code> - 从右查找str中是否有括号中的字符串,有返回第一个字符的下标,没有返回-1</p>
<p><code>字符串.substring(下标1,下标2)</code> - 返回字符串下标1到下标2的字符串,不包含下标2</p>
<p><code>字符串.substr(起始下标,截取长度)</code> - 从起始下标开始,截取指定长度的字符串</p>
<p><code>字符串.charAt(下标)</code> - 获取下标对应的值</p>
<p><code>字符串.charCodeAt(下标)</code> - 获取对应下标值的ASCII码值</p>