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<a class="post-title-link" href="/2019/11/04/js-操作符/" itemprop="url">js == 操作符</a></h1>
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<p>The comparison x == y, where x and y are values, produces true or false. Such a comparison is performed as follows:</p>
<ol>
<li><p>If Type(x) is the same as Type(y), then</p>
<ul>
<li>If Type(x) is Undefined, return true.</li>
<li>If Type(x) is Null, return true.</li>
<li>If Type(x) is Number, then</li>
<li>If x is NaN, return false.</li>
<li>If y is NaN, return false.</li>
<li>If x is the same Number value as y, return true.</li>
<li>If x is +0 and y is −0, return true.</li>
<li>If x is −0 and y is +0, return true.</li>
<li>Return false.</li>
<li>If Type(x) is String, then return true if x and y are exactly the same sequence of characters (same length and same characters in corresponding positions). Otherwise, return false.</li>
<li>If Type(x) is Boolean, return true if x and y are both true or both false. Otherwise, return false.</li>
<li>Return true if x and y refer to the same object. Otherwise, return false.</li>
</ul>
</li>
<li><p>If x is null and y is undefined, return true.</p>
</li>
<li>If x is undefined and y is null, return true.</li>
<li>If Type(x) is Number and Type(y) is String, \<br>return the result of the comparison x == ToNumber(y).</li>
<li>If Type(x) is String and Type(y) is Number, \<br>return the result of the comparison ToNumber(x) == y.</li>
<li>If Type(x) is Boolean, return the result of the comparison ToNumber(x) == y.</li>
<li>If Type(y) is Boolean, return the result of the comparison x == ToNumber(y).</li>
<li>If Type(x) is either String or Number and Type(y) is Object,<br>return the result of the comparison x == ToPrimitive(y).</li>
<li>If Type(x) is Object and Type(y) is either String or Number,<br>return the result of the comparison ToPrimitive(x) == y.</li>
<li><p>Return false.<br><strong>NOTE 1</strong> Given the above definition of equality:</p>
<p>String comparison can be forced by: “” + a == “” + b.<br>Numeric comparison can be forced by: +a == +b.<br>Boolean comparison can be forced by: !a == !b.</p>
</li>
</ol>
<p><strong>NOTE 2</strong> The equality operators maintain the following invariants:</p>
<pre><code>A != B is equivalent to !(A == B).
A == B is equivalent to B == A, except in the order of evaluation of A and B.
</code></pre><p><strong>NOTE 3</strong> The equality operator is not always transitive. For example, there might be two distinct String objects, each representing the same String value; each String object would be considered equal to the String value by the == operator, but the two String objects would not be equal to each other. For Example:</p>
<pre><code>new String("a") == "a" and "a" == new String("a")are both true.
new String("a") == new String("a") is false.
</code></pre><p><strong>NOTE 4</strong> Comparison of Strings uses a simple equality test on sequences of code unit values. There is no attempt to use the more complex, semantically oriented definitions of character or string equality and collating order defined in the Unicode specification. Therefore Strings values that are canonically equal according to the Unicode standard could test as unequal. In effect this algorithm assumes that both Strings are already in normalised form.</p>
<p>reference: <a href="http://www.ecma-international.org/ecma-262/5.1/#sec-11.9.3" target="_blank" rel="noopener">ES5 Specification 11.9.3</a></p>
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<p>TODO</p>
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<a class="post-title-link" href="/2019/10/20/CMD-ip-command/" itemprop="url">[CMD] ip command</a></h1>
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<p>ip命令在linux下可以通过安装net-tools获得。ip（Internet Protocol）命令可以用来展示或者修改系统的路由，设备和隧道灯信息。linux下还有一个相似的命令ifconfig（deprecated），与之相比ip命令可以完成更多的功能。</p>
<p>ip命令可以用于配置修改路由设置，设置隧道，查询ip地址和其他属性信息，修改接口的状态以及添加，修改或删除ip地址和路由等。</p>
<p><strong>Syntax</strong>:</p>
<pre><code>ip [ OPTIONS ] OBJECT { COMMAND | help }
</code></pre><p><strong>Options</strong>:</p>
<ul>
<li><p>address. 查询设备上的ip信息</p>
<p> ip address<br> ip address show {interface} // 查询指定设备的地址信息</p>
</li>
<li><p>link. 展示连接层信息</p>
<p> ip link<br> ip -s link // 展示网络接口的统计信息<br> ip [-s] link show {interface}</p>
</li>
<li><p>route. 查询路由信息</p>
<p> ip route</p>
</li>
<li><p>add. 为接口添加ip地址</p>
<p> ip a add {ip_address} dev {interface}</p>
</li>
<li><p>del. 删除接口上的ip地址</p>
<p> ip a del {ip_address} dev {interface}</p>
</li>
<li><p>up. 使能网络接口</p>
<p> ip link set {interface} up</p>
</li>
<li><p>down. 关闭网络接口</p>
<p> ip link set {interface} down</p>
</li>
<li><p>monitor. 在屏幕上持续展示实时的设备，地址和路由信息</p>
<p> ip monitor</p>
</li>
<li><p>neighbor. 查看邻居的mac信息</p>
<p> ip neighbor<br> ip neighbor del {ip_address} dev {interface}<br> ip neighbor add {ip_address} dev {interface}</p>
</li>
</ul>
<p>Reference:</p>
<ul>
<li><a href="https://www.geeksforgeeks.org/ip-command-in-linux-with-examples/" target="_blank" rel="noopener">https://www.geeksforgeeks.org/ip-command-in-linux-with-examples/</a></li>
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<a class="post-title-link" href="/2019/10/15/Learning-Plan/" itemprop="url">Learning Plan</a></h1>
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<h2 id="前端学习"><a href="#前端学习" class="headerlink" title="前端学习"></a>前端学习</h2><h3 id="目标"><a href="#目标" class="headerlink" title="目标"></a>目标</h3><ul>
<li>掌握基本的js语法；</li>
<li>掌握vue框架；</li>
<li>学会搭脚手架；</li>
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<h3 id="书籍"><a href="#书籍" class="headerlink" title="书籍"></a>书籍</h3><ul>
<li><a href="https://github.com/getify/You-Dont-Know-JS/tree/1ed-zh-CN" target="_blank" rel="noopener">You dont know JS series</a> [0%]</li>
<li>Vue2 实践 [0%]</li>
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<h2 id="机器学习-amp-amp-深度学习"><a href="#机器学习-amp-amp-深度学习" class="headerlink" title="机器学习&&深度学习"></a>机器学习&&深度学习</h2><h3 id="目标-1"><a href="#目标-1" class="headerlink" title="目标"></a>目标</h3><ul>
<li>掌握基础的机器学习算法和基于scikit-learn的实现；</li>
<li>掌握深度学习的原理和基于TensorFlow的实现；</li>
<li>python3和整体流程的掌握；</li>
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<li>机器学习实战：基于Scikit-Learn和TensorFlow [0%]</li>
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<h2 id="机器学习数学基础"><a href="#机器学习数学基础" class="headerlink" title="机器学习数学基础"></a>机器学习数学基础</h2><h3 id="目标-2"><a href="#目标-2" class="headerlink" title="目标"></a>目标</h3><p>掌握机器学习的数学基础</p>
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<li>Algebra, Topology, Differential Calculus, and Optimization Theory For Computer Science and Machine Learning [0%]</li>
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<a class="post-title-link" href="/2019/09/15/ML-环境配置/" itemprop="url">[读书笔记][机器学习实战]环境配置</a></h1>
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<p>首先在本地安装好python3和pip3环境，并确保pip版本是最新的，最低要求是大于1.4（1.4版本后开始支持wheel安装）。如果本地pip版本过低，可以执行命令对pip进行升级；</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">pip3 install --upgrade pip</span><br></pre></td></tr></table></figure>
<p>强烈建议在本地使用virtualenv建立隔离环境，这样可以在本地保证库版本不冲突的情况下同时处理不同的项目。可以通过以下命令来安装virtualenv：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">pip3 install --user --upgrade virtualenv</span><br></pre></td></tr></table></figure>
<p>输入以下命令在自己的workdir中建立一个隔离的python环境：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cd $WORK_DIR</span><br><span class="line">python3 -m virtualenv env</span><br></pre></td></tr></table></figure>
<p>之后想要使用这个隔离的python环境时，只需要在终端中输入：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cd $WORK_DIR</span><br><span class="line">source env/bin/activate</span><br></pre></td></tr></table></figure>
<p>当这个环境被激活时，所有在该环境下执行的pip命令所安装的包都将被安装到这个隔离的环境中，python只拥有这些包的访问权限。如果想要在激活的隔离环境中访问系统的python软件包，需要借助virtualenv的–system-site-packages选项，具体可参考virtualenv文档。</p>
<p>接下来可以开始安装依赖的模块了。主要的模块有Jupyter，Numpy，Pandas，Matplotlib以及Scikit-learn。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">pip3 install --upgrade jupyter matplotlib numpy pandas scipy scikit-learn</span><br></pre></td></tr></table></figure>
<p>检查安装是否成功：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python -c "import jupyter, matplotlib, numpy, pandas, scipy, sklearn"</span><br></pre></td></tr></table></figure>
<p>之后你就可以在命令行中用jupyter命令启动一个notebook，默认可以通过localhost:8888 访问起的notebook。</p>
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