web/changebgColor.html at master · NitefullSand/web · GitHub

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> </title>
</head>

<body>
请输入颜色编码：
<input id="form" type="text" name="color" />
<input type="button" value="修改颜色" onclick="change()" />
<input type="button" value="自动修改颜色" onclick="autoChangeColor()" />
<script language="javascript">
function change()
{
	/*未输入颜色编码，弹出提示框*/
	if(form.value=="")
	alert("你喜欢的颜色是?：");
	/*按照输入颜色编码修改背景颜色*/
	else
	{
		document.bgColor=("" +form.value+"");
	}
}
var r=0,g=0,b=0;
function autoChangeColor()
{
	r = Math.random()*255;
	g = Math.random()*255;
	b = Math.random()*255;
	document.bgColor=(""+ r +""+ g +""+ b +"");
	setTimeout("autoChangeColor()",1000);
}
</script>

<canvas id="myCanvas" width="1024" height="768" color="blue"/>
/*对比颜色块*/
/*设置对比颜色块*/
<script type="text/javascript">
	var c =document.getElementById("myCanvas");
	var cxt=c.getContext("2d");
	cxt.fillStyle="green";
	cxt.fillRect(0,0,150,75);
</script>
</body>
</html>