download:贪婪学院-举荐零碎算法工程师造就打算
<html>
<head>
<meta charset="utf-8"><link rel = "stylesheet" href="mycss.css" type="text/css" /><title>测试内部css</title><script language="javascript"> function changcolor(obj){ var ocssRules = document.styleSheets[0].rules;//这里的0示意援用的第1个css文件，.rules返回所有的规定 var styleobj = ocssRules[0];//这里的0示意第1个规定 for(key in styleobj){ document.writeln(key + "=" + styleobj[key]+"<br>"); } if(obj.value == "红色"){ styleobj.style.backgroundColor="red"; }else{ styleobj.style.backgroundColor="black"; } }</script></head>
<body>
<div id = "div1" class="style">div</div><input type = "button" value="红色" nclick="changcolor(this)"><input type = "button" value="彩色" nclick="changcolor(this)"></body>
</html>
css文件为mycss.css：
.style{
width:600px;height:300px;background-color:red;}
people{
width:300px;}
.card{
width:123px;height:444px;}