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1. 使用样式表
可以通过document.styleSheets属性访问文档中可用的CSS样式表，它会返回一组对象集合，这些对象代表了与文档管理的各个样式表。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>为DOM元素设置样式</title>
<style title="core styles">
p {border: medium double green; background-color: lightgray;}
#block1 {color: white;}
table {border: thin solid red;border-collapse: collapse; margin: 5px;float: left;}
td {padding: 2px;}
</style>
<link rel="stylesheet" type="text/css" href="css/style.css" />
<style media="screen AND (min-width:500px)" type="text/css">
#block2 {color: yellow;font-style: italic;}
</style>
</head>
<body>
<p id="block1">
你承受的苦难并不比他人多太多，痛苦主要来自敏感和脆弱
</p>
<p id="block2">
一些年轻人，通过高端消费来营造自己高端收入的形象
</p>
<div id="placeholder"></div>
<script>
var placeholder = document.getElementById("placeholder");
var sheets = document.styleSheets;
for(var i= 0;i<sheets.length;i++){
var newElem = document.createElement("table");
newElem.setAttribute("border","1");
addRow(newElem,"Index",i);
addRow(newElem,"href",sheets[i].href);
addRow(newElem,"title",sheets[i].title);
addRow(newElem,"type",sheets[i].type);
addRow(newElem,"ownerNode",sheets[i].ownerNode.tagName);
placeholder.appendChild(newElem);
}
function addRow(elem,header,value){
elem.innerHTML += "<tr><td>" + header + ":</td><td>" + value + "</td></tr>";
}
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/aliezpoi/p/5782400.html
