原生的JavaScript获取写在标签内部的样式很简单：
<div class="test" id="test" style="width:100px;">test</div>
<script type="text/javascript">
window.onload=function(){
var oTest=document.getElementById("test");
alert(oTest.style.width); //100px }
</script>
对于外部样式 与 嵌入式样式，JavaScript通过style.width没有办法获取到宽度，解决办法：
<!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>无标题文档</title>
<style type="text/css">
.test{ width:100px; height:100px; border:5px solid #ddd; padding:20px; font-family:Arial, Helvetica, sans-serif; font-size:24px;}
</style> <script type="text/javascript">
window.onload=function(){
var oTest=document.getElementById("test");
/*var styleInfo=window.getComputedStyle ?window.getComputedStyle(oTest,null):window.currentStyle;*/ function getStyle(ele,name){
var styleInfo;
if(window.getComputedStyle){ //非ie
styleInfo=window.getComputedStyle(ele,false)[name];
}else{ //ie opera
styleInfo=window.currentStyle[name];
}
return styleInfo;
}
alert(getStyle(oTest,"width")); }
</script>
</head> <body>
<div class="test" id="test" style="">test</div>
</body>
</html>
相关连接：