<!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" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
#demo{
100px;
height:100px;
background-color: pink;
border:1px solid black;
position:absolute;
top:50px;
left:100px;
opacity:0.4;
}
</style>
</head>
<body>
<div id="demo"></div>
</body>
</html>
<script>
var demo=document.getElementById("demo");
function getStyle(obj,attr) //返回谁的，哪个属性
{
if(obj.currrentStyle)
{
return obj.currentStyle[attr];
}
else{
return window.getComputedStyle(obj,null)[attr]; //w3c浏览器
}
}
console.log(getStyle(demo,"width"));
console.log(getStyle(demo,"border"));
console.log(getStyle(demo,"position"));
console.log(getStyle(demo,"opacity"));
</script>