• JS

    js获取伪类元素样式

    by on 2012年05月15日
<!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>
* { margin:0; padding:0; border:0;}
#test { width:400px; height:200px; background:#000; position:relative;}
#test:after { display:block; width:100px; height:10px; background:#eee; content:”; left:10px; position:absolute; top:0;}
</style>
</head>
<body>
<div id=”test”>test</div>
<script>
function $(id){
return typeof id === “string” ? document.getElementById(id) : id;
}
var computedstyle = document.defaultView.getComputedStyle($(‘test’),”:after”);
alert(computedstyle.left);
</script>
</body>
</html>