<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
div{width:100px;height:100px;border:1px solid #333;}
</style>
</head>
<body>
<div id="div1" >123</div>
<input id="btn1" type="button" value="按钮" />
<script>
var oDiv=document.getElementById(‘div1‘);
var oBtn=document.getElementById(‘btn1‘);
oDiv.onclick=function(){
// oDiv.style.width=‘200px‘;
oDiv.style.cssText=‘width: 200px;height:200px;‘;
}
oBtn.onclick=function(){
oDiv.style.cssText="width: 100px;";
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/xuling123/p/6914315.html