<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{text-align: center}
input{margin-top:30px;padding:10px;}
#div1{width:500px;height:300px;background:red;margin:10px auto;}
</style>
</head>
<body>
<input type="button" value="style" id="btn">
<div id="div1"></div>
<script>
//获取非行间样式
function getStyle(obj,attr){ //获取非行间样式，obj是对象，attr是值
if(obj.currentStyle){ //针对ie 获取非行间样式
return obj.currentStyle[attr];
}else{
return getComputedStyle(obj,false)[attr]; //针对非ie
}
}
//为对象写入/获取css样式
function css(obj,attr,value){ //对象，样式，值。传2个参数为获取样式，3个是设置样式
if(arguments.length==2){
return getStyle(obj,attr);
}else{
if(arguments.length==3){
obj.style[attr]=value;
}
}
}
window.onload=function(){
var oDiv=document.getElementById("div1");
var oBtn=document.getElementById("btn");
oBtn.onclick=function(){
alert(getStyle(oDiv,"height"));
css(oDiv,"background","green");
alert(css(oDiv,"width"));
}
}
</script>
</body>
</html>
