<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>4.setCss</title>
<style>
html,body,div{
margin: 0;
padding: 0;
}
width: 200px;
height: 200px;
background: greenyellow;
}
width: 100px;
height: 100px;
background: red;
}
</style>
</head>
<body>
<div id="parent">
<div id="box">点me</div>
</div>
<script>
var oParent=document.getElementById('parent');
var oBox=document.getElementById('box');
oBox.onclick=function(){
setCss(oParent,'width',400);
setCss(oBox,'height',600);
setCss(oParent,'position','relative');
setCss(oBox,'position','absolute');
setCss(oBox,'margin',10);
setCss(oBox,'padding',10);
setCss(oBox,'top',20);
setCss(oBox,'left',30);
};
var val;
function setCss(curEle,attr,val){
var reg=/^(width|height|margin|padding|top|right|bottom|left|font-size|opacity|float|position)$/;
if(reg.test(attr)){
if(typeof val==='number'){
val+='px';
}
}
curEle.style[attr]=val;
}
</script>
</body>
</html>
