<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>新建网页</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="布尔教育 http://www.itbool.com" />
<style>
div{
width:300px;
height:300px;
border-bottom:1px solid black;
}
.test1{
background: green;
}
.test2{
width: 300px;
height: 300px;
background: red;
}
</style>
<script>
//封装一个函数，返回运算后的值！获取css样式currentStyle，getComputedStyle
function getstyle(obj , attr){
return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj , null)[attr];
}
function t() {
var div = document.getElementsByTagName('div')[0];
if(div.className.indexOf('test1') >= 0){
div.className = 'test2';
}else{
div.className = 'test1';
}
//alert(getstyle(div , 'width'));
//return;//返回
div.style.width = parseInt(getstyle(div , 'width')) + 5 + 'px';
div.style.height = parseInt(getstyle(div , 'height')) + 5 + 'px';
div.style.borderBottomWidth = parseInt(getstyle(div , 'borderBottomWidth')) + 1 + 'px';
}
</script>
</head>
<body>
<div onclick="t()";>
点击div，使其背景色红绿交替
宽高增加5px；
下边框增粗1px；
</div>
</body>
</html>
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这是我的微信扫一扫
