<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>class优先级</title>
<style>
div{
width:100px;
height:100px;
margin:20px;
}
.lik_2{
background:green;
}
.lik_1{
background:red;
}
</style>
</head>
<body>
<div class="lik_1 lik_2"></div>
<div class="lik_2 lik_1"></div>
</body>
</html>
样式只与style中的先后顺序有关，而与body中元素的class顺序无关。
原文：http://www.cnblogs.com/likwin/p/7131629.html