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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>演示css中的选择器优先级</title>
<style>
div{width:200px;height:200px;background-color:red;}
.box2{background-color:pink;}
#box1{background-color:blue;}
</style>
</head>
<body>
<div id="box1" class="box2" >
我是一个盒子
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例