js命名空間寫法示例_javascript技巧

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#div1{width: 100px;height: 100px;background: #ccc;}
#div2{width:100px;height: 20px;background: red;}
#div3{width: 300px;height: 200px;border: 1px solid #ccc;position: absolute;;margin-left: -150px;margin-top:-100px;left:50%;top: 50%;display: none;}
li{width: 100px;float: left;background: #ccc;}
.active{background: red;}
.tab_main{display: none;}
.clearfix:after{clear: both;display: table;content:'';}
.cleafix{zoom:1;}