js类操作

类操作

1. 设置类

   <style>    #box{        width: 100px;        height: 100px;        border: 1px solid #000;    }    .bgc{        background-color: red;    }</style><div id="box"></div>var dv = document.getElementById("box");dv.className = "bgc";var cls = dv.className;