个回答

• 慕桂英8820456

  2016-07-18 08:48:16

  <script type="text/javascript">

    function add(){

       var p1 = document.getElementById("p1");

       p1.className = "one";

    }

    function modify(){

       var p2 = document.getElementById("p2");

       p2.className = "two";

    }

  </script>

  注意大小写！

  0