<body> <p id="pid">hello</p> <button onclick="demo()">按钮</button> <script> function demo(){ var nv = document.getelementbyid("pid"); nv.innerhtml="world"; } </script> </body>
修改元素标签属性：
<body> <a href="http://www.baidu.com/" id="aid" >呵呵</a> <button onclick="demo()">按钮</button> <script> function demo(){ document.getelementbyid("aid").href="http://www.jikexueyuan.com"; } </script> </body>