<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> div { width: 300px; height: 450px; border: 1px solid red; } </style> </head> <body> <input type="button" value="變色" id="btn" /> <div id="dv"> <span>這是span</span> <p>這是p</p> <span>這是span</span> <p>這是p</p> <span>這是span</span> <p>這是p</p> <span>這是span</span> <a href="http://www.baidu.com">百度</a> </div> <script src="common.js"></script> <script type="text/javascript"> //點擊按鈕 設置p標簽變色===節點的方式做 my$("btn").onclick = function() { //先獲取div var dvObj = my$("dv"); //獲取dv里面的所有節點 var nodes = dvObj.childNodes; for (var i = 0; i < nodes.length; i++) { //判斷這個節點是不是p標簽 if (nodes[i].nodeType == 1 && nodes[i].nodeName == "P") { nodes[i].style.backgroundColor="red"; } } }; </script> </body> </html>
效果：
