按元素标签查询多个 getElementsByTagName

示例

 

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <title>按元素标签查询</title>
 5         <meta charset="UTF-8">
 6         <!--<meta name="viewport" content="width=device-width, initial-scale=1.0"> -->
 7         <meta name="viewport" content="width=device-width, initial-scale=1.0">
 8         <style>
 9             .mycolor{
10                 color:#fff;
11                 background-color: #ddd;
12             }
13             .steam{
14              text-decoration:initial;
15             }
16         </style>
17     </head>
18     <body>
19          <ul id="ul">
20             <li id="a">油条</li>
21             <li id="b" class="steam">包子</li>
22             <li id="c" class="steam">米饺</li>
23             <li id="d"><a>鱼粉</a></li>
24         </ul>
25         
26         <!--按钮 onclick当点击按钮时，执行一段JavaScript代码-->
27         <button onclick="gaibianyangshi()">点击</button>
28         
29         <script>
30         // 返回单一元素节点
31         function gaibianyangshi() {
32         /**getElementsByTagName按元素标签查询**/
33             var el = document.getElementsByTagName('li');
34             for(var i=0;i<el.length;i++){
35               el[i].className="mycolor";
36             }
37         
38         }
39             
40         </script>
41     </body>
42 </html>

 

posted @ 2019-07-10 19:19  JackSon~鹤  阅读(815)  评论(0)  编辑  收藏  举报