查询单个元素document.getElementById

示例

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <title>访问元素</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         </style>
14     </head>
15     <body>
16          <ul id="ul">
17             <li id="a">油条</li>
18             <li id="b">包子</li>
19             <li id="c">米饺</li>
20             <li id="d"><a>鱼粉</a></li>
21         </ul>
22         
23         <!--按钮 onclick当点击按钮时，执行一段JavaScript代码-->
24         <button onclick="gaibianyangshi()">点击</button>
25         
26         <script>
27         // 返回单一元素节点
28         function gaibianyangshi() {
29         /**getElementById按ID获取元素**/
30             var el = document.getElementById('a');
31             el.className='mycolor';
32         
33         }
34             
35         </script>
36     </body>
37 </html>

 

posted @ 2019-07-10 18:42  JackSon~鹤  阅读(181)  评论(0)  编辑  收藏  举报