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点滴积累【JS】---JS小功能（button选择颜色)

news 来源：原创 2024/5/6 3:20:29

效果：

代码：

 1 <head runat="server">
 2     <title></title>
 3     <style type="text/css">
 4         #red
 5         {
 6             width: 260px;
 7             height: 200px;
 8             background: #FF0000;
 9             display: none;
10         }
11         #green
12         {
13             width: 260px;
14             height: 200px;
15             background: #00FF00;
16             display: none;
17         }
18         #yellow
19         {
20             width: 260px;
21             height: 200px;
22             background: #FFFF00;
23             display: none;
24         }
25         #blue
26         {
27             width: 260px;
28             height: 200px;
29             background: #0000FF;
30             display: none;
31         }
32     </style>
33     <script type="text/javascript">
34         window.onload = function () {
35             var btn = document.getElementsByTagName('input');
36             var div = document.getElementsByTagName('div');
37             for (var i = 0; i < btn.length; i++) {
38                 btn[i].index = i;
39                 btn[i].onclick = function () {
40                     for (var i = 0; i < btn.length; i++) {
41                         btn[i].style.background = '';
42                     }
43                     switch (this.value) {
44                         case '红色': this.style.background = '#FF0000';
45                             break;
46                         case '绿色': this.style.background = '#00FF00';
47                             break;
48                         case '黄色': this.style.background = '#FFFF00';
49                             break;
50                         case '蓝色': this.style.background = '#0000FF';
51                             break;
52                     }
53                     for (var i = 0; i < btn.length; i++) {
54                         div[i].style.display = '';
55                     }
56                     div[this.index].style.display = 'block';
57                 }
58             }
59         };
60     </script>
61 </head>
62 <body>
63     <input type="button" id="btn1" value="红色" style="background-color: #FF0000" />
64     <input type="button" id="btn2" value="绿色" />
65     <input type="button" id="btn3" value="黄色" />
66     <input type="button" id="btn4" value="蓝色" />
67     <div id="red" style="display: block;">
68     </div>
69     <div id="green">
70     </div>
71     <div id="yellow">
72     </div>
73     <div id="blue">
74     </div>
75 </body>