运行效果：
源代码：
1 <!DOCTYPE html>
2 <html lang="zh">
3 <head>
4 <meta charset="UTF-8">
5 <title>改变背景颜色</title>
6 </head>
7 <body>
8 <div style="margin-top: 100px;margin-left: 100px;">
9 <button type="button" onclick="ChangeBackgroundColor('red')">红</button>
10 <button type="button" onclick="ChangeBackgroundColor('blue')">蓝</button>
11 <button type="button" onclick="ChangeBackgroundColor('green')">绿</button>
12 </div>
13
14 <script type="text/javascript">
15 function ChangeBackgroundColor(new_bgcolor) {
16 document.bgColor = new_bgcolor;
17 }
18 </script>
19 </body>
20 </html>