1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
5 <title>鼠标经过时换一张图片</title>
6 <meta name="keywords" content="关键字列表" />
7 <meta name="description" content="网页描述" />
8 <link rel="stylesheet" type="text/css" href="" />
9 <style type="text/css">
10 </style>
11 </head>
12 <body>
13 <form>
14 <input type="button" onclick="myfunction()" value="调用函数">
15 </form>
16
17
18 <img src='jd1.png' id='changeImage'>
19 <script type="text/javascript">
20 //定义一个变量ig，把对象‘document’的值赋值给它，通过‘getElementById’方法获取‘changeImage’属性值
21 var ig = document.getElementById('changeImage');
22 //给ig变量添加一个onmouseover事件，当鼠标移到上面就会变换一张图片
23 ig.onmouseover = function(){
24 //当鼠标移上时，ig变量的src属性值改为'jd2.png'
25 ig.src='jd2.png'
26 }
27 ig.onmouseout = function(){
28 ig.src='jd1.png'
29 }
30 function myfunction()
31 {
32 alert("调用函数以输出该提示窗口")
33 }
34 </script>
35 </body>
36 </html>
