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js变换显示图片的实例

　　本文标签：js,变换,图片

开始界面如图：

复制代码 代码如下:

<head>
    <title></title>
   <script type="text/javascript">
       function UpdateImg() {
           //document.getElementById(img1).setAttribute(src, images/2.jpg);
           var dogandcat = document.getElementsByName(dogandcat); //获取所有name=dogandcat的单选按钮
           for (var i = 0; i < dogandcat.length; i++) {
               if (dogandcat[i].checked == true) {
                   var value = dogandcat[i].getAttribute(value);
                   switch (value) {
                       case 2:
                           document.getElementById(img1).setAttribute(src, images/2.jpg);
                           break;
                       case 3:
                           document.getElementById(img1).setAttribute(src, images/3.jpg);
                           break;
                       case 4:
                           document.getElementById(img1).setAttribute(src, images/4.jpg);
                           break;
                       case 6:
                           document.getElementById(img1).setAttribute(src, images/6.jpg);
                           break;
                   }
               }
           }
       }
    </script>

</head>
<body>
 <img id="img1" src="images/9.jpg" width="200px" height="200px" />
    <br />
    <input type="button"  value="改变图片" onclick="UpdateImg();" />
    <br />
    <input id="Radio1" name="dogandcat" type="radio" value="2" onclick="UpdateImg();"  />忧伤的小狗
    <input id="Radio2" name="dogandcat" type="radio" value="3" onclick="UpdateImg();"/>卖萌的小狗
    <input id="Radio3" name="dogandcat" type="radio" value="4" onclick="UpdateImg();"/>愤怒的小狗
    <input id="Radio4" name="dogandcat" type="radio" value="6" onclick="UpdateImg();"/>可爱的小猫
</body>

下面是程序运行时的界面：点击不同的按钮图片是不一样的