src属性替换图片， - 编程论坛

程序代码：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        </head>
        <script>
            var ImageArray=new Array("1.jpg","2.jpg","3.jpg");
            var index=0;
            function nextImage()
            {
                index++;
                if(index<ImageArray.length)
                document.images[image1].src=ImageArray[index];
                else
                {
                    index=0;
                    document.images[image1].src=ImageArray[index];
                }
            }
            function lastImage()
            {
                index--;
                if(index<0)
                index=-1;
                if(index<ImageArray.length)
                document.images[image1].src=ImageArray[index];
                else
                {
                    index=0;
                    document.images[image1].src=ImageArray[index];
                }
            }
            </script>
            <body>
                <img src="1.jpg" name="image1" id="image1"width=500 height=500>
                <a href="JavaScript:nextImage()">下一张</a>
                <a href="JavaScript:lastImage()">上一张</a>
            </body>
    </html>

点击链接没反应