src属性替换图片，
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
