<head>
<title></title>
<style type="text/css">
img
{
300px;height:300px;
}
a
{
text-decoration:none;
}
</style>
<script src="Jquery1.7.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('img').toggle(
function () { $('img').attr('src', 'images/2.jpg') }, function () { $('img').attr('src', 'images/3.jpg') },
function () { $('img').attr('src', 'images/1.jpg') } )
//下标是从0开始的
var arr=[1,2,3,4];
var count=1;
$('#a1').click(function(){
if(count>0){count--;}
$('img').attr('src','images/'+arr[count]+'.jpg')
})
$('#a2').click(function(){
if(count<3){count++;}
$('img').attr('src','images/'+arr[count]+'.jpg')
})
})
</script>
</head>
<body>
<span id="a1">后退</span> <img alt="" src="images/1.jpg" /><span id="a2">前进</span>
</body>
</html>