Jquery实现图片左右自动滚动示例

代码如下:

<!DOCTYPE HTML>
<html>
<head>
<title>基于jQuery的控制左右滚动效果_自动滚动版本</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<style>

body{font-size:0.8em;letter-spacing:1px;font-family:"微软雅黑"; line-height:1.8em}
div,ul,li,ol,img{margin:0;padding:0}
h1{font-size:1em; font-weight:normal;}
h1 a{background:#CFF; padding:2px 3px; text-decoration:none;}
h1 a:hover{background:#eee; text-decoration:underline}
h2,h3{font-size:1em; font-weight:normal; color:#a40000; margin:1em auto; position:relative}
h3{color:#888; font-weight:bold}
ul,li,ol{list-style:none}

.ibox{width:850px; height:210px; background:#ddd; margin:1em auto; border:1em solid #ddd; position:relative; overflow:hidden}
.ibox .showbox{position:absolute;left:0;width:2550px; height:170px; background:#fff}
.ibox .showbox ul li{float:left;margin:7px}
.ibox .showbox ul li img{width:150px; height:150px; border:3px solid #a40000}
.ibox span{position:absolute;padding:2px 5px; background:#fff; cursor:pointer;}
.ibox span.pre{left:10px; bottom:0}
.ibox span.next{right:10px; bottom:0}
.ibox span.num{right:45%; bottom:0; background:#ddd;line-height:18px;}
.ibox span.num li{display:inline;margin:0 5px; padding:1px 5px; line-height:18px}
.ibox span.num .numcur{background:#a40000; color:#fff}
</style>
<script>
$(function(){
//@Mr.Think***变量
var $cur = 1;//初始化显示的版面
var $i = 5;//每版显示数
var $len = $('.showbox>ul>li').length;//计算列表总长度(个数)
var $pages = Math.ceil($len / $i);//计算展示版面数量
var $w = $('.ibox').width();//取得展示区外围宽度
var $showbox = $('.showbox');
var $num = $('span.num li')
var $pre = $('span.pre')
var $next = $('span.next');
var $autoFun;
//@Mr.Think***调用自动滚动
autoSlide();
//@Mr.Think***向前滚动
$pre.click(function(){
if (!$showbox.is(':animated')) { //判断展示区是否动画
if ($cur == 1) { //在第一个版面时,再向前滚动到最后一个版面
$showbox.animate({
left: '-=' + $w * ($pages - 1)
}, 500); //改变left值,切换显示版面,500(ms)为滚动时间,下同
$cur = $pages; //初始化版面为最后一个版面
}
else {
$showbox.animate({
left: '+=' + $w
}, 500); //改变left值,切换显示版面
$cur--; //版面累减
}
$num.eq($cur - 1).addClass('numcur').siblings().removeClass('numcur'); //为对应的版面数字加上高亮样式,并移除同级元素的高亮样式
}
});
//@Mr.Think***向后滚动
$next.click(function(){
if (!$showbox.is(':animated')) { //判断展示区是否动画
if ($cur == $pages) { //在最后一个版面时,再向后滚动到第一个版面
$showbox.animate({
left: 0
}, 500); //改变left值,切换显示版面,500(ms)为滚动时间,下同
$cur = 1; //初始化版面为第一个版面
}
else {
$showbox.animate({
left: '-=' + $w
}, 500);//改变left值,切换显示版面
$cur++; //版面数累加
}
$num.eq($cur - 1).addClass('numcur').siblings().removeClass('numcur'); //为对应的版面数字加上高亮样式,并移除同级元素的高亮样式
}
});
//@Mr.Think***数字点击事件
$num.click(function(){
if (!$showbox.is(':animated')) { //判断展示区是否动画
var $index = $num.index(this); //索引出当前点击在列表中的位置值
$showbox.animate({
left: '-' + ($w * $index)
}, 500); //改变left值,切换显示版面,500(ms)为滚动时间
$cur = $index + 1; //初始化版面值,这一句可避免当滚动到第三版时,点击向后按钮,出面空白版.index()取值是从0开始的,故加1
$(this).addClass('numcur').siblings().removeClass('numcur'); //为当前点击加上高亮样式,并移除同级元素的高亮样式
}
});
//@Mr.Think***停止滚动
clearFun($showbox);
clearFun($pre);
clearFun($next);
clearFun($num);
//@Mr.Think***事件划入时停止自动滚动
function clearFun(elem){
elem.hover(function(){
clearAuto();
}, function(){
autoSlide();
});
}
//@Mr.Think***自动滚动
function autoSlide(){
$next.trigger('click');
$autoFun = setTimeout(autoSlide, 4000);//此处不可使用setInterval,setInterval是重复执行传入函数,这会引起第二次划入时停止失效
}
//@Mr.Think***清除自动滚动
function clearAuto(){
clearTimeout($autoFun);
}
});
</script>
</head>

<body>
<div class="ibox">
<div class="showbox">
<ul>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/f8a9dd53720bf31b5917915e8222c27370a3681c_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/68e9a7a8476e26a1022fa5e39ccdda669a5d4f08_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/20417dfc945bae6c720a660625e9652a154c2c94_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/f4a9f29299f3dba6e7af0ac3c5aff93e01f874d3_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/ca6f0c9ac0c6e3bfce827cd92833e1db620b6377_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/809fcfbb8a1f58d1d47a760fd4283556cce201ef_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
<li><img src="http://zsrimg.ikafan.com/demoimg/201007/49d6ae8901500f473a2e3e58e5b5ddc0e788bc9d_m.jpg" alt="demo" title="demo" /></li>
</ul>
</div>
<span class="pre">«向左滚动</span>
<span class="next">向右滚动»</span>

</div>
</body>
</html>