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基于jQuery的控制左右滚动图片效果_自动滚动版本

 
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<!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');
        $autoFun = setTimeout(autoSlide, 3000);//此处不可使用setInterval,setInterval是重复执行传入函数,这会引起第二次划入时停止失效
    }
    //@Mr.Think***清除自动滚动
    function clearAuto(){
        clearTimeout($autoFun);
    }
});
</script>
</head>


<body>
<div class="ibox">
    <div class="showbox">
        <ul>
            <li><img src="http://files.jb51.net/demoimg/201007/f8a9dd53720bf31b5917915e8222c27370a3681c_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/68e9a7a8476e26a1022fa5e39ccdda669a5d4f08_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/20417dfc945bae6c720a660625e9652a154c2c94_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/f4a9f29299f3dba6e7af0ac3c5aff93e01f874d3_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/ca6f0c9ac0c6e3bfce827cd92833e1db620b6377_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/809fcfbb8a1f58d1d47a760fd4283556cce201ef_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/56d1b9aaff5b424f1cdb08b80544d5150839b4de_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/15a1d7982c49b0e638ae3340cf86dc4469f955cc_m.jpg" alt="demo" title="demo" /></li>
            <li><img src="http://files.jb51.net/demoimg/201007/49d6ae8901500f473a2e3e58e5b5ddc0e788bc9d_m.jpg" alt="demo" title="demo" /></li>
        </ul>
    </div>
        <span class="pre">&laquo;向左滚动</span>
    <span class="next">向右滚动&raquo;</span>
    <span class="num">
        <ol>
            <li class="numcur">1</li>
            <li>2</li>
            <li>3</li>
        </ol>
    </span>
</div>
</body>
</html>

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