图片轮播相信很多人你也见过，各网站上基本上都有，那么究竟是怎么实现的呢？不废话，直接上代码：

<div id="banner_tabs" class="flexslider">
<ul class="slides">
<li>
<a title="" target="_blank" href="#">
<img width="1920" height="482" alt="" style="background: url(images/banner1.jpg) no-repeat center;" src="images/alpha.png">
</a>
</li>
<li>
<a title="" href="#">
<img width="1920" height="482" alt="" style="background: url(images/banner2.jpg) no-repeat center;" src="images/alpha.png">
</a>
</li>
<li>
<a title="" href="#">
<img width="1920" height="482" alt="" style="background: url(images/banner3.jpg) no-repeat center;" src="images/alpha.png">
</a>
</li>
</ul>
<ul class="flex-direction-nav">
<li><a class="flex-prev" href="javascript:;">Previous</a></li>
<li><a class="flex-next" href="javascript:;">Next</a></li>
</ul>
<ol id="bannerCtrl" class="flex-control-nav flex-control-paging">
<li><a>1</a></li>
<li><a>2</a></li>
<li><a>2</a></li>
</ol>
</div>

首先咱得先把图片放进去，css样式我这里就不写了，主要说的js控制图片自动轮播，也可以通过左右两边的按钮实现图片的轮换
不废话，上代码：

<script src="js/jquery.js"></script>
<script src="js/slider.js"></script>
<script type="text/javascript">
$(function() {
var bannerSlider = new Slider($('#banner_tabs'), {
time: 5000,
delay: 400,
event: 'hover',
auto: true,
mode: 'fade',
controller: $('#bannerCtrl'),
activeControllerCls: 'active'
});
$('#banner_tabs .flex-prev').click(function() {
bannerSlider.prev()
});
$('#banner_tabs .flex-next').click(function() {
bannerSlider.next()
});
})
</script>

slider部分代码：

$(function ($, window, document, undefined) {
     
    Slider = function (container, options) {
        "use strict"; 
        if (!container) return;
        var options = options || {},
            currentIndex = 0,
            cls = options.activeControllerCls,
            delay = options.delay,
            isAuto = options.auto,
            controller = options.controller,
            event = options.event,
            interval,
            slidesWrapper = container.children().first(),
            slides = slidesWrapper.children(),
            length = slides.length,
            childWidth = container.width(),
            totalWidth = childWidth * slides.length;
        function init() {
            var controlItem = controller.children();
            mode();
            event == 'hover' ? controlItem.mouseover(function () {
                stop();
                var index = $(this).index();
                play(index, options.mode);
            }).mouseout(function () {
                isAuto && autoPlay();
            }) : controlItem.click(function () {
                stop();
                var index = $(this).index();
                play(index, options.mode);
                isAuto && autoPlay();
            });
            isAuto && autoPlay();
        }
        function mode() {
            var wrapper = container.children().first();
            options.mode == 'slide' ? wrapper.width(totalWidth) : wrapper.children().css({
                'position': 'absolute',
                'left': 0,
                'top': 0
            })
                .first().siblings().hide();
        }
        function autoPlay() {
            interval = setInterval(function () {
                triggerPlay(currentIndex);
            }, options.time);
        }
        function triggerPlay(cIndex) {
            var index;
            (cIndex == length - 1) ? index = 0 : index = cIndex + 1;
            play(index, options.mode);
        }
        function play(index, mode) {
            slidesWrapper.stop(true, true);
            slides.stop(true, true);
            mode == 'slide' ? (function () {
                if (index > currentIndex) {
                    slidesWrapper.animate({
                        left: '-=' + Math.abs(index - currentIndex) * childWidth + 'px'
                    }, delay);
                } else if (index < currentIndex) {
                    slidesWrapper.animate({
                        left: '+=' + Math.abs(index - currentIndex) * childWidth + 'px'
                    }, delay);
                } else {
                    return;
                }
            })() : (function () {
                if (slidesWrapper.children(':visible').index() == index) return;
                slidesWrapper.children().fadeOut(delay).eq(index).fadeIn(delay);
            })();
            try {
                controller.children('.' + cls).removeClass(cls);
                controller.children().eq(index).addClass(cls);
            } catch (e) { }
            currentIndex = index;
            options.exchangeEnd && typeof options.exchangeEnd == 'function' && options.exchangeEnd.call(this, currentIndex);
        }
        function stop() {
            clearInterval(interval);
        }
        function prev() {
            stop();
            currentIndex == 0 ? triggerPlay(length - 2) : triggerPlay(currentIndex - 2);
            isAuto && autoPlay();
        }
        function next() {
            stop();
            currentIndex == length - 1 ? triggerPlay(-1) : triggerPlay(currentIndex);
            isAuto && autoPlay();
        }
        init();
        return {
            prev: function () {
                prev();
            },
            next: function () {
                next();
            }
        }
    };
}(jQuery, window, document));