好了废话不多说了，先看看效果图。
HTML部分：
<div> <div> <ul> <li><a href="javascript:;"><img src="https://www.jb51.net/img/1.jpg"/></a></li> <li><a href="javascript:;"><img src="https://www.jb51.net/img/2.jpg"/></a></li> <li><a href="javascript:;"><img src="https://www.jb51.net/img/3.jpg"/></a></li> <li><a href="javascript:;"><img src="https://www.jb51.net/img/4.jpg"/></a></li> <li><a href="javascript:;"><img src="https://www.jb51.net/img/5.jpg"/></a></li> <li><a href="javascript:;"><img src="https://www.jb51.net/img/6.jpg"/></a></li> </ul> </div> <div></div> <div><img src="https://www.jb51.net/img/btn_l.png"/></div> <div><img src="https://www.jb51.net/img/btn_r.png"/></div> </div> <script src="https://www.jb51.net/js/jquery-1.11.3.js"></script> <script src="https://www.jb51.net/js/slider.js"></script> <script> $('.slider').slider({ width : 640, height : 270, during : 2000, //动画执行间隔 speed : 500, //动画速度 btnSize : 20, //底部遮罩层的按钮大小 btnSpace : 10, //底部的按钮间隙 direction : 1 //轮播方向默认为1，图片向左移动 }); </script>
CSS部分：
*{ margin: 0; padding: 0; box-sizing: border-box; } .slider{ position: relative; overflow: hidden; } .slider ul{ list-style: none; float: left; } .slider ul li{ float: left; } .slider .mask{ position: absolute; bottom: 0; width: 100%; background-color: rgba(0, 0, 0, .3); } .slider .mask .sliderBtn{ position: absolute; border-radius: 50%; background-color: #fff; cursor: pointer; background: radial-gradient(white 20%, transparent 50%); } .slider .prev, .slider .next{ position: absolute; width: 45px; height: 100%; background-color: rgba(0, 0, 0, .2); cursor: pointer; top: 0; display: none; } .slider .prev{ left: 0; } .slider .next{ right: 0; } .slider .prev img, .slider .next img{ position: absolute; top: 50%; left: 50%; margin-top: -22.5px; margin-left: -22.5px; }
JS部分：
(function ($) { $.fn.slider = function (setting) { //给jQuery的实例对象绑定一个slider方法 var defaultSetting = { width : 640, height : 270, during : 3000, speed : 500, btnSize : 30, btnSpace : 10, direction : 1 } setting = $.extend(true, {}, defaultSetting, setting); //用传入的参数替换掉默认的设置 return this.each(function (i, item) { var _setInterval = window.setInterval; window.setInterval = function (callback, timer, param) { //重写setInterval函数，让其可以传参 var args = Array.prototype.slice.call(arguments, 2); var _fn = function () { callback.apply(null, args); } return _setInterval(_fn, timer); } var _this = $(this), ulBox = $('.ul-box', this), ul = $('ul', this), li = $('li', ul), img = $('img', li), len = li.size(), mask = $('.mask', this), index = 0, //用来控制按钮的下标 flag = true, //标识动画是否执行完成 gap, //执行动画的按钮下标和当前按钮的下标的差 timer; //计时器 _this.width(setting.width).height(setting.height); ulBox.width(setting.width * 3 * len).height(setting.height).css({ marginLeft: -setting.width * len }); ul.width(setting.width * len).height(setting.height); img.width(setting.width).height(setting.height); mask.height(setting.btnSize + 2 * setting.btnSpace); //添加btn for(var i = 0, str = ''; i < len; i++){ str += '<div></div>'; } mask.html(str); var ulFir = ul.clone(true); var ulSec = ul.clone(true); var sliderBtn = $('.sliderBtn', '.mask'); ulBox.append(ulFir); ulBox.append(ulSec); sliderBtn.each(function (i, item) { $(item).css({ width : setting.btnSize, height : setting.btnSize, top : setting.btnSpace, left : parseInt(setting.width - (setting.btnSize + setting.btnSpace *2) *len, 10) /2 + setting.btnSize * i + setting.btnSpace * i * 2 + setting.btnSpace }); $(item).mouseenter(function () { gap = Math.abs(i - index); i > index ? (flag && ani(1, gap)) : (flag && ani(0, gap)); }) }); btnAni(0); //按钮样式变化 function btnAni (index) { $('.sliderBtn').css('background', 'radial-gradient(white 20%, transparent 50%)'); $('.sliderBtn').eq(index).css('background', 'radial-gradient(white 10%, transparent 30%, white 70%)'); } //动画 function ani (direction, num) { if(flag){ //默认1向左运动，0向右运动 flag = false; var ulfir = $('ul', ulBox).eq(0); var left = parseInt(ulfir.css('margin-left'), 10); if(direction){ index += num; index = index % len; left = left - num * setting.width; ulfir.animate({ marginLeft: left }, setting.speed, function () { if(left <= -len * setting.width){ ulfir = ulfir.remove(); ulfir.css('margin-left', 0); ulBox.append(ulfir); } flag = true; }); }else{ index -= num; index = index <= -1 ? len - 1 : index; left = left + num * setting.width; ulfir.animate({ marginLeft: left }, setting.speed, function () { if(left >= len * setting.width){ var ulLast = $('ul', ulBox).eq(2).remove(); ulLast.css('margin-left', 0); ulBox.prepend(ulLast); ulfir.css('margin-left', 0); } flag = true }) } btnAni(index) } } //定时器 timer = setInterval(ani, setting.during, setting.direction, 1); _this.hover(function () { $('.prev', this).css('display', 'block'); $('.next', this).css('display', 'block'); clearInterval(timer); }, function () { $('.prev', this).css('display', 'none'); $('.next', this).css('display', 'none'); timer = setInterval(ani, setting.during, setting.direction, 1); }) $('.next').click(function () { flag && ani(1, 1); }) $('.prev').click(function () { flag && ani(0, 1); }) }) } })(jQuery)
以上就是差不多所有的代码了，一些比较关键的地方已经用注释好了，这里就不再叙述。
源码下载：https://github.com/wwervin72/jQuery/tree/master/slider-2
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