jquery如何实现走马灯特效

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话不多说，先上大致效果：

html代码：

<div class="main-box">    <div class="poker_box">      <div class="pokerCaroursel poker-content" data-setting='{        "width":1094,        "height":338,        "pokerWidth":488,        "pokerHeight":338,        "scale":0.85,        "speed": 500,        "autoPlay":true,        "delay":2000,        "verticalAlign":"middle"                }'>        <!-- 向左按钮 -->        <div class="poker-btn poker-prev-btn"></div>        <ul class="poker-list">          <!-- 图片张数最好是基数，这样呈现的画面才好看 -->          <li class="poker-item poker-rad">              <div class="item">                <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ><img class="tabImg" class="lazy" data-src="images/01.jpg"></a>                 <span class="poker-item-title">图一</span>              </div>          </li>          <li class="poker-item poker-rad">              <div class="item">                <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ><img class="tabImg" class="lazy" data-src="images/02.jpg"></a>                <span class="poker-item-title">图二</span>               </div>          </li>          <li class="poker-item poker-rad">            <div class="item">              <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ><img class="tabImg" class="lazy" data-src="images/03.jpg"></a>              <span class="poker-item-title">图三</span>            </div>          </li>        </ul>        <!-- 向右按钮 -->        <div class="poker-btn poker-next-btn"></div>      </div>    </div>  </div>

注意：

• 类名不要随意更改（否则插件里面的也要更改），替换图片地址即可。

• data-setting属性记得按照以上格式设置，不然可能报错

script代码:

<script class="lazy" data-src="jquery.js"></script><script class="lazy" data-src="jquery.pokerCarousel.js"></script><script>pokerCaroursel.init($('.pokerCaroursel'))</script>

注意：
要记得先引入jquery.js文件（可去官网下载：https://jquery.com/download/），再引入jquery.pokerCarousel.js文件

jquery.pokerCarousel.js文件完整代码：

var MIDDLE_PIC_POS = 1//计算如何用最短的距离移动到目标//由于有两种移动方式,向左边移动或者像右边移动,只需要在这两种方式中选择一个小的就行了;(function($){    var pokerCaroursel = function (caroursel){        var self = this;        this.caroursel = caroursel;        this.pokerList = caroursel.find(".poker-list");        this.pokerItems = caroursel.find(".poker-item");        this.firstpokerItem = this.pokerItems.first();        this.lastpokerItem = this.pokerItems.last();        this.prevBtn = this.caroursel.find(".poker-prev-btn");        this.nextBtn = this.caroursel.find(".poker-next-btn");        this.buttonItems = caroursel.find(".tabBtn");        //每个移动元素的位置索引,用于记录每个元素当前的位置,在每次移动的时候,该数组的值都会发生变化        //数组的下标对应li元素的位置索引        this.curPositions = [];        for(var i = 0;i<this.pokerItems.length;++i){            this.curPositions[i] = i+1;        }        this.setting = {            "width":"1106",            "height":"340",            "pokerWidth":"488",            "pokerHeight":"340",            "scale":"0.8",            "speed":"1000",            "isAutoplay":"true",            "dealy":"2000"        };        $.extend(this.setting,this.getSetting());        this.setFirstPosition();        this.setSlicePosition();        this.refreshCss();        this.rotateFlag = true;        this.prevBtn.bind("click",function(){            if(self.rotateFlag){                self.rotateFlag = false;                self.rotateAnimate("left")            }        });        this.nextBtn.bind("click",function(){            if(self.rotateFlag){                self.rotateFlag = false;                self.rotateAnimate("right")            }        });        //绑定位置按钮事件         this.buttonItems.each(function(index){             var _this = $(this);             _this.click(function(){                 self.clickPosButtonIndex(index);             })         });        if(this.setting.isAutoplay){            this.autoPlay();            this.caroursel.hover(function(){clearInterval(self.timer)},function(){self.autoPlay()})        }    };    pokerCaroursel.prototype = {        autoPlay:function(){          var that = this;          this.timer =  window.setInterval(function(){              that.nextBtn.click();          },that.setting.dealy)        },        refreshCss:function(){            var that= this;            var curFirstPos;//当前位于中间的li元素位置            this.buttonItems.each(function(index){                var _this = $(this);                var curPos = that.curPositions[index];                if(curPos == 1){                    _this.addClass('poker-btn-active');                }                else{                    _this.removeClass('poker-btn-active');                }            });        },        //记录每次移动的状态        refreshPositions:function(offset){            for(var i = 0; i < this.curPositions.length; ++i)            {                var nextPos = this.curPositions[i] + offset;                if (nextPos > this.curPositions.length) {//移动超过末尾,则位置变成到开头                    nextPos = nextPos - this.curPositions.length;                }else                  if (nextPos < 1) {向左边移动已经移动到开始位置更左边,则位置变成结束                     nextPos = this.curPositions.length + nextPos;                 }                this.curPositions[i] = nextPos;            }            //console.log('after refreshPositions',this.curPositions);            this.refreshCss();        },         cal_move_path:function(curPos,desPos,arraySize) {            if(curPos == desPos) return null;            //往左边移动             var goRightSteps;             var goLeftSteps;             var retDirect;             var retStep;             if(curPos > desPos){                 goRightSteps = curPos - desPos;                 goLeftSteps = desPos + (arraySize - curPos);                 retDirect = (goRightSteps <= goLeftSteps) ? "left":"right";                 return {"direct":retDirect,"step":Math.min(goLeftSteps,goRightSteps)};             }        },        //点击位置按钮,根据点击的按钮索引 决定向左还是向右移动[因为只有三个位置,该方法能够仅靠向左或向右就能将        //指定的位置移动到中间]        clickPosButtonIndex:function(index){            var self = this;            if(self.rotateFlag == false) {//目前正在移动等移动结束后才能进入                return;            }            var curPos = this.curPositions[index];            var retPath = this.cal_move_path(curPos,MIDDLE_PIC_POS,this.curPositions.length);            if (retPath == null){                return;            }            var direct = retPath.direct;            var step = retPath.step;            self.rotateFlag = false;            self.rotateAnimate(direct,step)        },        rotateAnimate:function(type,step){            step = step || 1;            var that = this;            var zIndexArr = [];            var speed = that.setting.speed;                this.pokerItems.each(function(){                   var self = $(this);                   var destPic = null;                   var curPic = self;                   for (var i = 0; i < step;++i){                        if(type == "left"){// 向左边移动, 下一张图片在自己的右边,所以用next()                            destPic = curPic.next().get(0)?curPic.next():that.firstpokerItem;                        }                        else{                            destPic = curPic.prev().get(0)?curPic.prev():that.lastpokerItem;                        }                        curPic = destPic;                    }                    var width = destPic.css("width");                    var height = destPic.css("height");                    var zIndex = destPic.css("zIndex");                    var opacity = destPic.css("opacity");                    var left = destPic.css("left");                    var top = destPic.css("top");                    zIndexArr.push(zIndex);                    self.animate({                        "width":width,                        "height":height,                        "left":left,                        "opacity":opacity,                        "top":top                    },speed,function(){                        that.rotateFlag = true;                    });                });                this.pokerItems.each(function(i){                    $(this).css("zIndex",zIndexArr[i]);                });                if (type == 'right'){                    this.refreshPositions(-step);                }else{                    this.refreshPositions(step);                }        },        setFirstPosition:function(){            this.caroursel.css({"width":this.setting.width,"height":this.setting.height});            this.pokerList.css({"width":this.setting.width,"height":this.setting.height});            var width = (this.setting.width - this.setting.pokerWidth) / 2;            console.log(this.pokerItems.length)            this.prevBtn.css({"width":width , "height":this.setting.height,"zIndex":Math.ceil(this.pokerItems.length/2)});            this.nextBtn.css({"width":width , "height":this.setting.height,"zIndex":Math.ceil(this.pokerItems.length/2)});            this.firstpokerItem.css({                "width":this.setting.pokerWidth,                "height":this.setting.pokerHeight,                "left":width,                "zIndex":Math.ceil(this.pokerItems.length/2),                "top":this.setVertialType(this.setting.pokerHeight)            });        },        setSlicePosition:function(){            var _self = this;            var sliceItems = this.pokerItems.slice(1),                level = Math.floor(this.pokerItems.length/2),                leftItems = sliceItems.slice(0,level),                rightItems = sliceItems.slice(level),                pokerWidth = this.setting.pokerWidth,                pokerHeight = this.setting.pokerHeight,                Btnwidth = (this.setting.width - this.setting.pokerWidth) / 2,                gap = Btnwidth/level,                containerWidth = this.setting.width;            var i = 1;            var leftWidth = pokerWidth;            var leftHeight = pokerHeight;            var zLoop1 = level;            leftItems.each(function(index,item){                var scale = _self.setting.scale;                if(index==1){                    scale = scale*scale;                }                leftWidth = pokerWidth * scale;                leftHeight = pokerHeight*scale;                $(this).css({                    "width":leftWidth,                    "height":leftHeight,                    "left": Btnwidth - i*gap,                    "zIndex":zLoop1--,                    "opacity":2/(i+1),                    "top":_self.setVertialType(leftHeight)                });                i++;            });            var j = level;            var zLoop2 = 1;            var rightWidth = pokerWidth;            var rightHeight = pokerHeight;            rightItems.each(function(index,item){                var scale = _self.setting.scale;                if(index==0){                    scale = scale*scale;                }                var rightWidth = pokerWidth * scale;                var rightHeight = pokerHeight*scale;                $(this).css({                    "width":rightWidth,                    "height":rightHeight,                    "left": containerWidth -( Btnwidth - j*gap + rightWidth),                    "zIndex":zLoop2++,                    "opacity":2/(j+1),                    "top":_self.setVertialType(rightHeight)                });                j--;            });        },        getSetting:function(){            var settting = this.caroursel.attr("data-setting");            if(settting.length > 0){                return $.parseJSON(settting);            }else{                return {};            }        },        setVertialType:function(height){            var align = this.setting.align;            if(align == "top") {                return 0            }else if(align == "middle"){                return (this.setting.pokerHeight - height) / 2            }else if(align == "bottom"){                return this.setting.pokerHeight - height            }else {                return (this.setting.pokerHeight - height) / 2            }        }    };    pokerCaroursel.init = function (caroursels){        caroursels.each(function(index,item){            new pokerCaroursel($(this));        })  ;    };    window["pokerCaroursel"] = pokerCaroursel;})(jQuery);// JavaScript Document

css代码：

.main-box{ height: 352px; width:1118px;position: absolute;top: 122px;left: 32px;}.poker_box h3 {font-size: 30px;color: #015293;font-weight: bold;text-align: center;}.poker_box h4 {font-size: 16px;color: #015293;margin: 10px 0 35px;text-align: center;}.poker-content {width: 1129px;position: relative;width: 100%;height: 350px!important;margin-left: auto;margin-right: auto;}.poker-content img {display: block;box-shadow: 0px 0px 10px #222222;-webkit-box-shadow: 0px 0px 10px #222222;border: 0;}.poker-content a, .poker-content img {display: block;width: 100%;height: 100%;border: none;}img {border: none;display: block;}.poker-content .poker-list {width: 1118px;height: 500px;}.poker-content .poker-list .poker-item {width: 200px;height: 350px;position: absolute;left: 0;top: 0;}.poker-rad{  border-radius: 20px;  overflow: hidden;}.poker-rai{  border-radius: 20px;  overflow: hidden;}.poker-content .poker-list .poker-item .item {position: relative;width: 100%;height: 100%;}.poker-content .poker-btn {position: absolute;top: 0;cursor: pointer;filter: opacity(.5) brightness(1);}.poker-content .poker-btn:hover {filter: opacity(1) brightness(2);}.poker-content .poker-prev-btn {left: 0;}.poker-content .poker-next-btn {right: 0;}.poker-item-title {background:rgba(42, 42, 42, 0.8) none repeat scroll 0 0 !important;filter:Alpha(opacity=80); background:#2a2a2a;text-align: center;color: #FFF;width: 100%;height: 52px;line-height: 52px;position: absolute;bottom: 0;text-indent: 29px}

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