特效左右滑动轮播图jQuery思路

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        * {
            padding: 0;
            margin: 0;
            list-style: none;
            border: 0;
        }

        .all {
             500px;
            height: 200px;
            padding: 7px;
            border: 1px solid #ccc;
            margin: 100px auto;
            position: relative;
        }

        .screen {
             500px;
            height: 200px;
            overflow: hidden;
            position: relative;
        }

        .screen li {
             500px;
            height: 200px;
            overflow: hidden;
            float: left;
        }

        .screen ul {
            position: absolute;
            left: 0;
            top: 0px;
             3000px;

        }

        .all ol {
            position: absolute;
            right: 10px;
            bottom: 10px;
            line-height: 20px;
            text-align: center;
        }

        .all ol li {
            float: left;
             20px;
            height: 20px;
            background: #fff;
            border: 1px solid #ccc;
            margin-left: 10px;
            cursor: pointer;
        }

        .all ol li.current {
            background: yellow;
        }

        #arr {
            display: none;
        }

        #arr span {
             40px;
            height: 40px;
            position: absolute;
            left: 5px;
            top: 50%;
            margin-top: -20px;
            background: #000;
            cursor: pointer;
            line-height: 40px;
            text-align: center;
            font-weight: bold;
            font-family: '黑体';
            font-size: 30px;
            color: #fff;
            opacity: 0.3;
            border: 1px solid #fff;
        }

        #arr #right {
            right: 5px;
            left: auto;
        }
    </style>
</head>
<body>
<div class="all" id='box'>
    <div class="screen">
        <ul>
            <li><img src="images/1.jpg" width="500" height="200"/></li>
            <li><img src="images/2.jpg" width="500" height="200"/></li>
            <li><img src="images/3.jpg" width="500" height="200"/></li>
            <li><img src="images/4.jpg" width="500" height="200"/></li>
            <li><img src="images/5.jpg" width="500" height="200"/></li>
        </ul>
        <ol>
            <li class="current">1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ol>
    </div>
    <div id="arr"><span id="left">&lt;</span><span id="right">&gt;</span></div>
</div>
<script src="jquery-1.12.2.js"></script>
<script>
    $(function(){
         var n=0;
         var $li=$(".screen ul li"); //声明变量减少服务器的请求次数
         var $ul=$(".screen ul");
         var $oli=$(".screen ol li");
         var $arr=$("#arr");
         var imgWidth=$li.width();
         // var timer=null;
         //克隆第一个图片
         var oLi=$li.eq(0).clone(true);
         //把克隆的图片加到ul后面
         $ul.append(oLi);
         var size=$li.size(); //获取li的个数
         // console.log(size);
         //滑过数字小图标大图跟着动
         $oli.mouseenter(function(){
            n=$(this).index();
            tab();
         })
         //点击右箭头移动轮播图
         $("#box #arr #right").click(function(){
            toRight();         
         })
         //点击左箭头移动轮播图
         $("#box #arr #left").click(function(){
            toLeft();    
         })

         //指到盒子上左右箭头出现  离开隐藏
         $("#box").hover(function(){
            $arr.css("display","block");
            clearInterval(timer);
         },function(){
            $arr.css("display","none");
            autoPlay();
         })
         //自动轮播
         autoPlay();
         function autoPlay(){
            timer=setInterval(function(){
                toRight();
            },1500)
         }
         //封装左箭头
         function toLeft(){
            n--;
            if(n<0){
                
                $ul.css("left",-size*imgWidth+"px");
                n=size-1;
            }
            tab();
         };
         //封装右箭头
         function toRight(){
            n++;
            if(n>size){
                n=1;
                $ul.css("left",0);
            }
            if(n==size){
                $oli.eq(0).addClass("current").siblings().removeClass("current");
            }
            tab();
         }
         //封装移动动画
         function tab(){
            $ul.stop().animate({left:-imgWidth*n+"px"},200);
            $oli.eq(n).addClass("current").siblings().removeClass("current");
         }
    })
</script>
</body>
</html>
特效 左右滑动轮播图jQuery思路

特效左右滑动轮播图jQuery思路
