轮播图

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图片轮播</title>
    <style>
        *{
            padding:0;margin:0;
        }
        #demo{
            position:relative;
            width:730px;
            height:454px;
            margin:100px auto;
        }
        #pic{
            width:730px;
            height:454px;

        }
        .ig{
            position: absolute;
        }
        .but{
            width:30px;
            height:54px;
            color:#fff;
            background:rgba(0,0,0,0.5);
            font-size:40px;
            text-align: center;
            line-height: 54px;
            cursor:pointer;
            position: absolute;
            top:50%;
            margin-top:-27px;
        }
        #leftBut{
            left:0;
        }
        #rightBut{
            right:0;
        }
        span{
            display: inline-block;
            width:30px;
            height:30px;
            background-color: #fff;
            color:#0f0f0f;
            cursor:pointer;
            position: relative;
            top:-50px;
            left:300px;
            text-align: center;
            line-height: 30px;
            border-radius: 50%;
        }
        .bg{
            background-color: red;
        }
    </style>
    <script src="jquery-3.0.js"></script>
</head>
<body>
    <div id="demo">
        <div id="pic">
            <img class="ig" src="img/1.jpg" alt="">
            <img class="ig" src="img/2.jpg" alt="">
            <img class="ig" src="img/3.jpg" alt="">
            <img class="ig" src="img/4.jpg" alt="">
        </div>
        <div id="leftBut" class="but">&lsaquo;</div>
        <div id="rightBut" class="but">&rsaquo;</div>
        <div id="num">
            <span class="bg">1</span>
            <span>2</span>
            <span>3</span>
            <span>4</span>
        </div>
    </div>

    <script>
        var i=0;
        var timer;
        $(function () {
            $(".ig").eq(0).show().siblings().hide();//第一张图显示，其余隐藏
            showTime();
            $("span").hover(function () {
                i=$(this).index();
                show();
                clearInterval(timer)
            },function () {
                showTime();
            });
            $("#leftBut").click(function () {
                clearInterval(timer);
                if(i==0){
                    i=4
                }
                i--;
                show();
                showTime();
            });
            $("#rightBut").click(function () {
                clearInterval(timer);
                if(i==3){
                    i=-1
                }
                i++;
                show();
                showTime();
            });
        });
        function show() {
            $(".ig").eq(i).fadeIn(300).siblings().fadeOut(300);//第i张图片显示，其余隐藏
            $("span").eq(i).addClass("bg").siblings().removeClass("bg");//数字按钮跟随图片显示样式
        }
        function showTime() {//每隔3秒，i+1，并执行show函数
            timer=setInterval(function () {
                i++;
                if(i==4){
                    i=0;
                }
                show();
            },3000);
        }
    </script>
</body>
</html>
posted on 2016-09-19 20:39 webstong 阅读(125) 评论(0) 编辑收藏举报