通过jq实现的轮播图

html代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>轮播图</title>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script>
    <script type="text/javascript" src="js/lunbo.js"></script>
</head>

<body>
    <div class="wrapper_lb">
        <div class="lb_pic_list" id="J_lb_pic">
            <div class="lb_pic_box">
                <a href="javascript:;"><img src="images/01.jpg"></a>
            </div>
            <div class="lb_pic_box">
                <a href="javascript:;"><img src="images/02.jpg"></a>
            </div>
            <div class="lb_pic_box">
                <a href="javascript:;"><img src="images/03.jpg"></a>
            </div>
            <div class="lb_pic_box">
                <a href="javascript:;"><img src="images/04.jpg"></a>
            </div>
            <div class="lb_pic_box">
                <a href="javascript:;"><img src="images/05.jpg"></a>
            </div>
            
        </div>
       
            <div class="arrow_left J_arrow">
                <img src="images/arrowl.png" style="width: 20px;height: 35px;cursor: pointer;">
            </div>
            <div class="arrow_right J_arrow">
                <img src="images/arrowr.png" style="width: 20px;height: 35px; cursor: pointer;">
            </div>
       
        <ul class="tabs">
            <li class="tab bg">1</li>
            <li class="tab">2</li>
            <li class="tab">3</li>
            <li class="tab">4</li>
            <li class="tab">5</li>
            
        </ul>
    </div>
</body>

</html>

css样式

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, img, ins, kbd, q, s, samp, small, strike, 
strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, 
tfoot, thead, tr, th, td ,textarea { margin:0; padding:0;  }
body {font-size: 14px; line-height: 1.5; font-family:'Microsoft Yahei','arial','tahoma','simsun';  color: #666; background-color: #fff }
table { border-collapse:collapse; border-spacing:0; }
em, i { font-style: normal }
h1, h2, h3, h4, h5, h6{ font-size: 100%; font-weight: normal; }
textarea,button,img,input{border:0;}
a { text-decoration: none; color: #666; }
ul, ol { list-style: none;}
:focus{ outline:none;}

.wrapper_lb{position: relative;width: 640px;height: 480px;}
.lb_pic_list .lb_pic_box{position: absolute;}
.lb_pic_list .lb_pic_box a{display: block;}
.lb_pic_list .lb_pic_box a img{width: 640px;height: 480px;display: block;}
.arrow_left{position: absolute; top:50%;margin-top: -18px; left: 10px;}
.arrow_right{position: absolute; top:50%;margin-top: -18px;right: 10px;}
.tabs{overflow: hidden;position: absolute;left: 50%;bottom: 10px;}
.tabs .tab{width: 20px;height: 20px;line-height: 20px;color: #fff; border-radius: 50%;background-color: #5388e3;
    float:left;text-align: center;margin: 0 5px;font-size: 12px;cursor: pointer;}
.tabs .bg{background-color: #f00;}
.lb_arrow{display:none;}

js

$(function() {
    var i = 0;
    var timer;
    //获取id为J_lb_pic 所有的img的数组
    var imgList = $('#J_lb_pic .lb_pic_box a img');
    //获取id为J_lb_pic 所有的img的个数
    var imgNum = imgList.length;
    $('.lb_pic_box').eq(0).show().siblings().hide();
    //自动播放图片
    showTime();

    $('.tab').hover(function() {
        //鼠标放在小圆点处触发
        i = $(this).index();
        showBg();
        clearInterval(timer);//清除轮播
    }, function(){
        //鼠标离开小圆点处触发
        showTime();
    })

    //点击向左按钮
    $('.arrow_left').click(function(){
        clearInterval(timer);
        if (i == 0) {
            i = imgNum;
        }

        i--;
        showBg();
        showTime();
    });


    //点击向右按钮
    $('.arrow_right').click(function(){
        clearInterval(timer);
        if (i == imgNum-1) {
            i = -1;
        }

        i++;
        showBg();
        showTime();
    });

    $('.wrapper_lb').hover(function(){
        $('.J_arrow').show();
    },function(){
        $('.J_arrow').hide();
    });
    //获取ul(.tab)的宽度
    var ulWidth = $('.tabs').width();
    //动态设置ul(.tab)的css样式
       $('.tabs').css({width:ulWidth,marginLeft:-(ulWidth/2)});

    function showBg() {
        $('.lb_pic_box').eq(i).fadeIn(300).siblings().fadeOut(300);
        $('.tab').eq(i).addClass('bg').siblings().removeClass('bg');
    }


    function showTime() {
        timer = setInterval(function() {
            i++;
            if (i == imgNum) {
                i = 0;
            }
            showBg();
        }, 2000);
    }






});

 

posted @ 2017-09-15 14:16  松歌  阅读(158)  评论(0)  编辑  收藏  举报