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  • 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=" 20px;height: 35px;cursor: pointer;">
                </div>
                <div class="arrow_right J_arrow">
                    <img src="images/arrowr.png" style=" 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; 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{ 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{ 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({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);
        }
    
    
    
    
    
    
    });
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  • 原文地址:https://www.cnblogs.com/chenmiaosong/p/7526200.html
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