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前端开发JS左右轮播图和淡入淡出轮播图

2018-08-09 20:36:04 分类：JavaScript 阅读(177) 评论(0)

界面设计与前端开发|前端开发语言占比|前端开发笔试经验

html 代码

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
    <meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
    <title>无缝轮播</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            list-style: none;
        }
        .banner {
            margin: 100px auto;
            width: 730px;
            height: 454px;
            overflow: hidden;
            position: relative;
        }
        .banner .img {
            width: 5000px;
            position: absolute;
            left: 0px;
            top: 0;
        }
        .banner .img li {
            float: left;
        }
        .banner .num {
            position: absolute;
            width: 100%;
            bottom: 10px;
            left: 0;
            text-align: center;
            font-size: 0px;
        }
        .banner .num li {
            width: 10px;
            height: 10px;
            background: #888;
            border-radius: 50%;
            display: inline-block;
            margin: 0 3px;
            cursor: pointer;
        }
        .banner .num li.on {
            background: #F60;
        }
        .banner .btn {
            width: 30px;
            height: 50px;
            background: rgba(0, 0, 0, 0.5);
            position: absolute;
            top: 50%;
            margin-top: -25px;
            cursor: pointer;
            text-align: center;
            line-height: 50px;
            color: #fff;
            font-size: 40px;
            font-family: “宋体”;
            display: none;
        }
        .banner:hover .btn {
            display: block;
        }
        .banner .btn_l {
            left: 0;
        }
        .banner .btn_r {
            right: 0;
        }
    </style>
    <script type=”text/javascript” src=”http://libs.baidu.com/jquery/1.11.1/jquery.min.js”></script>
    <script type=”text/javascript”>
        $(function () {
            var i = 0;
            var clone = $(“.banner .img li”).first().clone();
            $(“.banner .img”).append(clone);
            var size = $(“.banner .img li”).size();
            for (var j = 0; j < size – 1; j++) {
                $(“.banner .num”).append(“<li></li>”);
            }
            $(“.banner .num li”).first().addClass(“on”);
            /*鼠标划入圆点*/
            $(“.banner .num li”).click(function () {
                var index = $(this).index();
                i = index;
                $(“.banner .img”).stop().animate({ left: -index * 730 }, 500)
                $(this).addClass(“on”).siblings().removeClass(“on”)
            })
            /*自动轮播*/
            var t = setInterval(function () {
                i++;
                move()
            }, 3000)
            /*对banner定时器的操作*/
            $(“.banner”).hover(function () {
                clearInterval(t);
            }, function () {
                t = setInterval(function () {
                    i++;
                    move()
                }, 3000)
            })
            /*向右的按钮*/
            $(“.banner .btn_r”).click(function () {
                i++
                move();
            })
            /*向左的按钮*/
            $(“.banner .btn_l”).click(function () {
                i–
                move()
            })
            function move() {
                if (i == size) {
                    $(“.banner .img”).css({ left: 0 })
                    i = 1;
                }
                if (i == -1) {
                    $(“.banner .img”).css({ left: -(size – 1) * 730 })
                    i = size – 2;
                }
                $(“.banner .img”).stop().animate({ left: -i * 730 }, 500)
                if (i == size – 1) {
                    $(“.banner .num li”).eq(0).addClass(“on”).siblings().removeClass(“on”)
                } else {
                    $(“.banner .num li”).eq(i).addClass(“on”).siblings().removeClass(“on”)
                }
            }
        })
    </script>
</head>
<body>
    <div class=”banner”>
        <ul class=”img”>
            <li>
                <a href=”#”>
                    <img src=”http://cdn.attach.qdfuns.com/notes/pics/201611/20/204501j1kgrmc8o0xz15rr.jpg”>
                </a>
            </li>
            <li>
                <a href=”#”>
                    <img src=”http://cdn.attach.qdfuns.com/notes/pics/201611/20/204502e1q953x8q3fkd2w5.jpg”>
                </a>
            </li>
            <li>
                <a href=”#”>
                    <img src=”http://cdn.attach.qdfuns.com/notes/pics/201611/20/204501uil4248llsx3ighy.jpg”>
                </a>
            </li>
            <li>
                <a href=”#”>
                    <img src=”http://cdn.attach.qdfuns.com/notes/pics/201611/20/204621yit6j4ta46tk55nn.jpg”>
                </a>
            </li>
        </ul>
        <ul class=”num”>
        </ul>
        <div class=”btn btn_l”>&lt;</div>
        <div class=”btn btn_r”>&gt;</div>
    </div>
</body>
</html>

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