中秋节模仿淘宝中央焦点广告图垂直水平滑动效果 -

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中秋节模仿淘宝中央焦点广告图垂直水平滑动效果

博客分类：

JS动画

javascript

花了几个小时的时间，终于实现了类似淘宝主页上的中央焦点广告图的动态的水平与垂直的滑动效果，个人感觉实现出的效果还不错，挺有成就感的，后面有附件，解压后可直接运行，以下是所有html及js代码：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }

        body {
            text-align: center;
        }

        img {
            border: none;
            float: left;
        }

        div.main {
            position: relative;
            width: 490px;
            height: 170px;
            margin: 100px auto;
        }

        div.box {
            width: 490px;
            height: 170px;
            margin: 100px auto;
            overflow: hidden;
        }

        ul.images {
            list-style: none;
            /*width: 2450px;*/
        }

        ul.images li {
            float: left;
        }

        ul.adNav {
            list-style: none;
            position: absolute;
            bottom: 5px;
            right: 5px;
            z-index: 10;
        }

        ul.adNav li {
            font: normal 13px 'arial';
            /*font-family: arial,serif;*/
            float: left;
            width: 20px;
            height: 20px;
            line-height: 20px;
            text-align: center;
            color: #DE7D4B;
            background-color: white;
            opacity: .7;
            margin-left: 3px;
            cursor: pointer;
            -webkit-border-radius: 20px;
            -moz-border-radius: 20px;
            border-radius: 20px;
        }

        ul.adNav li.active {
            font-weight: bolder;
            background-color: #F60;
            color: white;
            opacity: 1;
        }
    </style>
</head>
<body>
<div id="main" class="main">
    <div id="box" class="box">
        <ul id="images" class="images">
            <li>
                <a href="#">
                    <img src="images/ad1.png" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad2.gif" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad3.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad4.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad5.png" alt="">
                </a>
            </li>
        </ul>
        <ul id="adNav" class="adNav">
            <li class="active">1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ul>
    </div>
</div>

<div id="main1" class="main">
    <div id="box1" class="box">
        <ul id="images1" class="images">
            <li>
                <a href="#">
                    <img src="images/ad6.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad7.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad8.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad9.jpg" alt="">
                </a>
            </li>
            <li>
                <a href="#">
                    <img src="images/ad10.png" alt="">
                </a>
            </li>
        </ul>
        <ul id="adNav1" class="adNav">
            <li class="active">1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ul>
    </div>
</div>

<script type="text/javascript">
    window.onload = function() {
        var $ = function() {
            return document.getElementById.call(document, arguments[0])
        };

        function Scroller() {
            this.init.apply(this, arguments);
            this.intervalShow();
        }

        Scroller.prototype = {
            init: function(shell, box, imageUl, navUl, visibleSize, time, direction, picWidth, picHeight) {
                var imageList = imageUl.getElementsByTagName('li');
                var navList = navUl.getElementsByTagName('li');
                if (imageList.length !== navList.length) {
                    throw new Error('图片数必须与导航条的数目相同');
                }
                this.shell = shell;
                this.box = box;
                this.imageList = imageList;
                this.navList = navList;
                this.size = imageList.length;//图片数目

                this.currentIndex = 0;//当前正在显示的图片索引
                this.visibleSize = visibleSize || 170;//一个图片的宽或高
                this.time = time || 500;//滑动一个图片所用时间
                this.sliding = false;//是否处于滑动状态
                this.timeout = null;//超时句柄
                this.direction = direction || 'vertical';

                this.shell.style.cssText += ';position:relative;height:' + picHeight + 'px;width:' + picWidth + 'px;';
                this.box.style.cssText += ';overflow:hidden;height:' + picHeight + 'px;width:' + picWidth + 'px;';

                if (this.direction === 'vertical') {//垂直滑动
                    imageUl.style.cssText += ';width:' + picWidth + 'px;height:' + this.size * picHeight + 'px;';
                    this.direction = 'scrollTop';
                } else {//水平滑动
                    imageUl.style.cssText += ';width:' + picWidth * this.size + 'px;height:' + picHeight + 'px;';
                    this.direction = 'scrollLeft';
                }

                //为每个导航li注册mouseover与click事件
                for (var i = 0, len = this.navList.length; i < len; i++) {
                    var navLi = this.navList[i];
                    var that = this;//为了在闭包中使用当前对象
                    navLi.onmouseover = navLi.onclick = (function(index) {
                        return function(e) {
                            if (that.sliding) {//如果还有处于滑动状态中的li，则清理timeout并将位置设置到先前最终应该到达的位置,为了防止出现频繁闪烁的现象
                                clearTimeout(that.timeout);
                                that.box.scrollTop = that.currentIndex * that.visibleSize;
                            }
                            e = e || window.event;
                            var target = e.target || e.srcElement;

                            that.slide.call(that, target, index);//在闭包内调用slide函数
                        }
                    })(i);
                }
            },
            slide:function(target, index) {
                if (Array.prototype.indexOf.call(this.navList, target) === this.currentIndex)
                    return;

                var finalScrollPosition = index * this.visibleSize;//最终要定位到的位置
                var currentScrollPosition = this.currentIndex * this.visibleSize;//当前位置

                for (var j = 0,len = this.navList.length; j < len; j++) {//清除每个导航Li的样式
                    var li = this.navList[j];
                    li.className = '';
                }

                target.className = 'active';//设置当前li为激活状态

                var moveSize = finalScrollPosition - currentScrollPosition;//本次要移动的长度
                var begin = new Date().getTime();

                this.currentIndex = index;
                var that = this;

                function animate() {//动画显示，用正统函数模拟动画效果
                    this.sliding = true;//处于滑动状态
                    var now = new Date().getTime();
                    var elapsed = now - begin;

                    if (elapsed >= this.time) {
                        this.box[this.direction] = finalScrollPosition;
                        this.sliding = false;//滑动结束
                        return;
                    }

                    var distance = currentScrollPosition + moveSize * Math.sin(Math.PI * 0.5 * (elapsed / this.time));
                    this.box[this.direction] = distance;
                    this.timeout = setTimeout(function() {
                        animate.call(that);//再次调用
                    }, Math.min(25, this.time - elapsed));
                }

                this.timeout = setTimeout(function() {
                    animate.call(that);//开始动画
                }, 25);
            },
            intervalShow:function() {//间隔显示
                var that = this;
                setTimeout(function() {
                    var index = (that.currentIndex + 1) % that.navList.length;
                    that.slide(that.navList[index], index);
                    setTimeout(arguments.callee, 3000);//每隔3秒自动显示一次
                }, 3000);
            }
        };

        new Scroller($('main'), $('box'), $('images'), $('adNav'), 490, 500, 'horizontal', 490, 170);//水平滑动
        new Scroller($('main1'), $('box1'), $('images1'), $('adNav1'), 170, 500, 'vertical', 490, 170);//垂直滑动
    }
</script>
</body>
</html>