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js轮播

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        #wrap {
            width: 590px;
            height: 340px;
            margin: 50px auto;
            border: #000 1px solid;
            overflow: hidden;
            position: relative;
        }

        #wrap a {
            display: block;
            width: 50px;
            height: 30px;
            background: #000;
            opacity: .5;
            color: #fff;
            line-height: 30px;
            text-align: center;
            position: absolute;
            top: 50%;
            margin-top: -15px;
            text-decoration: none;
            font-weight: 900;
            font-size: 24px;
            z-index: 990;
        }

        #prev {
            left: 0;
        }

        #next {
            right: 0;
        }

        #btn {
            position: absolute;
            left: 50%;
            bottom: 10px;
            width: 130px;
            margin-left: -65px;
            z-index: 999;
        }

        #btn li {
            width: 20px;
            height: 20px;
            float: left;
            margin-left: 6px;
            border-radius: 50%;
            background: #c00;
        }

        #btn li.active {
            background: #ccc;
        }

        #box {
            height: 340px;
            position: absolute;
        }

        #box li {
            width: 590px;
            height: 340px;
            position: absolute;
            left: 0;
            top: 0;
            opacity:0;
        }

        #box img {
            width: 590px;
            height: 340px;
        }
    </style>
    <script src="http://www.mamicode.com/move.js"></script>
    <script>
        window.onload = function () {
            var oWrap = document.getElementById(‘wrap‘);
            var oBox = document.getElementById(‘box‘);
            var oBtn = document.getElementById(‘btn‘);
            var aBtn = oBtn.children;
            var aLi = oBox.children;
            var oPrev = document.getElementById(‘prev‘);
            var oNext = document.getElementById(‘next‘);
            var iNow = 0;

            for (var i = 0; i < aBtn.length; i++) {
                aBtn[i].index = i;
                aBtn[i].onclick = function () {
                    iNow = this.index;
                    tab();
                }
            }

            function tab() {
                for (var i = 0; i < aLi.length; i++) {
                    aBtn[i].className = ‘‘;
                    move(aLi[i], {opacity: 0});
                }
                aBtn[iNow].className = ‘active‘;
                move(aLi[iNow], {opacity: 1});
            }
            oPrev.onclick = function () {
                iNow--;
                if (iNow == -1)iNow = aBtn.length - 1;
                tab();
            };

            oNext.onclick = next;
            function next() {
                iNow++;
                if (iNow == aBtn.length)iNow = 0;
                tab();
            }
            var timer = null;
            timer = setInterval(next,3000);
            oWrap.onmouseover = function(){
                clearInterval(timer);
            };
            oWrap.onmouseout = function(){
                timer = setInterval(next,3000);
            };
        }
    </script>
</head>
<body>
<div id="wrap">
    <a href="javascript:;" id="prev">←</a>
    <a href="javascript:;" id="next">→</a>
    <ul id="box">
        <li style="opacity:1;"><img src="http://www.mamicode.com/img/1.jpg" /></li>
        <li><img src="http://www.mamicode.com/img/2.jpg" /></li>
        <li><img src="http://www.mamicode.com/img/3.jpg" /></li>
        <li><img src="http://www.mamicode.com/img/4.jpg" /></li>
        <li><img src="http://www.mamicode.com/img/5.jpg" /></li>
    </ul>
    <ol id="btn">
        <li class="active"></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ol>
</div>
</body>
</html>

 

/**
 * Created by Administrator on 2016/11/3.
 */
function getStyle(obj, name) {
    if (obj.currentStyle) {
        return obj.currentStyle[name];
    } else {
        return getComputedStyle(obj, false)[name];
    }
}

function move(obj, json, options) {
    clearInterval(obj.timer);
    options = options || {};
    options.time = options.time || 500;
    options.easeing = options.easeing || ‘ease-out‘;
    var dis = {};
    var start = {};
    for (var name in json) {
        start[name] = parseFloat(getStyle(obj, name));
        dis[name] = json[name] - start[name];
    }
    var count = Math.floor(options.time / 30);
    var n = 0;
    obj.timer = setInterval(function () {
        n++;
        for (var name in json) {
            switch (options.easeing) {
                case ‘linear‘:
                    var a = n / count;
                    var cur = start[name] + dis[name] * a;
                    break;
                case ‘ease-in‘:
                    var a = n / count;
                    var cur = start[name] + dis[name] * a * a * a;
                    break;
                case ‘ease-out‘:
                    var a = 1 - n / count;
                    var cur = start[name] + dis[name] * (1 - a * a * a);
            }
            if (name == ‘opacity‘) {
                obj.style.opacity = cur;
                obj.style.filter = ‘alpha(opacity:‘ + cur * 100 + ‘)‘;
            } else {
                obj.style[name] = cur + ‘px‘;
            }
        }
        if (n == count) {
            clearInterval(obj.timer);
            options.fn && options.fn();
        }
    }, 30);
}

js轮播