完整html +css +原生js轮播图

html

<div class="all" id='box'>
    <div class="screen">
        <ul>
            <li><img src="images/1.jpg" width="500" height="200"/>li>
            <li><img src="images/2.jpg" width="500" height="200"/>li>
            <li><img src="images/3.jpg" width="500" height="200"/>li>
            <li><img src="images/4.jpg" width="500" height="200"/>li>
            <li><img src="images/5.jpg" width="500" height="200"/>li>
        ul>
        <ol>
        ol>
    div>
    <div id="arr"><span id="left"><span><span id="right">>span>div>
div>

css

        * {
            padding: 0;
            margin: 0;
            list-style: none;
            border: 0;
        }

        .all {
            width: 500px;
            height: 200px;
            padding: 7px;
            border: 1px solid #ccc;
            margin: 100px auto;
            position: relative;
        }

        .screen {
            width: 500px;
            height: 200px;
            overflow: hidden;
            position: relative;
        }

        .screen li {
            width: 500px;
            height: 200px;
            overflow: hidden;
            float: left;
        }

        .screen ul {
            position: absolute;
            left: 0;
            top: 0px;
            width: 3000px;
        }

        .all ol {
            position: absolute;
            right: 10px;
            bottom: 10px;
            line-height: 20px;
            text-align: center;
        }

        .all ol li {
            float: left;
            width: 20px;
            height: 20px;
            background: #fff;
            border: 1px solid #ccc;
            margin-left: 10px;
            cursor: pointer;
        }

        .all ol li.current {
            background: yellow;
        }

        #arr {
            display: none;
        }

        #arr span {
            width: 40px;
            height: 40px;
            position: absolute;
            left: 5px;
            top: 50%;
            margin-top: -20px;
            background: #000;
            cursor: pointer;
            line-height: 40px;
            text-align: center;
            font-weight: bold;
            font-family: '黑体';
            font-size: 30px;
            color: #fff;
            opacity: 0.3;
            border: 1px solid #fff;
        }

        #arr #right {
            right: 5px;
            left: auto;
        }
    </style>

js

<script>
    var times = null;
    //获取全部对象
    var box = document.getElementById("box");
    var screen = box.children[0];
    var ul = screen.children[0];
    var ol = screen.children[1];
    var ulLis = ul.children;
    var arr = document.getElementById("arr");
    var left = document.getElementById("left");
    var right = document.getElementById("right");
    //获取banner的宽度
    var imgW = screen.offsetWidth;
    var imgIndex = 0;
    var seqare = 0;
    //在OL中生成对象
    for (var i = 0; i < ulLis.length; i++) {
       //创建原点"li"
        var li = document.createElement("li");
        //ol 添加全部li
        ol.appendChild(li);
        li.innerHTML = i + 1;
    }
    //获取OL中全部的li
    var olLis = ol.children;
    olLis[0].className = "current";
    //克隆第一章到最后
    var fristImg = ulLis[0].cloneNode(true);
    ul.appendChild(fristImg);
    for (var i = 0; i < olLis.length; i++) {
        olLis[i].index = i;
        //注册鼠标移动事件
        olLis[i].onmouseover = function () {
            //注册排他
            for (var i = 0; i < olLis.length; i++) {
                olLis[i].removeAttribute("class");
            }
            this.setAttribute("class", "current");
            var target = -this.index * imgW;
            animate(ul, target);
            seqare = this.index;
            imgIndex = this.index;
        }
    }
    //显示左右箭头
    box.onmouseover = function () {
        arr.style.display = "block";
        clearInterval(times);
    };
    box.onmouseout = function () {
        arr.style.display = "none";
        times = setInterval(right.onclick,1000);
    };
    right.onclick = function () {
        if (imgIndex == ulLis.length - 1) {
            ul.style.left = 0 + "px";
            imgIndex = 0;
        }

        imgIndex++;

        var target = -imgIndex * imgW;
        animate(ul, target);
        if (seqare < olLis.length - 1) {
            seqare++;
        } else {
            seqare = 0;
        }
        for (var i = 0; i < olLis.length; i++) {
            olLis[i].removeAttribute("class");
        }
        olLis[seqare].setAttribute("class", "current");

    };
    times = setInterval(right.onclick,1000);
    left.onclick = function () {
        if (imgIndex == 0) {
            ul.style.left = -(ulLis.length - 1) * imgW + "px";
            imgIndex = ulLis.length - 1;
        }
        imgIndex--;
        var target = -imgIndex * imgW;
        animate(ul, target);
        if (seqare > 0) {
            seqare--;
        } else {
            seqare = olLis.length - 1;
        }
        for (var i = 0; i < olLis.length; i++) {
            olLis[i].removeAttribute("class");
        }
        olLis[seqare].setAttribute("class", "current");
    };
    //运动动画
    function animate(obj, target) {
        clearInterval(obj.timer);
        obj.timer = setInterval(function () {
            var leader = obj.offsetLeft;//获取当前位置
            var step = 30;
            step = leader < target ? step : -step;
            if (Math.abs(leader - target) >= Math.abs(step)) {
                leader = leader + step;
                obj.style.left = leader + "px";
            } else {
                obj.style.left = target + "px";
                clearInterval(obj.timer);
            }
        }, 15);
    }
script>