【Web】Web-API(No.71)原生js实现滑动轮播图

原生js实现滑动轮播图

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【Web】Web-API(No.71)原生js实现滑动轮播图_第1张图片


<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>title>
    <style type="text/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: #DB192A;
        }

        #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>
head>
<body>
<div class="all" id='box'>
    <div id="scrren" class="screen">
        <ul id="uu">
            <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 id="oo">
        ol>
    div>
    <div id="arr"><span id="left"><span><span id="right">>span>div>
div>
<script src="common.js">script>
<script>
    var scrren = my$("scrren");//相框
    var imgWidth = scrren.offsetWidth;//相框的宽度
    var ulObj = my$("uu");//ul
    var list = my$("uu").getElementsByTagName("li");//所有的li节点
    var olObj = my$("oo");//ol
    var btnBox = my$("arr");//左右两边按钮的盒子

    //1、创建小按钮,根据小按钮切换对应的图片
    for (var i = 0; i < list.length; i++){
      
        var liObj = document.createElement("li");
        olObj.appendChild(liObj);
        liObj.innerHTML = i + 1;
        liObj.setAttribute("index",i);
        //注册鼠标移入事件
        liObj.onmouseover = function () {
      
            //先干掉所有li的背景颜色
            for (var j = 0; j < olObj.children.length - 1; j++){
      
                olObj.children[j].removeAttribute("class");
            }
            this.className = "current";
            //获取对应的索引
            index = this.getAttribute("index");
            //移动ul
            animate(ulObj,-index * imgWidth);
        }
    }
    //设置ol中第一个li默认有背景颜色
    olObj.firstElementChild.className = "current";

    //2、自动播放
    //克隆一个ul的第一张图片,添加到最后面去
    ulObj.appendChild(ulObj.children[0].cloneNode(true));
    var timeId = setInterval(move,1000);
    var index = 0;
    function move() {
      
        if (index >= list.length - 1){
      
            //直接跳转第一个图片
            index =0;
            ulObj.style.left = "0px";
        }
        index++;
        animate(ulObj,-index * imgWidth);
        //判断小圆点
        if (index == list.length - 1){
      
            //干掉最后一个按钮颜色
            olObj.children[olObj.children.length - 1].className = "";
            //给第一个按钮设置颜色
            olObj.children[0].className = "current";
        } else{
      
            //先干掉所有li的背景颜色
            for (var j = 0; j < olObj.children.length - 1; j++){
      
                olObj.children[j].removeAttribute("class");
            }
            olObj.children[index].className = "current";
        }
    }

    //3、鼠标移入移出
    my$("box").onmouseover = function () {
      
        btnBox.style.display = "block";
        clearInterval(timeId);
    }
    my$("box").onmouseout = function () {
      
        btnBox.style.display = "none";
        timeId = setInterval(move,1000);
    }

    //4、点击两边按钮
    my$("right").onclick = move;
    my$("left").onclick = function () {
      
        if (index == 0){
      
            index = list.length - 1;
            ulObj.style.left = -index * imgWidth + "px";
        }
        index--;
        animate(ulObj,-index * imgWidth);
        //先干掉所有li的背景颜色
        for (var j = 0; j < olObj.children.length - 1; j++){
      
            olObj.children[j].removeAttribute("class");
        }
        olObj.children[index].className = "current";
    }
script>
body>
html>

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