js原生轮播图

轮播图是新手学前端的必经之路!

直接上代码!


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .all{
            margin: 100px auto;
            width: 520px;
            height: 280px;
            position: relative;
            cursor: pointer;
            overflow: hidden;
        }
        /*图片*/
        .all .pic{
            width: 3120px;
            height: 280px;
            position: absolute;
            top: 0;
            left: 0;
        }
        /*左右点击*/
        .all .slip{
            width: 520px;
            height: 24px;
            position: absolute;
            top: 50%;
            left: 0;
            margin-top: -12px;
            font-size: 36px;
        }
        .all .slip .left{
            float: left;
            width: 21px;
            height: 36px;
            padding-left: 3px;
            background: rgba(0, 0, 0, 0.5);
        }
        .all .slip .right{
            float: right;
            width: 21px;
            height: 36px;
            padding-left: 3px;
            background: rgba(0, 0, 0, 0.5);
        }
        .all .slip span{
            color: white;
            /*width: 10px;*/
            line-height: 36px;
            display: inline-block;
            margin: 0 auto;
        }
        /*小圆点*/
        .all .circle ul{
            width: 65px;
            height: 13px;
            overflow: hidden;
            position: absolute;
            bottom: 10px;
            left: 50%;
            margin-left: -32px;
            list-style: none;
            background: rgba(255, 255, 255, 0.3);
            border-radius: 7px;
            cursor: hand;
        }
        .all .circle ul li{
            width: 9px;
            height: 9px;
            background-color: gainsboro;
            border-radius: 50%;
            float: left;
            margin: 2px;
        }
    </style>
</head>
<body>
<div class="all">
    <div class="pic" id="pic">
　　　　<!--这里是要放五张图片不过要把第一张连接到最后一张 这样能显示较好的轮播效果-->

　　　　　　<img src="data:images/1.jpg" alt=""/><img src="data:images/2.jpg" alt=""/><img src="data:images/3.jpg" alt=""/><img src="data:images/4.jpg" alt=""/><img src="data:images/5.jpg" alt=""/><img src="data:images/1.jpg" alt=""/>

    </div>
    <div class="slip">
        <div class="left" id="slip_left"><span><</span></div>
        <div class="right" id="slip_right"><span>></span></div>
    </div>
    <div class="circle">
        <ul id="circle_ul">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</div>
<script>
    //获取dom元素
    var pic = document.getElementById("pic");
    var slipLeft = document.getElementById("slip_left");
    var slipRight = document.getElementById("slip_right");
    var circileUl = document.getElementById("circle_ul");
    var lis = circileUl.getElementsByTagName("li");
    //命名变量 leader为盒子所在位置 target为盒子目标位置(在点击左右按钮及小圆点确定位置时用到)
    var leader = 0, target = 0;
    var time1 = null,time2 = null,time3 = null;

    //time1 定时器是在没有任何操作下 让图片开始轮着播放出来
    time1 = setInterval(autoplay,1);
    //    轮播函数
    function autoplay() {
        leader--;
        //当位置超过之后重新回到第一张
        leader < -2599? leader = 0 : leader;
        pic.style.left = leader + "px";
        //当整张图片显示出来的时候停留两秒
        if(leader%520 == 0){
            target = leader;
            clearInterval(time1);
            //设置定时器在两秒之后重新开启轮播的定时器time1
            time2 = setTimeout(function () {
                time1 = setInterval(autoplay,1);
            },2000);
        }
        //将小圆点的颜色全部变为灰色
        for(var i = 0; i < lis.length; i++){
            lis[i].style.backgroundColor = "gainsboro";
        }
        //选中当前选中的图片对应的小圆点将他的颜色变为橘黄色
        if(-target/520 == 5){
            lis[0].style.backgroundColor = "#f40";
        }else{
            lis[(-target/520)].style.backgroundColor = "#f40";
        }
    }
    //move为在点击之后跳转到目标目标图片的函数
    function move(){
        leader = leader + (target - leader)/10;
        pic.style.left = leader + "px";
        if(Math.abs(leader)%520 < 0.1 || (Math.abs(leader)%520 - 520) > -0.1){
            leader = target;
            clearInterval(time3);
            time2 = setTimeout(function () {
                time1 = setInterval(autoplay,1);
            },2000);
        }
        for(var i = 0; i < lis.length; i++){
            lis[i].style.backgroundColor = "gainsboro";
        }
        if(-target/520 == 5){
            lis[0].style.backgroundColor = "#f40";
        }else{
            lis[(-target/520)].style.backgroundColor = "#f40";
        }
    }

    //左滑点击事件
    slipLeft.onclick = function () {
        //点击之后先清除定时器
        clearInterval(time1);
        clearTimeout(time2);
        clearTimeout(time3);
        //得到目标值
        if(leader%520 == 0){
            target = target + 520;
        }
        target > 0? target = -2080 : target;
        time3 = setInterval(move,10);
    };

    //右滑点击事件
    slipRight.onclick = function () {
        clearInterval(time1);
        clearTimeout(time2);
        clearTimeout(time3);
        if(leader%520 == 0){
            target = target - 520;
            target < -1560? target = 0 : target;
        }else{
            target < -1560? target = 0 : target -=520;
        }
        time3 = setInterval(move,10);
    };

    //设置点击圆点触发的事件
    for(var i = 0; i < lis.length; i++){
        //得到下标
        lis[i].index = i;
        lis[i].onclick = function () {
            clearInterval(time1);
            clearTimeout(time2);
            clearTimeout(time3);
            //得到目标位置值
            target = - this.index*520;
            time3 = setInterval(move,10);
            //将选中的的小圆点变色
            this.style.backgroundColor = "#f40";
        }
    }
</script>
</body>
</html>

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