Javascript 京东轮播图

Posted 2020-12-03 696095ddd

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="Author" content="">
    <meta name="Keywords" content="京东，轮播">
    <meta name="Description" content="京东首页轮播图">
    <title>京东</title>
    <style>
    * {
        padding: 0;
        margin: 0;
    }
    li {
        list-style: none;
    }
    #flash {
        margin: 100px auto;
        width: 590px;
        height: 470px;
        overflow: hidden;
        position: relative;
    }
    #pic li{
        position: absolute;
        left: 0;
        top: 0;
        display: none;
    }
    #doc {
        width: 100px;
        height: 26px;
        background-color: rgba(0,0,0,0.7);
        position: absolute;
        bottom: 10px;
        left: 50%;
        transform: translate(-50%);
        border-radius: 15px;
    }
    #doc li {
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: rgba(255,255,255,0.9);
        float: left;
        margin: 5px 9px;
    }
    #doc .on {
        background-color: red;
    }
    #btn li {
        width: 28px;
        height: 28px;
        border-radius: 50%;
        background-color: rgba(0,0,0,0.7);
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        text-align: center;
        line-height: 28px;
        color: #fff;
        font-weight: 700;
        display: none;
    }
    #prev {
        left: 10px;
    }
    #next {
        right: 10px;
    }
    #flash:hover #btn li{
        display: block;
    }
    #flash:hover,#btn li:hover,#doc li:hover {
        cursor: pointer;
    }
    </style>
</head>
<body>
    <div id="flash">
        <ul id="pic">
            <li style="display: block;"><img src="images/1531057087.jpg" alt="京东"></li>
            <li><img src="images/1531057087(1).jpg" alt="京东"></li>
            <li><img src="images/1531057087(2).jpg" alt="京东"></li>
        </ul>
        <ul id="doc">
            <li class="on"></li>
            <li></li>
            <li></li>
        </ul>
        <ul id="btn">
            <li id="prev"><</li>
            <li id="next">></li>
        </ul>
    </div>
    <script>
        window.onload=function(){
            var flash=document.getElementById("flash");
            var pic=document.getElementById("pic");
            var p_lis=pic.getElementsByTagName("li");
            var doc=document.getElementById("doc");
            var d_lis=doc.getElementsByTagName("li");
            var timer=null;
            var index=0;
            var left=document.getElementById("prev");
            var right=document.getElementById("next");

            //设置定时器
            timer=setInterval(run, 2000);
            //自动放
            function run(){
                index++;
                if(index>=p_lis.length) {index=0;}
                changeImage(index);
            }
            flash.onmouseover=function() {
                clearInterval(timer);
            }
            flash.onmouseout=function() {
                timer=setInterval(run,2000);
            }
            for (var i = 0; i <d_lis.length; i++) { 
                d_lis[i].id=i;
                //鼠标在小圆点上
                d_lis[i].onmouseover=function(){    
                    clearInterval(timer);
                    changeImage(this.id);
                }
            }
            left.onclick=function() {
                index--;
                if(index<0){
                    index=p_lis.length-1;
                }
                changeImage(index);
            }
            right.onclick=function() {
                index++;
                if(index>p_lis.length-1){
                   index=0;
                }
                changeImage(index);
            }
            function changeImage(currindex){
                for (var i = 0; i < p_lis.length; i++) {
                    p_lis[i].style.display="none";
                    d_lis[i].className="";
                }
                p_lis[currindex].style.display="block";
                d_lis[currindex].className="on";
                 // index=currindex;
            }

        }
    </script>
</body>

</html>

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