js鼠标事件（一）实现banner的轮播效果

来源：互联网发布：python 爬虫库推荐编辑：程序博客网时间：2024/05/21 08:05

一.要实现的效果

1.点击左右可切换图片
2.点击小圆点可切换图片

二.效果图

这里写图片描述

三.代码

1.css

<style type="text/css">body,img,span,ul,li{margin: 0;padding: 0;}#div1{width: 600px;height: 350px;margin: 150px auto;border: 10px solid #eee;position: relative;}img{width: 600px;height: 350px;}span{display: inline-block;position: absolute;width: 50px;height: 50px;border-radius: 25px;background:rgba(0,0,0,.3); font-size: 30px;line-height: 50px;text-align: center;cursor: pointer;color: white;}span:hover{background:rgba(255,255,255,.5);color:black;transform:scale(1.3);}span#L{left: 10px;top: 150px;}span#R{right: 10px;top: 150px;}#div1 #ul{position: absolute;bottom: 10px;left: 250px;width: 125px;height: 20px;}#div1 #ul li{list-style: none;float: left;height: 20px;width: 20px;border-radius: 10px;background:rgba(255,255,255,.5); margin-right: 5px;cursor: pointer;}#div1 #ul .active{background:rgba(0,0,0,.5);}</style>

2.html

<body>    <div id="div1">        <img src="" alt="">        <span id="L">&lt;</span>        <span id="R">&gt;</span>        <ul id="ul">          <li></li>          <li></li>          <li></li>          <li></li>          <li></li>        </ul>    </div></body>

3.js

<script type="text/javascript">window.onload=function(){    var div1=document.getElementById('div1');    var oImg=div1.getElementsByTagName('img')[0];    var spanL=document.getElementById('L');    var spanR=document.getElementById('R');    var oUl=document.getElementById('ul');    var oLi=oUl.getElementsByTagName('li');    var arrImg=['img2/1.jpg','img2/2.jpg','img2/3.jpg','img2/4.jpg','img2/5.jpg'];    var num=0;    var oldLi=0;    function fn(num) {        oImg.src=arrImg[num];    }    fn(0);    function fnLi(num){        oLi[oldLi].className='';       oLi[num].className='active';       oldLi=num;    }    fnLi(0);    /*点击左右span图片切换*/    /*点击左右span时li切换*/    spanL.onclick=function(){        if (num<1) {           num=arrImg.length-1;           fn(num);           fnLi(num);        }else{           num--;           fnLi(num);           fn(num);        }            }    spanR.onclick=function(){        if (num==arrImg.length-1) {           num=0;           fn(num);           fnLi(num);        }else{           num++;           fnLi(num);           fn(num);        }            }    /*点击li实现图片切换*/    for (var i = 0; i < oLi.length; i++) {        oLi[i].index=i;        oLi[i].onclick=function(){            fn(this.index);            fnLi(this.index);        }    }}</script>

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