想要鼠标放在圆点上的时候切换图片，怎么弄呀

            var timer='';
            var index=0;
            var banner=document.getElementById('top_wrap');
            var li=banner.getElementsByTagName('li');
            var a=banner.getElementsByTagName('div');
            var main=document.getElementById('banner');
            var len=a.length;
            for(var i=0; i<li.length; i++){
                li[i].index=i;
                li[i].onmouseover=function(){
                    for(var i=0;i<li.length; i++){
                        li[i].className='';
                    }this.className='bg';
                    for(var i=0; i<a.length; i++){
                        a[i].className='active';
                    }a[this.index].className='';
                }
        }
            function changeimg(){
                for(var i=0; i<a.length; i++){
                    a[i].style.display='none';
                }a[index].style.display='block';
            }
            function slideimg(){
                main.onmouseover=function(){
                    if(timer){
                        clearInterval(timer);
                    }
                }
                main.onmouseout=function(){
                    timer=setInterval(function(){
                        index++;
                        if(index>=len){
                            index=0;
                        }
                            changeimg();
                    },2000);
                }
                main.onmouseout();
            }
            slideimg();
             
             
             
<div id="top_wrap">
        <div><img src="img/bg1.jpg"></div>
        <div class="active"><img src="img/bg2.jpg"></div>
        <div class="active"><img src="img/bg3.jpg"></div>
        <ul>
            <li class="bg"></li>
            <li></li>
            <li></li>
        </ul>
        </div>

这个头像是黑豹 2018-05-15

源自：项目：JavaScript轮播图 3-3 轮播图之定时器设置

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2回答

一叶知秋519 2018-05-15 13:58:59

建议同学继续学习，在后面的课程中会讲解到的~~

祝学习愉快！

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提问者这个头像是黑豹 #1

我不是想点击的，是想鼠标放上去就切换的，麻烦您帮我看下，求~

2018-05-15 14:01:14
一叶知秋519 回复提问者这个头像是黑豹 #2

建议同学先根据老师的课程完成案例以后再进行扩展，如果不想要点击，想要把鼠标滑过圆点就切换，可以把对应的事件换一下~~例如把点击事件替换成鼠标进入事件mouseenter后再试下~~

2018-05-15 15:54:57