在jQuery之焦点图转换-左右的基础上，将jQuery代码改成js原生，并添加定时器（setInterval()和clearInterval()）
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>焦点图转换--原生和定时器</title> <link href="https://www.jb51.net/css/reset.css"> <style type="text/css"> .pic-show{width: 480px;overflow: hidden;} #pic{width: 1920px;height: 320px;position: relative;} #pic img{display: block;float: left;} .pic-show>img{display: block;cursor: pointer;opacity: 0.8; position: absolute;top: 142px;left: 30px;} .pic-show>img:last-child{display: block; position: absolute;left: 414px; } ul{width: 120px;height: 18px;position: absolute;top: 280px;left: 185px;} li{float: left;width: 20px;height: 18px;margin-left: 5px;} a{display: block;width: 20px;height: 18px;text-decoration: none;border: 1px solid #ccc;border-radius: 50%;background-color: #ccc;opacity: 0.6;} a:hover{background-color: #094a99;} .aCss{background-color: #094a99;} p{width: 480px;text-align: center;} </style> </head> <body> <div> <div> <img src="https://www.jb51.net/images/1.jpg" alt=""> <img src="https://www.jb51.net/images/2.jpg" alt=""> <img src="https://www.jb51.net/images/3.jpg" alt=""> <img src="https://www.jb51.net/images/4.jpg" alt=""> </div> <img src="https://www.jb51.net/images/slider-prev.png" alt=""> <img src="https://www.jb51.net/images/slider-next.png" alt=""> </div> <ul> <li><a href="#" title="日落"></a></li> <li><a href="#" title="钢琴"></a></li> <li><a href="#" title="大海"></a></li> <li><a href="#" title="秋色"></a></li> </ul> <p>这是一段测试文字</p> <script src="https://www.jb51.net/js/jquery-3.0.0.js"></script> <script type="text/javascript"> var num=0; function G(id){ return document.getElementById(id) } var pic = G('pic') var next = G('next') var prev = G('prev') var p = G('p') var list = G('list') var arr = G('list').getElementsByTagName('a') //点击next next.onclick=function(){ if(num<3){ num=num+1; } else{ num=0; } console.log(num); var mlNum=num * -480+'px'; pic.style.marginLeft=mlNum; for(var j=0;j<arr.length;j++){ arr[j].style.backgroundColor='#ccc'; } arr[num].style.backgroundColor="#094a99"; event.preventDefault(); var txt=arr[num].getAttribute("title"); console.log(txt); p.textContent=txt; } //点击prev prev.onclick=function(){ if(num>0){ num=num-1; } else{ num=3; } console.log(num); var mlNum2=num * -480+'px'; pic.style.marginLeft=mlNum2; for(var j=0;j<arr.length;j++){ arr[j].style.backgroundColor='#ccc'; } arr[num].style.backgroundColor="#094a99"; event.preventDefault(); var txt=arr[num].getAttribute("title"); console.log(txt); p.textContent=txt; } for(var i=0;i<arr.length;i++){ arr[i].index=i;//创建索引值 arr[i].onclick=function(event){ num=this.index; var mlNum3=num * -480+'px'; pic.style.marginLeft=mlNum3; for(var j=0;j<arr.length;j++){ arr[j].style.backgroundColor='#ccc'; } this.style.backgroundColor='#094a99'; event.preventDefault(); var txt=this.getAttribute("title"); p.textContent=txt; } } //函数封装 function lunbo(){ if(num<3){ num=num+1; } else{ num=0; } console.log(num); var mlNum=num * -480+'px'; pic.style.marginLeft=mlNum; for(var j=0;j<arr.length;j++){ arr[j].style.backgroundColor='#ccc'; } arr[num].style.backgroundColor="#094a99"; event.preventDefault(); var txt=arr[num].getAttribute("title"); console.log(txt); p.textContent=txt; } //通过定时器调用封装好的函数 var stop=setInterval(lunbo,1500); //鼠标放上和离开时定时器的状态 pic.onmouseenter=function(){ clearInterval(stop) } pic.onmouseleave=function(){ stop=setInterval(lunbo,1500) } </script> </body> </html>
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