简单的setInterval应用

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title></title>

    <style type="text/css">

        #div1{

            width:500px;

            height: 500px;

            margin-top: 20px;

        }

    </style>

    <script>

        window.onload=function(){

            var aBtn=document.getElementsByTagName('input');

            var arrUrl=['images/img1.jpeg','images/img2.jpeg','images/img3.jpg','images/img4.jpeg','images/img5.jpg']

            var num=0;

            var timer=null;

            var oDiv=document.getElementById('div1');

            aBtn[0].onclick=function(){

                clearInterval(timer);

                timer=setInterval(function(){

                    oDiv.style.background='url('+arrUrl[num]+')';

                    num++;

                    num%=arrUrl.length;

                },800);

            }

            aBtn[1].onclick=function(){

                clearInterval(timer);

            }

        }

    </script>

</head>

<body>

   <input type="button" value="换背景">

   <input type="button" value="停">

   <div id="div1">hello world</div>

</body>

</html>
巴特西

简单的setInterval应用

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