JavaScript编写的计时器/倒计时也可以改一下参数（用到的图片已经上传）

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>秒钟计时器</title>
        <script>
         
        function setnumber(n){
            if(n<10)
            return '0'+'0'+n;
            else if(n>=10&&n<=99)
            return '0'+n;
            else
            return ''+n;
        }
         
 
        window.onload=function(){
            var d=document.getElementsByTagName('img');
            var time=0,time1;
             
            function clik(){
            time=setnumber(time);
            for(var i=0;i<d.length;i++){
                d[i].src='img/'+time.charAt(i)+'.png';
            }
             
            /*if(time==0){
                time=60;
            }*/
            time++;
            }
            time1=setInterval(clik,1000);
            //clik();
        };
             
        </script>
         
    </head>
    <body style="background: black;color: white;font-size: 50px;">
        <img src="img/0.png">
        <img src="img/0.png">
        <img src="img/0.png">
    </body>
</html>