JavaScript时钟实例

 <!DOCTYPE html>
 <html>
 <head lang="en">
     <meta charset="UTF-8">
     <title>Date</title>
 </head>
 <body onload="startTime()">
 <script>
     function startTime(){
         var today = new Date();
         var h = today.getHours();
         var m = today.getMinutes();
         var s = today.getSeconds();
         m = checkTime(m);
         s = checkTime(s);
         document.getElementById("timetxt").innerHTML=h+":"+m+":"+s;
         t = setTimeout(function () {//设置超时时间，500毫秒刷新一次
             startTime();
         },500);
     }
     function checkTime(i){//检查分钟和秒，如果小于10，则在前面补0，如：01，02...
         if(i<10){
             i = "0"+i;
         }
         return i;
     }
 </script>
 <div id="timetxt"></div>
 </body>
 </html>
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JavaScript时钟实例

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