Make a clock with js

<!DOCTYPE html>
<html>
<head>
   <title>140</title>
   <meta charset="utf-8">
   <style type="text/css">
       h1{
           text-align: center;
       }

       hr
       {
           border: 2px solid black;
           margin: 20px;
       }

       div
       {
           text-align: center;
           margin:30px;
       }

       .w{
           border: 2px solid black;
           padding: 20px;
           margin: 20px;
           font-size: 120px;
       }

       .a{
           font-size: 140px;
           margin: 20px;
           font-family: 黑体;
       }
   </style>
   <script type="text/javascript">
       window.onload=function ()
       {
           var s,f,m;
           var ss,ff,mm;

           s=document.getElementById("s");
           f=document.getElementById("f");
           m=document.getElementById("m");

There d;

d=new Date();

           ss=d.getHours();
           ff=d.getMinutes();
           mm=d.getSeconds();

           s.innerText = ss;
           f.innerText = ff;
           m.innerText = mm;

           function ac()
           {
               mm++;
               if(mm==60)
               {
                  mm=0;
                  ff++;

                  if (ff==60)
                  {
                      ff=0;
                      ss++;

                      if(ss==24)
                      {
                          ss=0;
                      }
                  }
               }

               if (ss<10)
               {
                  s.innerText="0"+ss;
               }
               else
               {
                  s.innerText=ss;
               }

               if (ff<10)
               {
                  f.innerText="0"+ff;
               }
               else
               {
                  f.innerText=ss;
               }

               if (mm<10)
               {
                  m.innerText="0"+mm;
               }
               else
               {
                  m.innerText=mm;
               }
           }

               setInterval(ac, 1000);
       }
   </script>
</head>
<body>
<h1>时钟</h1>
<hr>

Make a clock with js

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