js.button

<script language="javascript">
 function start()
 {
     document.getElementById("Button1").disabled = true;
     document.getElementById("Button1").value = 10;
     window.setTimeout("tick()",1000);
    
 }
 function tick()
 {
     var time = new Number(document.getElementById("Button1").value);
     if(time>0)
     {
         document.getElementById("Button1").value = time-1;
         window.setTimeout("tick()",1000);
     }
     else
     {
         document.getElementById("Button1").disabled = false;
         document.getElementById("Button1").value = "保存";
     }
 }
 </script>
 <form >
 <INPUT TYPE="button" NAME="Button1" id="Button1">
 </form>
 
<script language=javascript>
  start();
 </script>