倒计时按钮

<body > <form name="myform" method="post" action="BidApplicationInput.jsp">   <table width="200" border="0" align="center">     <tr>       <td width="53"><input type="button" name="agreesubmit" value="我同意(10)" onclick="javascript:myform.submit()"></td>       <td width="73">&nbsp;</td>       <td width="60"><input type="button" name="close" value="拒绝" onclick="javascript:window.close()"></td>     </tr>   </table>    </form> <script language="javascript">  var secs = 10;//读取秒数  var wait = secs * 1000;  var agreetext=" 我同意 ";  document.myform.agreesubmit.value = agreetext+"(" + secs + ") ";  document.myform.agreesubmit.disabled = true;  for(i = 1; i <= secs; i++) {   window.setTimeout("update(" + i + ")", i * 1000);  }  window.setTimeout("timer()", wait);  function update(num, value) {   if(num == (wait/1000)) {   document.myform.agreesubmit.value = agreetext;   } else {   printnr = (wait / 1000)-num;   document.myform.agreesubmit.value = agreetext+"(" + printnr + ") ";   }  }  function timer() {   document.myform.agreesubmit.disabled = false;   document.myform.agreesubmit.value = agreetext;  } </script> </body>
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