<script type="text/javascript"> var tid; var bClicked = false; function sbm(){     if(bClicked){         alert("提示您，请不要重复递交");         return false;        }     bClicked = true;     tid = setTimeout("doit()", 10000);     //document.forms[0].submit(); }

function doit(){

    if(tid!=null){clearTimeout(tid);tid=null;}     bClicked = false; } </script>

<form action="xxx" target="hf">

  <input name="btn" type="button" οnclick="sbm();" value=" 提交 "> </form> <iframe name="hf"></iframe>