禁止表单重复提交

<DOCTYPE html>
<html>
<BODY BGCOLOR="#FFFFFF">
<form name='form' id ="form" method="post" action="XXX.asp">
<input type='hidden' name='mypretime' value='0'>
<input type="button" value="写好了" name="button" class="4round" onclick='formsubmit()'>
</form>

<script Language='JavaScript'>
function formsubmit() {
Today = new Date();
var NowHour = Today.getHours();
var NowMinute = Today.getMinutes();
var NowSecond = Today.getSeconds();
var mysec = (NowHour*10)+(NowMinute*10)+NowSecond;
if((mysec-document.form.mypretime.value)>10){
//600只是一个时间值，就是5分钟内禁止重复提交，值随便设
document.form.mypretime.value=mysec;
document.form.button.value="正在提交中...";
document.form.button.disabled='disabled';
}
else{
alert('您已经提交过数据，请勿重复提交！');
return false;
}
document.forms.form.submit();
}
</script>
</html>

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