How to set up js to prohibit repeated submission of forms

  
  
  
  
  
  
  
  function formsubmit() {
  Today = new Date();
  var NowHour = Today.getHours();
  var NowMinute = Today.getMinutes();
  var NowSecond = Today.getSeconds();
  var mysec = (NowHour*3600)+(NowMinute*60)+NowSecond;
  if((mysec-document.formsubmitf.mypretime.value)>600){
  //600只是一个时间值，就是5分钟内禁止重复提交，值随便 
  document.formsubmitf.mypretime.value=mysec;
  }
  else{
  alert(' 按一次就够了，请勿重复提交！请耐心等待！谢谢合作！');
  return false;
  }
  document.forms.formsubmitf.submit();
  }
  
  

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