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(); }