??? function checkIpt(){?? ??? ?//var?? ??? ?var master=document.getElementById('master'),?? ??? ?mames=document.getElementById('mames')，?? ??? ?nLength=0;?? ??? ?master.onfocus=function(){?? ??? ??? ?mames.innerHTML='主人名字為2-5個英文字母或中文漢字！'?? ??? ??? ?}?? ??? ?master.onkeyup=function(){?? ??? ??? ?mames.innerHTML=''?? ??? ??? ?}?? ??? ?master.onblur=function checko(){?? ??? ??? ?//非法字符?? ??? ??? ?if(re.test(this.value)){?? ??? ??? ???? mames.innerHTML='含有非法字符！'?? ??? ??? ??? ?}?? ??? ??? ?//不能為空?? ??? ??? ?else if(this.value==""){?? ??? ??? ??? ?mames.innerHTML='主人名字不能為空！'?? ??? ??? ??? ?}?? ??? ??? ?//4-8個字符?? ??? ??? ?else if(this.value.length<2){?? ??? ??? ??? ?mames.innerHTML='主人名字最短為2個英文字母或中文漢字！'?? ??? ??? ??? ?}?? ??? ??? ?else if(this.value.length>5){?? ??? ??? ??? ?mames.innerHTML='主人名字最長為5個英文字母或中文漢字！'?? ??? ??? ??? ?}?? ??? ??? ?else{?? ??? ??? ??? ?mames.innerHTML='OK!'?? ??? ??? ??? ?}?? ??? ??? ?}?? ?}如題這段代碼是跟著慕課江老師的課程寫的，然而 如果驗證不通過 點擊提交按鈕的時候怎樣阻止提交呢？