常用的js數據格式驗證

<script language="javascript" >
  function sub_mit(frm){
if(frm.username.value==""){
alert("請輸入姓名！");
frm.username.focus();
return (false);
}
if(!isDigit(frm.tel.value)){
alert("聯繫電話必須爲數字");
frm.tel.focus();
return (false);
}
if(!isTel(frm.tel.value)){
alert("手機號碼位數不得少於7位!");
frm.tel.focus();
return (false);
}
if(frm.address.value==""){
alert("請輸入通信地址！");
frm.address.focus();
return (false);
}
if(frm.passWord.value!=frm.passWord2.value){
alert("確認密碼有誤，請重新輸入！");
frm.passWord2.focus();
return (false);
}
if(frm.email.value==""){
alert("請輸入電子郵件！");
frm.email.focus();
return (false);
}
var myRegex = /@.*/.[a-z]{2,6}/;
var email = frm.email.value;
email = email.replace(/^ | $/g,"");
email = email.replace(/^/.*|/.*$/g,"");
email = email.toLowerCase();

//驗證電子郵件的有效性
if (email == "" || !myRegex.test(email)){
alert ("請輸入有效的E-MAIL!");
frm.email.focus();
return (false);
}
frm.action='xx.jsp';
return true;
}
//是否都爲數字
function isDigit(s)
{
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec(s)) return false
return true
}
//驗證電話號碼位數
function isTel(s)
{
return (s.length>=7 && s.length<=11)
}
</script>
<form  name="form1" method="post"  onSubmit="return sub_mit(this)"></form>