javascript验证邮箱格式代码

用一个正侧表达式在javascript中验证就是咯!
<script language='javascript'>
function chkMail(){
if(document.form1.email.value=''){
alert("请填写邮箱地址!");
document.form1.email.focus();
return false;
}
//开始验证
var email = document.form1.email.value;
var pattern = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
chkFlag = pattern.test(email);
if(chkFlag){
return true;
}
else
{
alert("邮箱地址的格式不正确！");
document.form1.email.focus();
return false;
}
}
</script>
~~~~~~~~~~~~~~~~~~~~~~~完毕！
最简单的就一句：
if(!/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test('email'))
{
alert('email不正确');
}
----------------------------------------------------------------------------------------------------------------------------
js:
function isEmail(email)
{
invalidChars = " /;,:{}[]|*%$#!()`<>?";
if (email == "")
{
return false;
}
for (i=0; i< invalidChars.length; i++)
{
badChar = invalidChars.charAt(i)
if (email.indexOf(badChar,0) > -1) {
return false;
}
}
atPos = email.indexOf("@",1)
if (atPos == -1) {   return false; }
if (email.indexOf("@", atPos+1) != -1) {   return false; }
periodPos = email.indexOf(".",atPos)
if(periodPos == -1) {
return false; // and at least one "." after the "@"
}
if ( atPos +2 > periodPos) {
return false; // and at least one character between "@" and "."
}
if ( periodPos +3 > email.length) {   return false; }
return true;
}
aspx: 调用:
<input id=zz><input type=button value=check onclick="if(isEmail(zz.value))alert('正确');else alert('错误')">