E-mail校验

if(document.form1.Email.value!=""){
 var objv = document.form1.Email.value;
var pattern = /[^@]+@([a-zA-Z0-9-]+.)+([a-zA-Z0-9-]{2}|net|com|gov|mil|org|edu|int)$/;
flag=pattern.test(objv);
if(!flag)
{
alert( "请留下正确的Email地址！");
document.form1.Email.focus();
return false;

 }