js邮件地址验证脚本

<script language="javascript">
function checkmail()
{
    var email=document.all.Email.value
    var pattern=/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
    flag=pattern.test(email);
    if (flag)
    {return true;}
    else
        {
         alert('请输入正确邮箱地址！');
        return false;
        }
}
</script>