js判断邮件地址

<asp:TextBox ID="txt_Email" runat="server" onblur="checkRate(this.id)"></asp:TextBox>

 

function checkRate(input)

{
    var re = /^[_".0-9a-z-]+@([0-9a-z][0-9a-z-]+".){1,4}[a-z]{2,3}$/i;  
    var nubmer = document.getElementById(input).value;
    
     if (!re.test(nubmer))
    {
        alert("请输入正确格式的邮件地址");
        document.getElementById(input).value = "";
        return false;
     }
}