回车验证信息

<script type="text/javascript">
    function Cancle() {
        $("#username").val("");
        $("#userpwd").val("");
    }

    //文本框校验
    $(function () {
        //回车就能触发验证提交表单
        $(document).keydown(function (e) {

            var code = e.keyCode;
            if (code == 13) {
                CheckUser();
            }
        });
    });

    function CheckUser() {
        var loginID = jQuery("#username").val();
        var pwd = jQuery("#userpwd").val();
        if (checkdata(jQuery("#frmLogin"))) {
            jQuery.ajaxSetup({ cache: false });
            var result = jQuery.ajax({
                url: "/Sys/logincheck.aspx",
                type: 'GET',
                async: false,
                data: { loginID: loginID, password: pwd },
                success: function (data) {
                    return data;
                }
            });
            if (result.responseText == "N") {
                alert("用户名或密码错误！");
            }
            else {
                window.location.href = "/Default/Index.aspx";
            }
        }
    }
</script>