function login() {
              var userid = $("#username").val();
              var userpwd = $("#pwd").val();
            if (userid == "") {
                alert("登录失败,请输入账号");
                return;
            }
            if (userpwd == "") {
                alert("登录失败,请输入密码");
                return;
            }
            $.ajax({
                url: "/Home/Login",
                data: { userid: userid, userpwd: userpwd },
                type: "POST",
                success:
                    function (data) {
                        if (data =http://www.mamicode.com/= "ok") {
                            location.href =  "@Url.Action("Index", "Home")"; 
                        }
                        else {
                            alert("登录失败!");
                        }
                    }
            })
              return false;
        }