我在我的应用程序中使用knockout从表单中注册/登录，但第一次ajax调用的等待时间非常慢（猜测之后会缓存，因为第二次登录非常快）-当我将网站上传到在线时，大约需要十五秒才能登录，当我将其包装为iOS应用程序（HTML5应用程序）时，完成登录需要超过六十秒。为什么会发生这种情况？我错过了什么吗？更可能是服务器端的问题吗？希望我可以提供足够的信息，但不幸的是我对此很陌生。我将在下面添加登录代码：
$(document).ready(function(){
function UserViewModel() {
//Make the self as 'this' reference
var self = this;
var Domain = "http://example.com";
//Declare User observables which will be bind with UI
self.UserId = ko.observable();
self.Name = ko.observable();
self.Email = ko.observable();
self.Occupation = ko.observable();
self.Country = ko.observable();
self.RegistrationNumber = ko.observable();
//Create User object
var User = {
UserId: self.UserId,
Name: self.Name,
Email: self.Email,
Occupation: self.Occupation,
Country: self.Country,
RegistrationNumber: self.RegistrationNumber,
};
//Assign knockout observables to User/s objects
self.User = ko.observable(); //user
self.Users = ko.observableArray(); // list of users
//onload set status of user
UserStatus();
//Login handler
self.login = function () {
try {
if (User.Email() != "" && User.RegistrationNumber() != "") {
//try logging in
Login();
} else {
viewModel.UserId("Please login with the correct email and registration number.");
}
}
catch (err) {
viewModel.UserId("There was an error, please try again.");
}
};
//Login
function Login() {
$.ajax({
url: Domain + '/User/Login',
cache: false,
type: 'POST',
dataType: 'json',
contentType: 'application/json; charset=utf-8',
data: '{"Email":"' + User.Email() + '","RegistrationNumber":"' + User.RegistrationNumber() + '"}',
beforeSend: function () {
// setting a timeout
$('.splash').show();
},
success: function (data) {
$('.splash').hide();
if (data != 0) {
SetUserVars(data.UserId, data.Name, data.Email, data.Occupation, data.Country, data.RegistrationNumber);
viewModel.UserId(ActionToTake());
}
else {
viewModel.UserId("The supplied credentials are invalid, please try again.");
}
},
complete: function () {
//$('.splash').hide();
},
}).fail(
function (xhr, textStatus, err) {
console.log(xhr.statusText);
console.log(textStatus);
console.log(err);
viewModel.UserId("There was an error, please try again.");
});
}
function UserStatus() {
if (localStorage.getItem("UserId") === null) {
//not logged in
$("a.menu-status").text("Login").attr("href", "index.html#login-screen");
}
if (localStorage.getItem("UserId") != null) {
//logged in
$("a.menu-status").text("Logout").attr("href", "index.html#login-screen");
}
//allow user to logout and reset all user storage
$("a.menu-status").click(function () {
//show logged off status
$("a.menu-status").text("Login");
alert('You have logged off, please login if you wish to continue.');
self.reset();
//redirect
window.location.replace("index.html#login-screen");
location.reload();
viewModel.UserId("You have logged off.");
ResetUserLocalStorage();
});
}