AngularJS错误：[$ injector：unpr]未知提供者：$ timeOutProvider＆lt; - $ timeOut＆lt; - alert

Question

我收到以下错误，不确定原因

  

错误：[$ injector：unpr]未知提供商：$ timeOutProvider＆lt; - $ timeOut   ＆lt; - alert

控制器\ register.js

let versionNumber = NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleShortVersionString") as! String
let buildNumber = NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleVersion") as! String

服务\ alert.js

angular.module('testApp')
  .controller('RegisterCtrl', function ($scope, $rootScope, $http, alert) {
    $scope.submit = function () {

      var url = '/';
      var user = {};

      $http.post(url, user)
        .success(function (res) {
          alert('Success', 'OK!', 'You are now registered');
        })
        .error(function (err){
          alert('warning', 'Oops!', 'could not register');
        });
    };
  });

app.config.js

angular.module('testApp')
  .service('alert', function ($rootScope, $timeOut) {
    var alertTimeout;
    return function(type, title, message, timeout){
      $rootScope.alert = {
        hasBeenShown: true,
        show: true,
        type: type,
        message: message,
        title: title
      };
      $timeOut.cancel(alertTimeout);
      alertTimeout = $timeout(function() {
        $rootScope.alert.show = false;
      }, timeout || 2000);
    }
  });

Answer 1

timeout而非timeOut

.service('alert', function ($rootScope, $timeout) {