「本」的JavaScript函數中的上下文關鍵字

Question

我只是想知道的「this」關鍵字是指在下面的函數的上下文是什麼：

function EditCtrl($scope, $location, $routeParams, Project) { 
    var self = this; 

    Project.get({id: $routeParams.projectId}, function(project) { 
    self.original = project; 
    $scope.project = new Project(self.original); 
    }); 

    $scope.isClean = function() { 
    return angular.equals(self.original, $scope.project); 
    } 

    $scope.destroy = function() { 
    self.original.destroy(function() { 
     $location.path('/list'); 
    }); 
    }; 

    $scope.save = function() { 
    $scope.project.update(function() { 
     $location.path('/'); 
    }); 
    }; 
} 

特別是，我還以爲「this」提到EditCtrl功能，但console.log(typeof this);打印object !!!

上述片段是從http://angularjs.org/#project-js

EDIT採取：以下是完整的代碼。我很抱歉：我應該在第一時間已包括它...

angular.module('project', ['mongolab']). 
    config(function($routeProvider) { 
    $routeProvider. 
     when('/', {controller:ListCtrl, templateUrl:'list.html'}). 
     when('/edit/:projectId', {controller:EditCtrl, templateUrl:'detail.html'}). 
     when('/new', {controller:CreateCtrl, templateUrl:'detail.html'}). 
     otherwise({redirectTo:'/'}); 
    }); 


function ListCtrl($scope, Project) { 
    $scope.projects = Project.query(); 
} 


function CreateCtrl($scope, $location, Project) { 
    $scope.save = function() { 
    Project.save($scope.project, function(project) { 
     $location.path('/edit/' + project._id.$oid); 
    }); 
    } 
} 


function EditCtrl($scope, $location, $routeParams, Project) { 
    var self = this; 

    Project.get({id: $routeParams.projectId}, function(project) { 
    self.original = project; 
    $scope.project = new Project(self.original); 
    }); 

    $scope.isClean = function() { 
    return angular.equals(self.original, $scope.project); 
    } 

    $scope.destroy = function() { 
    self.original.destroy(function() { 
     $location.path('/list'); 
    }); 
    }; 

    $scope.save = function() { 
    $scope.project.update(function() { 
     $location.path('/'); 
    }); 
    }; 
} 

Answer 1

我會假設該函數實際上是一個對象，這意味着要實例化。我想你會在代碼中找到類似var myeditctrl = new EditControl（...）的地方。在這種情況下，這是指myeditctrl對象。

Answer 2

Normamally this指在一個函數被調用

在這裏，你的情況，因爲它似乎的背景下，這個功能是一個獨立的本身，所以this意味着當前的瀏覽器窗口/文檔