通常，在AngularJS中使用JSON作为存储数据的模型。我们可能这样在controller中写model：
app.controller('BookController',['$scope',function($scope){ $scope.book = { id:1, name:'', author:'', stores:[ {id:1, name:'', quantity:2}, {id:2, name:'', quantity:2}, ... ] };}])
在视图中也许这样用到这个model:
当我们需要从服务端获取数据的时候，可能这样写：
app.controller('BookController',['$scope', '$http', function($scope, $http){ var bookId = 1; $http.get('api/books'+bookId).success(function(bookData){ $scope.book = bookData; }) $scope.deleteBook = function(){ $http.delete('api/books/' + bookId); } $scope.updateBook = function(){ $http.put('api/books/'+bookId, $scope.book); } $scope.getBookImageUrl = function(width, height){ return 'our/iamge/service' +bookId + '/width/height'; } $scope.isAvailable = function(){ if(!$scope.book.stores || $scope.book.stores.length === 0){ return false; } reutrn $scope.book.stores.some(function(store){ return store.quantity > 0; }) }}])
在视图中可能这样使用：
is available:
以上，JSON格式的model只能在BookController中使用，如何在其他controller中也可以使用呢？
--通过factory方式
app.factory('Book', ['$http', function($http){ function Book(bookData){ if(bookData){ this.setData(bookData); } } Book.prototype = { setData: function(bookData){ angular.extend(this, bookData); }, load: function(id){ var scope = this; $http.get('api/books/' + bookId).success(function(bookData){ scope.setData(bookData); }) }, delete: function(bookId){ $http.delete('api/books/' + bookId); }, update: function(bookId){ $http.put('api/books/' + bookId, this); }, getImageUrl: function(width, height){ return 'our/image/service/' + this.book.id + '/' + width + '/' + height; }, isAvailable: funciton(){ if(!this.book.stores || this.book.stores.length === 0) { return false; } return this.book.stores.some(function(store){ return store.quantity > 0; }) } } return Book;}])
以上，通过factory的方式创建了类似Book的一个Data Model，现在可以注入到controller中去了。
app.controller('BookController', ['$scope', 'Book', function($scope, Book){ $scope.book = new Book(); $scope.book.load(1);}])
在视图中也会有相应的变化。
is abailble:
以上，多个controller可以使用同一个有关book的Data Model了，如果多个controller处理同一个有关book的Data Model呢？
app.factory('booksManager', ['$http', '$q', 'Book', function($http. $q, Book){ var booksManager = { _pool: {}, _retrieveInstance: function(bookId, bookData){ var instance = this._pool[bookId]; if(instance){ instance.setData(bookData); } else { instance = new Book(bookData); this._pool[bookId] = instance; } return instance; }, _seach: function(bookId){ reutrn this_.pool[bookId]; }, _load: function(bookId, deferred){ var scope = this; $http.get('api/books/' + bookId) .success(funciton(bookData){ var book = scope._retrieveInstance(bookData.id, bookData); deferred.resolve(book); }) .error(function(){ deferred.reject(); }) }, getBook: function(bookId){ var deferred = $q.defer(); var book = this._search(bookId); if(book){ deferred.resove(book); } else { this._load(bookId, deferred); } return deferred.promise; }, loadAllBooks: function(){ var deferred = $q.defer(); var scope = this; $http.get('api/books') .success(function(booksArray){ var books = []; booksArray.forEach(function(bookData){ var book = scope.l_retrieveInstance(bookData.id, bookData); books.push(book); }); deferred.resolve(books); }) .error(function(){ deferred.reject(); }); return deferred.promise; }， setBook: function(bookData){ var scope = this; var book = this._search(bookData.id); if(book){ book.setData(bookData); } else { book = scope._retrieveInstance(bookData); } return book; } }; return booksManager;}])
Book服务去掉load方法。
app.factory('Book', ['$http', function($http) { function Book(bookData) { if (bookData) { this.setData(bookData): } // Some other initializations related to book }; Book.prototype = { setData: function(bookData) { angular.extend(this, bookData); }, delete: function() { $http.delete('ourserver/books/' + bookId); }, update: function() { $http.put('ourserver/books/' + bookId, this); }, getImageUrl: function(width, height) { return 'our/image/service/' + this.book.id + '/width/height'; }, isAvailable: function() { if (!this.book.stores || this.book.stores.length === 0) { return false; } return this.book.stores.some(function(store) { return store.quantity > 0; }); } }; return Book;}]); 现在，多个controller可以使用同一个booksManager服务。
app .controller('EditableBookController',['$scope', 'booksManager', function($scope, booksManager){ booksManager.getBook(1).then(function(book){ $scope.book = book; }) }]) .controller('BooksListController',['$scope', 'booksManager', function($scope, booksManager){ booksManager.loadAllBooks().then(function(books){ $scope.books = books; }) }])
参考：http://www.webdeveasy.com/angularjs-data-model/