创建服务方法时，module.service 和 module.factory 有什么区别

问题描述

我不知道什么是最佳实践以及我应该使用什么.

I don't know what is the best practice and what I should use.

以下两种方法有什么区别?

What is the difference between below two methods?

module.service(..);

和

module.factory(..);

推荐答案

Pawel Kozlowski 在 Google 小组中发布了一篇很棒的帖子:

There is a great google group post about this from Pawel Kozlowski:

https://groups.google.com/forum/#!msg/angular/hVrkvaHGOfc/idEaEctreMYJ

引自鲍威尔:

实际上 $provide.provider, $provide.factory 和 $provide.service 是从某种意义上说，它们或多或少是相同的创建对象实例的蓝图/说明(那些然后准备好将实例注入到协作者中).

$provide.provider 是最复杂的注册方法蓝图，它可以让你有一个复杂的创建功能和配置选项.

$provide.provider is the most spohisticated method of registering blueprints, it allows you to have a complex creation function and configuration options.

$provide.factory 是 $provide.provider 的简化版本不需要支持配置选项但仍然想要一个更复杂的创建逻辑.

$provide.factory is a simplified version of $provide.provider when you don't need to support configuration options but still want to have a more sophisticated creation logic.

$provide.service 用于整个创建逻辑沸腾的情况归结为调用构造函数.

$provide.service is for cases where the whole creation logic boils down to invoking a constructor function.

因此，根据您的构造逻辑的复杂性，您将选择 $provide.provider、$provide.factory 和 $provide.service 之一但最终你会得到一个新的实例.

So, depending on the complexity of your construction logic you would choose one of $provide.provider, $provide.factory and $provide.service but in the end what you are going to get is a new instance.

这是随附的小提琴演示(来自线程):http://jsfiddle.net/pkozlowski_opensource/PxdSP/14/

Here is the accompanying fiddle to demonstrate (from the thread): http://jsfiddle.net/pkozlowski_opensource/PxdSP/14/

和代码:

var myApp = angular.module('myApp', []);

//service style, probably the simplest one
myApp.service('helloWorldFromService', function() {
    this.sayHello = function() {
        return "Hello, World!"
    };
});

//factory style, more involved but more sophisticated
myApp.factory('helloWorldFromFactory', function() {
    return {
        sayHello: function() {
            return "Hello, World!"
        }
    };
});

//provider style, full blown, configurable version     
myApp.provider('helloWorld', function() {

    this.name = 'Default';

    this.$get = function() {
        var name = this.name;
        return {
            sayHello: function() {
                return "Hello, " + name + "!"
            }
        }
    };

    this.setName = function(name) {
        this.name = name;
    };
});

//hey, we can configure a provider!            
myApp.config(function(helloWorldProvider){
    helloWorldProvider.setName('World');
});


function MyCtrl($scope, helloWorld, helloWorldFromFactory, helloWorldFromService) {

    $scope.hellos = [
        helloWorld.sayHello(),
        helloWorldFromFactory.sayHello(),
        helloWorldFromService.sayHello()];
}

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