angularjs – 什么是类型友好的注射？

>在指令链接功能中按位置
>在指令定义中按名称
>在控制器函数中按名称
>在工厂函数中按名称
>在服务函数中按类型

类型友好的注入允许你通过引用调用构造函数：

myApp.service('Pattern',["Infinity",RegExp]);

而不是通过使用new关键字的explicity：

myApp.factory('Pattern',function(Infinity) 
  {
  return new RegExp(Infinity);
  } 
 ]);

要么

function goInfinity(Infinity)
  {
  return new RegExp(Infinity);
  } 

goInfinity.$inject = ["Infinity"];
myApp.factory('Pattern',goInfinity);

The Service recipe produces a service just like the Value or Factory recipes,but it does so by invoking a constructor with the new operator. The constructor can take zero or more arguments,which represent dependencies needed by the instance of this type.

Eager初始化意味着一个常数配方必须返回一个构造函数，以便使用上述语法：

function RegExpConstant() 
  {
  return new RegExp(Infinity);
  } 

myApp.constant('Pattern',RegExpConstant)

而不是返回函数，对象或字面值。

命名来自Java：

A service is a well-known set of interfaces.
A service provider is a specific implementation of a service.
A factory is an object that returns an object reference to another object

参考文献

> Dependency Injection in Angular 2
> The main goals of Angular 2 and how they will be achieved
> Vojta Jina: Dependency Injection – NG-Conf
> AngularJS: Developer Guide – Providers,Service Recipe
> AngularJS: The Bad Parts
> Dependency Injection: Syntax Sugar Over Function Composition
> ServiceFinder (JAX-WS RI)