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tiny progress on dependency-injection.

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Rex 2016-04-26 17:09:37 +01:00
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public/docs/ts/latest/cookbook/dependency-injection.jade
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@ -679,15 +679,19 @@ a(id='useclass')
The alternative could implement a different strategy, extend the default class, The alternative could implement a different strategy, extend the default class,
or fake the behavior of the real class in a test case. or fake the behavior of the real class in a test case.
使用此项技术来为公共或默认类***提供候选实现***。该候选方法能实现一个不同的策略，拓展默认类，或者在测试的时候假冒正真类的行为。
We see two examples in the `HeroOfTheMonthComponent`: We see two examples in the `HeroOfTheMonthComponent`:
请看下面`HeroOfTheMonthComponent`里的两个例子：
+makeExample('cb-dependency-injection/ts/app/hero-of-the-month.component.ts','use-class')(format='.') +makeExample('cb-dependency-injection/ts/app/hero-of-the-month.component.ts','use-class')(format='.')
:marked :marked
The first provider is the *de-sugared*, expanded form of the most typical case in which the The first provider is the *de-sugared*, expanded form of the most typical case in which the
class to be created (`HeroService`) is also the provider's injection token. class to be created (`HeroService`) is also the provider's injection token.
We wrote it in this long form to de-mystify the preferred short form. We wrote it in this long form to de-mystify the preferred short form.
第一个provider是*无语法糖的*，几乎所有典型的provider拓展的形式
The second provider substitutes the `DateLoggerService` for the `LoggerService`. The second provider substitutes the `DateLoggerService` for the `LoggerService`.
The `LoggerService` is already registered at the `AppComponent` level. The `LoggerService` is already registered at the `AppComponent` level.
When _this component_ requests the `LoggerService`, it receives the `DateLoggerService` instead. When _this component_ requests the `LoggerService`, it receives the `DateLoggerService` instead.