little more di review.
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@ -614,13 +614,14 @@ figure.image-display
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We get a service from a dependency injector by giving it a ***token***.
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我们从一个依赖注入器,通过给他一个***令牌(token)***来获取一个服务。
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我们通过给依赖注入器提供***令牌(token)***来获取服务。
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We usually let Angular handle this transaction for us by specifying a constructor parameter and its type.
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The parameter type serves as the injector lookup *token*.
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Angular passes this token to the injector and assigns the result to the parameter.
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Here's a typical example:
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我们通常在构造函数的参数里面,制定一个参数给对应的类型,让Angular来处理该过程(依赖注入)。该参数类型是我们注入器寻找的*令牌*。
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我们通常在构造函数的参数里面,指定一个参数给对应的类型,让Angular来处理依赖注入。该参数类型是依赖注入器需要的*令牌*。
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Angular把该令牌传递给注入器,然后把结果赋给参数。下例是一个典型的例子:
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+makeExample('cb-dependency-injection/ts/app/hero-bios.component.ts','ctor','app/hero-bios.component.ts (component constructor injection)')(format='.')
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@ -628,16 +629,18 @@ figure.image-display
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Angular asks the injector for the service associated with the `LoggerService` and
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and assigns the returned value to the `logger` parameter.
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Angular找注入器要`LoggerService`对应的服务,并将返回的值赋值给`logger`参数。
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Angular找注入器要与`LoggerService`对应的服务,并将返回的值赋值给`logger`参数。
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Where did the injector get that value?
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It may already have that value in its internal container.
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It it doesn't, it may be able to make one with the help of a ***provider***.
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A *provider* is a recipe for delivering a service associated with a *token*.
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注入器在哪儿得到的返回值?
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它可能在自己内部容器里已经有该值了。
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如果它没有,他可能能在***供应商***的帮助下新建一个。
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一个*供应商*是一个通过指令派送对应的服务方法。
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注入器在哪儿得到的依赖?
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它可能在自己内部容器里已经有该依赖了。
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如果它没有,它可能能在***供应商***的帮助下新建一个。
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*供应商*是通过令牌派送对应服务的方法。
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.l-sub-section
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:marked
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If the injector doesn't have a provider for the requested *token*, it delegates the request
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