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Dependency Injection is a powerful pattern for managing code dependencies.
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In this cookbook we will explore many of the features of Dependency Injection (DI) in Angular.
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依赖注入是一个强大的管理代码依赖链的架构模式。在这个“食谱”中，我们会讨论Angular依赖注入的许多特性。
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<a id="toc"></a>
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:marked
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## Table of contents
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## 目录
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[Application-wide dependencies](#app-wide-dependencies)
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[应用程序全范围依赖](#app-wide-dependencies)
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[External module configuration](#external-module-configuration)
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[外部模块设置](#external-module-configuration)
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[*@Injectable* and nested service dependencies](#nested-dependencies)
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[*@Injectable*和嵌套服务的依赖](#nested-dependencies)
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[Limit service scope to a component subtree](#service-scope)
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[服务作用范围限制在一个组件数内](#service-scope)
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[Multiple service instances (sandboxing)](#multiple-service-instances)
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[多个服务实例(sandboxing)](#multiple-service-instances)
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[Qualify dependency lookup with *@Optional* and *@Host*](#qualify-dependency-lookup)
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[ 使用*@Optional*和*@Host*装饰来调用依赖](#qualify-dependency-lookup)
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[Inject the component's DOM element](#component-element)
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[注入组件的DOM元素](#component-element)
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[Define dependencies with providers](#providers)
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[使用提供者（providers）定义依赖](#providers)
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* [The *provide* function](#provide)
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* [*提供者provide*功能](#provide)
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* [useValue - the *value provider*](#usevalue)
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* [useClass - the *class provider*](#useclass)
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* [useExisting - the *alias provider*](#useexisting)
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@ -3,29 +3,50 @@ include ../_util-fns
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// #docregion cookbook
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:marked
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# Angular 2 Cookbook
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# Angular 2 Cookbook
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The *Cookbook* offers answers to common implementation questions.
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这个*“烹饪书”*提供常见应用问题的答案。
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Each cookbook chapter is a collection of recipes focused on a particular Angular 2 feature or application challenge
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such as data binding, cross-component interaction, and communicating with a remote server via HTTP.
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每个“烹饪书”章节都是一套“食谱”，它们都是针对一个特定的Angular 2特征或者应用挑战，比如数据绑定、跨越组件交互和通过HTTP来与远程服务器交互等。
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.l-sub-section
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:marked
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The cookbook is just getting started. Many more recipes are on the way.
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本Cookbook只是一个开始。更多“食谱”正在编写中。
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:marked
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Each cookbook chapter links to a live sample with every recipe included.
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每个“烹饪书”章节都链接了一个在线例子，它包含了每个“食谱”。
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Recipes are deliberately brief and code-centric.
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“食谱”都是有意的简略和以代码为中心。
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Each recipe links to a chapter of the Developer Guide or the API Guide
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每个“食谱”都与开发者指南或者API指南里面的一章相关联。
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where you can learn more about the purpose, context, and design choices behind the code snippets.
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（在这些关联章节里）你可以学到更多关于代码片段后面目的、前后关系和设计选择等。
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## Feedback
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The cookbook is a perpetual *work-in-progress*.
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这个“烹饪书”是一个持续的*正在进行中*的工作。
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We welcome feedback! Leave a comment by clicking the icon in upper right corner of the banner.
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我们欢迎你的反馈！点击横幅右上角下面的图标来留言。
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Post *documentation* issues and pull requests on the
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[angular.io](https://github.com/angular/angular.io) github repository.
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在[angular.io](https://github.com/angular/angular.io) github仓库提交*文档*议题和Pull requests。
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Post issues with *Angular 2 itself* to the [angular](https://github.com/angular/angular) github repository.
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在[angular](https://github.com/angular/angular)提交*Angular 2 自己*的议题。
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// #enddocregion cookbook
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