Good tools make application development quicker and easier to maintain than
if you did everything by hand.
好的工具能让开发更加简单快捷。
The Angular CLI is a command line interface tool
that can create a project, add files, and perform a variety of ongoing development tasks such
as testing, bundling, and deployment.
The goal in this guide is to build and run a simple Angular
application in TypeScript, using the Angular CLI
while adhering to the Style Guide recommendations that
benefit every Angular project.
By the end of the chapter, you'll have a basic understanding of development with the CLI
and a foundation for both these documentation samples and for real world applications.
Verify that you are running at least node 6.9.x and npm 3.x.x
by running node -v and npm -v in a terminal/console window.
Older versions produce errors, but newer versions are fine.
The CLI created the first Angular component for you.
This is the root component and it is named app-root.
You can find it in ./src/app/app.component.ts.
Or you can stick around a bit longer to learn about the files in your brand new project.
或者，你也可以稍等一会儿，学学在这个新项目中的文件都是干什么用的。
Project file review
项目文件概览
An Angular CLI project is the foundation for both quick experiments and enterprise solutions.
Angular CLI项目是做快速试验和开发企业解决方案的基础。
The first file you should check out is README.md.
It has some basic information on how to use CLI commands.
Whenever you want to know more about how Angular CLI works make sure to visit
the Angular CLI repository and
Wiki.
Some of the generated files might be unfamiliar to you.
有些生成的文件你可能觉得陌生。接下来我们就讲讲它们。
The src folder
src文件夹
Your app lives in the src folder.
All Angular components, templates, styles, images, and anything else your app needs go here.
Any files outside of this folder are meant to support building your app.
`app/app.component.{ts,html,css,spec.ts}`
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Defines the `AppComponent` along with an HTML template, CSS stylesheet, and a unit test.
It is the **root** component of what will become a tree of nested components
as the application evolves.
使用HTML模板、CSS样式和单元测试定义`AppComponent`组件。
它是**根**组件，随着应用的成长它会成为一棵组件树的根节点。
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`app/app.module.ts`
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Defines `AppModule`, the [root module](guide/bootstrapping "AppModule: the root module") that tells Angular how to assemble the application.
Right now it declares only the `AppComponent`.
Soon there will be more components to declare.
定义`AppModule`，这个[根模块](guide/bootstrapping "AppModule: 根模块")会告诉Angular如何组装该应用。
目前，它只声明了`AppComponent`。
稍后它还会声明更多组件。
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`assets/*`
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A folder where you can put images and anything else to be copied wholesale
when you build your application.
这个文件夹下你可以放图片等任何东西，在构建应用时，它们全都会拷贝到发布包中。
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`environments/*`
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This folder contains one file for each of your destination environments,
each exporting simple configuration variables to use in your application.
The files are replaced on-the-fly when you build your app.
You might use a different API endpoint for development than you do for production
or maybe different analytics tokens.
You might even use some mock services.
Either way, the CLI has you covered.
这个文件夹中包括为各个目标环境准备的文件，它们导出了一些应用中要用到的配置变量。
这些文件会在构建应用时被替换。
比如你可能在产品环境中使用不同的API端点地址，或使用不同的统计Token参数。
甚至使用一些模拟服务。
所有这些，CLI都替你考虑到了。
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`favicon.ico`
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Every site wants to look good on the bookmark bar.
Get started with your very own Angular icon.
每个网站都希望自己在书签栏中能好看一点。
请把它换成你自己的图标。
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`index.html`
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The main HTML page that is served when someone visits your site.
Most of the time you'll never need to edit it.
The CLI automatically adds all `js` and `css` files when building your app so you
never need to add any `<script>` or `<link>` tags here manually.
这是别人访问你的网站是看到的主页面的HTML文件。
大多数情况下你都不用编辑它。
在构建应用时，CLI会自动把所有`js`和`css`文件添加进去，所以你不必在这里手动添加任何 `<script>` 或 `<link>` 标签。
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`main.ts`
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The main entry point for your app.
Compiles the application with the [JIT compiler](guide/glossary#jit)
and bootstraps the application's root module (`AppModule`) to run in the browser.
You can also use the [AOT compiler](guide/glossary#ahead-of-time-aot-compilation)
without changing any code by passing in `--aot` to `ng build` or `ng serve`.
这是应用的主要入口点。
使用[JIT compiler](guide/glossary#jit)编译器编译本应用，并启动应用的根模块`AppModule`，使其运行在浏览器中。
你还可以使用[AOT compiler](guide/glossary#ahead-of-time-aot-compilation)编译器，而不用修改任何代码 —— 只要给`ng build` 或 `ng serve` 传入 `--aot` 参数就可以了。
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`polyfills.ts`
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Different browsers have different levels of support of the web standards.
Polyfills help normalize those differences.
You should be pretty safe with `core-js` and `zone.js`, but be sure to check out
the [Browser Support guide](guide/browser-support) for more information.
不同的浏览器对Web标准的支持程度也不同。
填充库（polyfill）能帮我们把这些不同点进行标准化。
你只要使用`core-js` 和 `zone.js`通常就够了，不过你也可以查看[浏览器支持指南](guide/browser-support)以了解更多信息。
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`styles.css`
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Your global styles go here.
Most of the time you'll want to have local styles in your components for easier maintenance,
but styles that affect all of your app need to be in a central place.
这里是你的全局样式。
大多数情况下，你会希望在组件中使用局部样式，以利于维护，不过那些会影响你整个应用的样式你还是需要集中存放在这里。
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`test.ts`
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This is the main entry point for your unit tests.
It has some custom configuration that might be unfamiliar, but it's not something you'll
need to edit.
这是单元测试的主要入口点。
它有一些你不熟悉的自定义配置，不过你并不需要编辑这里的任何东西。
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`tsconfig.{app|spec}.json`
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TypeScript compiler configuration for the Angular app (`tsconfig.app.json`)
and for the unit tests (`tsconfig.spec.json`).
TypeScript编译器的配置文件。`tsconfig.app.json`是为Angular应用准备的，而`tsconfig.spec.json`是为单元测试准备的。
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The root folder
根目录
The src/ folder is just one of the items inside the project's root folder.
Other files help you build, test, maintain, document, and deploy the app.
These files go in the root folder next to src/.
`e2e/`
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Inside `e2e/` live the end-to-end tests.
They shouldn't be inside `src/` because e2e tests are really a separate app that
just so happens to test your main app.
That's also why they have their own `tsconfig.e2e.json`.
在`e2e/`下是端到端（end-to-end）测试。
它们不在`src/`下，是因为端到端测试实际上和应用是相互独立的，它只适用于测试你的应用而已。
这也就是为什么它会拥有自己的`tsconfig.json`。
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`node_modules/`
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`Node.js` creates this folder and puts all third party modules listed in
`package.json` inside of it.
`Node.js`创建了这个文件夹，并且把`package.json`中列举的所有第三方模块都放在其中。
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`.angular-cli.json`
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Configuration for Angular CLI.
In this file you can set several defaults and also configure what files are included
when your project is built.
Check out the official documentation if you want to know more.
Angular CLI的配置文件。
在这个文件中，我们可以设置一系列默认值，还可以配置项目编译时要包含的那些文件。
要了解更多，请参阅它的官方文档。
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`.editorconfig`
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Simple configuration for your editor to make sure everyone that uses your project
has the same basic configuration.
Most editors support an `.editorconfig` file.
See http://editorconfig.org for more information.
给你的编辑器看的一个简单配置文件，它用来确保参与你项目的每个人都具有基本的编辑器配置。
大多数的编辑器都支持`.editorconfig`文件，详情参见 http://editorconfig.org 。
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`.gitignore`
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Git configuration to make sure autogenerated files are not commited to source control.
一个Git的配置文件，用来确保某些自动生成的文件不会被提交到源码控制系统中。
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`karma.conf.js`
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Unit test configuration for the [Karma test runner](https://karma-runner.github.io),
used when running `ng test`.
给[Karma](https://karma-runner.github.io)的单元测试配置，当运行`ng test`时会用到它。
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`package.json`
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`npm` configuration listing the third party packages your project uses.
You can also add your own [custom scripts](https://docs.npmjs.com/misc/scripts) here.
`npm`配置文件，其中列出了项目使用到的第三方依赖包。
你还可以在这里添加自己的[自定义脚本](https://docs.npmjs.com/misc/scripts)。
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`protractor.conf.js`
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End-to-end test configuration for [Protractor](http://www.protractortest.org/),
used when running `ng e2e`.
给[Protractor](http://www.protractortest.org/)使用的端到端测试配置文件，当运行`ng e2e`的时候会用到它。
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`README.md`
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Basic documentation for your project, pre-filled with CLI command information.
Make sure to enhance it with project documentation so that anyone
checking out the repo can build your app!
项目的基础文档，预先写入了CLI命令的信息。
别忘了用项目文档改进它，以便每个查看此仓库的人都能据此构建出你的应用。
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`tsconfig.json`
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TypeScript compiler configuration for your IDE to pick up and give you helpful tooling.
TypeScript编译器的配置，你的IDE会借助它来给你提供更好的帮助。
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`tslint.json`
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Linting configuration for [TSLint](https://palantir.github.io/tslint/) together with
[Codelyzer](http://codelyzer.com/), used when running `ng lint`.
Linting helps keep your code style consistent.
给[TSLint](https://palantir.github.io/tslint/)和[Codelyzer](http://codelyzer.com/)用的配置信息，当运行`ng lint`时会用到。
Lint功能可以帮你保持代码风格的统一。
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Next Step
下一步
If you're new to Angular, continue with the
tutorial.
You can skip the "Setup" step since you're already using the Angular CLI setup.
