447 lines
15 KiB
Markdown
447 lines
15 KiB
Markdown
# Setup for local development
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# 搭建本地开发环境
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{@a develop-locally}
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The <live-example name=quickstart>QuickStart live-coding</live-example> example is an Angular _playground_.
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It's not where you'd develop a real application.
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You [should develop locally](guide/setup#why-locally "Why develop locally") on your own machine ... and that's also how we think you should learn Angular.
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<live-example name=quickstart>《快速上手》在线编程</live-example>例子是 Angular 的*游乐场*。
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它不是开发真实应用的地方。
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你应该在自己的电脑上[本地开发](guide/setup#why-locally "为什么在本地开发？")... 你也应该在本地环境学习 Angular。
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Setting up a new project on your machine is quick and easy with the **QuickStart seed**,
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maintained [on github](https://github.com/angular/quickstart "Install the github QuickStart repo").
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利用 [github 上](https://github.com/angular/quickstart "安装 github 《快速上手》库")的**《快速上手》种子**在你的电脑上搭建一个新项目是很快很容易的。
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Make sure you have [node and npm installed](guide/setup#install-prerequisites "What if you don't have node and npm?").
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确定你已经安装了 [node 和 npm](guide/setup#install-prerequisites "如果你没有 node 和 npm？")。
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{@a clone}
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## Clone
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## 克隆
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Perform the _clone-to-launch_ steps with these terminal commands.
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运行下列命令来执行*克隆并启动*步骤。
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<code-example language="sh" class="code-shell">
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git clone https://github.com/angular/quickstart.git quickstart
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cd quickstart
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npm install
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npm start
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</code-example>
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<div class="alert is-important">
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`npm start` fails in _Bash for Windows_ in versions earlier than the Creator's Update (April 2017).
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在*Bash for Windows*中 `npm start` 可能会失败，因为到 2017-01 为止它还不支持访问网络上的服务器。
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</div>
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{@a download}
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## Download
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## 下载
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<a href="https://github.com/angular/quickstart/archive/master.zip" title="Download the QuickStart seed repository">Download the QuickStart seed</a>
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and unzip it into your project folder. Then perform the remaining steps with these terminal commands.
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<a href="https://github.com/angular/quickstart/archive/master.zip" title="下载《快速上手》种子库">下载《快速上手》种子</a>
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并解压到你的项目目录中。然后执行下面的命令完成剩余步骤。
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<code-example language="sh" class="code-shell">
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cd quickstart
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npm install
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npm start
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</code-example>
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<div class="alert is-important">
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`npm start` fails in _Bash for Windows_ in versions earlier than the Creator's Update (April 2017).
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在*Bash for Windows*中 `npm start` 可能会失败，因为到 2017-01 为止它还不支持访问网络上的服务器。
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</div>
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{@a non-essential}
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## Delete _non-essential_ files (optional)
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## 删除*非必需*文件（可选）
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You can quickly delete the _non-essential_ files that concern testing and QuickStart repository maintenance
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(***including all git-related artifacts*** such as the `.git` folder and `.gitignore`!).
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你可以快速删除一些涉及到测试和维护快速开始版本库的 *非必需* 文件
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（***包括所有 git 相关的文件***如 `.git` 文件夹和 `.gitignore`！）。
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<div class="alert is-important">
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Do this only in the beginning to avoid accidentally deleting your own tests and git setup!
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请只在开始时执行此删除操作，以防你自己的测试和 git 文件被意外删除！
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</div>
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Open a terminal window in the project folder and enter the following commands for your environment:
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在项目目录下打开一个终端窗口，并根据你的操作系统执行以下命令：
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### OS/X (bash)
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<code-example language="sh" class="code-shell">
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xargs rm -rf < non-essential-files.osx.txt
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rm src/app/*.spec*.ts
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rm non-essential-files.osx.txt
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</code-example>
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### Windows
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<code-example language="sh" class="code-shell">
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for /f %i in (non-essential-files.txt) do del %i /F /S /Q
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rd .git /s /q
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rd e2e /s /q
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</code-example>
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{@a seed}
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## What's in the QuickStart seed?
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## 《快速上手》种子库里都有什么？
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The **QuickStart seed** contains the same application as the QuickStart playground.
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But its true purpose is to provide a solid foundation for _local_ development.
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Consequently, there are _many more files_ in the project folder on your machine,
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most of which you can [learn about later](guide/setup-systemjs-anatomy "Setup Anatomy").
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**《快速上手》种子** 包含了与《快速上手》游乐场一样的应用，但是，它真正的目的是提供坚实的*本地*开发基础。
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所以你的电脑里的项目目录里面有*更多文件*，参见[搭建剖析](guide/setup-systemjs-anatomy "Setup Anatomy")。
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{@a app-files}
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Focus on the following three TypeScript (`.ts`) files in the **`/src`** folder.
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注意**`/src`**目录中以下三个 TypeScript (`.ts`) 文件：
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<div class='filetree'>
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<div class='file'>
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src
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</div>
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<div class='children'>
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<div class='file'>
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app
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</div>
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<div class='children'>
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<div class='file'>
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app.component.ts
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</div>
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<div class='file'>
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app.module.ts
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</div>
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</div>
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<div class='file'>
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main.ts
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</div>
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</div>
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</div>
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<code-tabs>
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<code-pane title="src/app/app.component.ts" path="setup/src/app/app.component.ts">
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</code-pane>
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<code-pane title="src/app/app.module.ts" path="setup/src/app/app.module.ts">
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</code-pane>
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<code-pane title="src/main.ts" path="setup/src/main.ts">
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</code-pane>
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</code-tabs>
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All guides and cookbooks have _at least these core files_.
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Each file has a distinct purpose and evolves independently as the application grows.
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所有指南和烹饪书都至少有*这几个核心文件*。每个文件都有独特的用途，并且随着应用的成长各自独立演变。
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Files outside `src/` concern building, deploying, and testing your app.
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They include configuration files and external dependencies.
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`src/` 目录之外的文件为构建、部署和测试 app 相关的文件，他们只包括配置文件和外部依赖。
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Files inside `src/` "belong" to your app.
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Add new Typescript, HTML and CSS files inside the `src/` directory, most of them inside `src/app`,
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unless told to do otherwise.
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`src/` 目录下的文件才“属于”你的 app。
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除非明确指出，否则教程中添加的 TypeScript，HTML 和 CSS 文件都在 `src/` 目录下，
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大多数在 `src/app` 目录中。
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The following are all in `src/`
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`src/` 目录文件详情如下：
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<style>
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td, th {vertical-align: top}
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</style>
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<table width="100%">
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<col width="20%">
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</col>
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<col width="80%">
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</col>
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<tr>
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<th>
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File
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文件
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</th>
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<th>
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Purpose
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用途
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</th>
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</tr>
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<tr>
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<td>
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<code>app/app.component.ts</code>
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</td>
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<td>
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Defines the same `AppComponent` as the one in the QuickStart playground.
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It is the **root** component of what will become a tree of nested components
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as the application evolves.
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定义与《快速上手》游乐场同样的 `AppComponent`。
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它是**根**组件，随着应用的演变，它将变成一颗嵌套组件树。
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</td>
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</tr>
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<tr>
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<td>
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<code>app/app.module.ts</code>
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</td>
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<td>
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Defines `AppModule`, the [root module](guide/bootstrapping "AppModule: the root module") that tells Angular how to assemble the application.
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Right now it declares only the `AppComponent`.
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Soon there will be more components to declare.
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定义 `AppModule`，[根模块](guide/bootstrapping "AppModule: 根模块")为 Angular 描述如何组装应用。
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目前，它只声明了 `AppComponent`。
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不久，它将声明更多组件。
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</td>
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</tr>
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<tr>
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<td>
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<code>main.ts</code>
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</td>
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<td>
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Compiles the application with the [JIT compiler](guide/glossary#jit) and
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[bootstraps](guide/bootstrapping)
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the application's main module (`AppModule`) to run in the browser.
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The JIT compiler is a reasonable choice during the development of most projects and
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it's the only viable choice for a sample running in a _live-coding_ environment like Stackblitz.
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You'll learn about alternative compiling and [deployment](guide/deployment) options later in the documentation.
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使[即时 (JIT) 编译器](guide/glossary#jit)用编译应用并且在浏览器中[启动](guide/bootstrapping "启动应用")并运行应用。
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对于大多数项目的开发，这都是合理的选择。而且它是在像 Stackblitz 这样的*在线编程*环境中运行例子的唯一选择。
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你将在本文档中学习其他编译和开发选择。
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</td>
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</tr>
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</table>
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<div class="l-sub-section">
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### Next Step
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### 下一步
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If you're new to Angular, we recommend you follow the [tutorial](tutorial "Tour of Heroes tutorial").
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如果你是 Angular 初学者，建议跟着[教程](tutorial "《英雄指南》教程")学习。
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</div>
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<br></br><br></br>
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{@a install-prerequisites}
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## Appendix: node and npm
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## 附录：node 与 npm
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Node.js and npm are essential to modern web development with Angular and other platforms.
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Node powers client development and build tools.
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The _npm_ package manager, itself a _node_ application, installs JavaScript libraries.
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Node.js 和 npm 对使用 Angular 和其他平台进行现代网络开发是至关重要的。
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Node 驱动客户端开发和构建工具。
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*npm* 包管理器本身是 *node* 应用，用于安装 JavaScript 库。
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<a href="https://docs.npmjs.com/getting-started/installing-node" target="_blank" title="Installing Node.js and updating npm">Get them now</a> if they're not already installed on your machine.
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如果你的电脑没有安装它们，请<a href="https://docs.npmjs.com/getting-started/installing-node" target="_blank" title="安装 Node.js 和更新 npm">现在安装</a>。
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**Verify that you are running node `v4.x.x` or higher and npm `3.x.x` or higher**
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by running the commands `node -v` and `npm -v` in a terminal/console window.
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Older versions produce errors.
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在终端/控制器窗口运行命令 `node -v` 和 `npm -v`，来**确认你运行的 node 是 `v4.x.x` 或更高，npm 为 `3.x.x` 或更高。**
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老版本会产生错误。
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We recommend [nvm](https://github.com/creationix/nvm) for managing multiple versions of node and npm.
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You may need [nvm](https://github.com/creationix/nvm) if you already have projects running on your machine that
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use other versions of node and npm.
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我们推荐使用 [nvm](https://github.com/creationix/nvm) 来管理多版本 node 和 npm。
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如果你的电脑上已经有使用其他版本 node 和 npm 的项目，你可能需要 nvm。
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{@a why-locally}
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## Appendix: Why develop locally
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## 附录：为何在本地开发
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<live-example title="QuickStart Seed in Stackblitz">Live coding</live-example> in the browser is a great way to explore Angular.
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在浏览器中<live-example title="QuickStart Seed in Stackblitz">在线编程</live-example>是很好的探索 Angular 的方法。
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Links on almost every documentation page open completed samples in the browser.
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You can play with the sample code, share your changes with friends, and download and run the code on your own machine.
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几乎每章文档里面的链接都在浏览器中打开完整的例子。
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你可以用这些代码做实验，或者与朋友共享你的修改，或者下载并在你自己的电脑上运行这些代码。
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The [QuickStart](guide/quickstart "Angular QuickStart Playground") shows just the `AppComponent` file.
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It creates the equivalent of `app.module.ts` and `main.ts` internally _for the playground only_.
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so the reader can discover Angular without distraction.
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The other samples are based on the QuickStart seed.
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[快速上手](guide/quickstart "Angular 快速起步游乐场")仅仅展示了 `AppComponent` 文件。
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它在内部创建了只为*游乐场*而准备的等价 `app.module.ts` 和 `main.ts`。
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所以读者可以在零干扰的情况下探索 Angular。
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其他例子是基于 《快速上手》种子的。
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As much fun as this is ...
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虽然有这么多的乐趣，但是...
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* you can't ship your app in Stackblitz
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你不能在 Stackblitz 里面发布你的应用
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* you aren't always online when writing code
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编程时你不可能总是在线
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* transpiling TypeScript in the browser is slow
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在浏览器中编译 TypeScript 很慢
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* the type support, refactoring, and code completion only work in your local IDE
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只有本地 IDE 有类型支持、代码重构和代码自动完成
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Use the <live-example title="QuickStart Seed in Stackblitz">live coding</live-example> environment as a _playground_,
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a place to try the documentation samples and experiment on your own.
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It's the perfect place to reproduce a bug when you want to
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<a href="https://github.com/angular/angular/issues/new" title="File a documentation issue">file a documentation issue</a> or
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<a href="https://github.com/angular/angular/issues/new" title="File an Angular issue">file an issue with Angular itself</a>.
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把<live-example title="QuickStart Seed in Stackblitz">在线编程</live-example>环境当做*游乐场*，一个尝试文档例子和自己做实验的地方。
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当你想要<a href="https://github.com/angular/angular.io/issues/new" target="_blank" title="提交关于文档的问题">提交关于文档的问题</a>或者
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<a href="https://github.com/angular/angular/issues/new" target="_blank" title="提交关于 Angular 的问题">提交关于 Angular 自身的问题</a>时，
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它是重现错误的完美地方。
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For real development, we strongly recommend [developing locally](guide/setup#develop-locally).
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对于现实项目开发，我们强烈推荐在[本地开发](guide/setup#develop-locally)。
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## Appendix: develop locally with IE
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## 附录：使用 IE 进行本地开发
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If you develop angular locally with `ng serve`, there will be `websocket` connection being setup automatically between browser and local dev server, so when your code change, browser can automatically refresh.
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如果你使用 `ng serve` 进行本地开发，就会在浏览器和本地开发服务器之间自动建立一个 `WebSocket` 连接，因此，当你的代码变化时，浏览器也会自动刷新。
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In windows, by default one application can only have 6 websocket connections, <a href="https://msdn.microsoft.com/library/ee330736%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396#websocket_maxconn" title="MSDN WebSocket settings">MSDN WebSocket Settings</a>.
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So if IE was refreshed manunally or automatically by `ng serve`, sometimes, the websocket will not close properly, when websocket connections exceed limitations, `SecurityError` will be thrown, this error will not affect the angular application, you can just restart IE to clear this error, or modify the windows registry to update the limitations.
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在 Windows 中，默认情况下一个应用只能有六个 WebSocket 连接，参见 <a href="https://msdn.microsoft.com/library/ee330736%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396#websocket_maxconn" title="MSDN WebSocket settings">MSDN 中的 WebSocket 设置部分</a>。
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所以，如果 IE 手动刷新或被 `ng serve` 触发了自动刷新，有时候 WebSocket 可能无法正常关闭，当 WebSocket 的连接数超限时，就会抛出 `SecurityError` 异常。请放心，这个异常对 Angular 应用没什么影响，你重启一下 IE 就能消除这个错误，或者修改 Windows 注册表来修改这个上限。
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