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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html" class="active">TypeScript手册</a></li><li class="chapter-item expanded "><a href="00_tsconfig-json.html"><strong aria-hidden="true">1.</strong> tsconfig.json</a></li><li class="chapter-item expanded "><a href="01_basic_data_types.html"><strong aria-hidden="true">2.</strong> 基本数据类型</a></li><li class="chapter-item expanded "><a href="02_variables_declaration.html"><strong aria-hidden="true">3.</strong> 变量声明</a></li><li class="chapter-item expanded "><a href="03_classes.html"><strong aria-hidden="true">4.</strong> 类</a></li><li class="chapter-item expanded "><a href="04_interfaces.html"><strong aria-hidden="true">5.</strong> 接口</a></li><li class="chapter-item expanded "><a href="05_functions.html"><strong aria-hidden="true">6.</strong> 函数</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">进阶</li><li class="chapter-item expanded "><a href="06_generics.html"><strong aria-hidden="true">7.</strong> 泛型</a></li><li class="chapter-item expanded "><a href="07_enums.html"><strong aria-hidden="true">8.</strong> 枚举</a></li><li class="chapter-item expanded "><a href="08_type_inference.html"><strong aria-hidden="true">9.</strong> 类型推导</a></li><li class="chapter-item expanded "><a href="09_type_compatibility.html"><strong aria-hidden="true">10.</strong> 类型兼容性</a></li><li class="chapter-item expanded "><a href="10_advanced_types.html"><strong aria-hidden="true">11.</strong> 高级类型</a></li><li class="chapter-item expanded "><a href="11_symbols.html"><strong aria-hidden="true">12.</strong> 符号</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">高级特性</li><li class="chapter-item expanded "><a href="12_iterators_and_generators.html"><strong aria-hidden="true">13.</strong> 迭代器与生成器</a></li><li class="chapter-item expanded "><a href="13_modules.html"><strong aria-hidden="true">14.</strong> 模块</a></li><li class="chapter-item expanded "><a href="14_namespaces.html"><strong aria-hidden="true">15.</strong> 命名空间</a></li><li class="chapter-item expanded "><a href="15_modules_and_namespaces.html"><strong aria-hidden="true">16.</strong> 模块与命名空间</a></li><li class="chapter-item expanded "><a href="16_module_resolution.html"><strong aria-hidden="true">17.</strong> 模块解析</a></li><li class="chapter-item expanded "><a href="17_declaration_merging.html"><strong aria-hidden="true">18.</strong> 声明的融合</a></li><li class="chapter-item expanded "><a href="18_jsx.html"><strong aria-hidden="true">19.</strong> JSX</a></li><li class="chapter-item expanded "><a href="19_decorators.html"><strong aria-hidden="true">20.</strong> 装饰器</a></li><li class="chapter-item expanded "><a href="20_mixins.html"><strong aria-hidden="true">21.</strong> 混入Mixins</a></li><li class="chapter-item expanded "><a href="21_triple-slash_directives.html"><strong aria-hidden="true">22.</strong> 三斜杠指令</a></li></ol>
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<h1 id="typescript-学习记录"><a class="header" href="#typescript-学习记录">TypeScript 学习记录</a></h1>
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<p>你可以直接在 xfoss.com 阅读本书：<a href="https://ts.xfoss.com/">ts.xfoss.com</a>。xfoss.com 还有其他书籍：</p>
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<ul>
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<li>
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<p><a href="https://rust-lang.xfoss.com">Rust 编程语言</a>，Rust 官方教程中文翻译</p>
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</li>
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<li>
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<p><a href="https://java.xfoss.com">Java 编程语言</a>，"Head First Java" 书中文翻译</p>
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</li>
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<li>
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<p><a href="https://ccna60d.xfoss.com">60天通过CCNA考试</a>，一本基础的网络通讯书，翻译自国外经典 CCNA 60 days</p>
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</li>
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</ul>
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<p>你可以在 https://github.com/gnu4cn/ts-learnings 上 fork 本项目，并提交你的修正。</p>
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<p>ECMAScript 2015 (ES6)已经正式发布，所有浏览器均已支持，同时许多项目，如Angular, Ionic, Electron框架等，均已在往ES6迁移。故需要学习掌握这一新版的Javascript。</p>
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<h2 id="变更日志"><a class="header" href="#变更日志">变更日志</a></h2>
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<ul>
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<li>2019-3-27, 重新整理<code>package.json</code>、<code>tsconfig.json</code>与<code>gulpfile.js</code>文件，让<code>.gitignore</code>生效，令到项目大小得以缩小</li>
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</ul>
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<h2 id="es6与-javascript"><a class="header" href="#es6与-javascript">ES6与 Javascript</a></h2>
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<p>ES6仍然是Javascript, 只不过是在我们已经熟悉的Javascript上加入了一些新的东西。使得Javascript更为强大，可以应对大型程序的要求。</p>
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<h2 id="es6的实现"><a class="header" href="#es6的实现">ES6的实现</a></h2>
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<p>ES6只是新一代Javascript的规范，几大公司、各个浏览器引擎等都有具体的实现。微软TypeScript、社区的CoffeeScript等都是ES6的具体实现。</p>
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<p>参考链接：</p>
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<ul>
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<li>https://blog.mariusschulz.com/2017/01/13/typescript-vs-flow</li>
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<li>http://blog.ionicframework.com/ionic-and-typescript-part-1/</li>
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</ul>
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<p>鉴于Angular与Ionic都是使用了微软的TypeScript, 因此在学习ES6时，将学习TypeScript这一实现。</p>
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<h2 id="关于typescript"><a class="header" href="#关于typescript">关于TypeScript</a></h2>
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<p>TypeScript是Javascript的超集，有着以下优势：</p>
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<ul>
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<li>可选的静态类型（关键就是这里的“可选”, Optional static typing, the key here is optional）</li>
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<li>类型推理，此特性在并没有使用到类型的情况下，带来那些类型的诸多益处（Type Inference, which gives some of the benefits of types, without actually using them）</li>
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<li>可在主流浏览器尚未对ES6/ES7提供支持之前，通过TypeScript用上ES6及ES7的特性</li>
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<li>TypeScript有着将程序向下编译到所有浏览器都支持的某个Javascript版本的能力</li>
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<li>IntelliSense提供了极好的工具支持</li>
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</ul>
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<p>因为TypeScript带给如你一样的开发者这些不错的特性及巨大优势，Ionic是以TypeScript编写的，而不是ES6（这里就表明了<strong>TypeScript并不是ES6</strong>）。</p>
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<h3 id="关于可选的静态类型"><a class="header" href="#关于可选的静态类型">关于可选的静态类型</a></h3>
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<p>可能TypeScript最能打动人心的，就是其所提供到的可选静态类型系统了。将给变量、函数、属性等加上类型。这将帮到编译器，且在app尚未运行时，就给出有关代码中任何潜在错误的警告。在使用到库及框架时，类型也有帮助，这是由于类型可令到开发者准确知悉那些APIs期望何种类型的数据。而关于类型系统，你首先要记住的是它是可选的。TypeScript并不强制要求开发者在他们不想添加的上必须添加类型。但随着应用变得越来越大、越来越复杂，类型确实可以提供到一些很棒的优势。</p>
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<p>关于 IntelliSense:</p>
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<blockquote>
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<p>一种 Microsoft 技术，这种技术通过在光标悬停在函数上时显示类定义和注释，从而让您可以分析源代码。当您在 IDE 中键入函数名时，IntelliSense 还可以完成这些名称。</p>
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</blockquote>
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<p>TypeScript的一大优势，就是其代码补全与IntelliSense了。IntelliSense在敲入代码时，提供有用的提示。因为Ionic本身就是用TypeScript写就的，代码编辑器就可以展示出所有可用的方法，以及这些方法所期望的参数。当今所有最好的集成开发环境，比如VScode、Atom、Sublime text，甚至那些诸如Vim/Neovim等命令行的编辑器，都有对代码补全的支持。</p>
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<p>TypeScript的许多优势，带来了一种好得多的app开发体验。因此，Ionic将全力压注到TypeScript上，而不提供ES6的启动器。</p>
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<p>摘录自：</p>
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<blockquote>
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<p><a href="https://ionicframework.com/docs/developer-resources/typescript/">TypeScript的优势</a></p>
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</blockquote>
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<h2 id="本教程特色"><a class="header" href="#本教程特色">本教程特色</a></h2>
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<p>针对新特性的详细讨论，并与与实例代码结合。TypeScript是在Javascript的基础上，引入了诸多新特性，本教程将逐一讨论这些新特性，并同时编写相应代码加以验证。</p>
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<h2 id="环境的建立"><a class="header" href="#环境的建立">环境的建立</a></h2>
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<p>环境的建立主要由三个文件构成：</p>
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<ul>
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<li><code>package.json</code> -- NodeJS 的项目文件，该文件包含了项目的各种信息与包依赖，比如项目名称、所有者信息、许可证、git地址等信息，包含各种依赖包等。</li>
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</ul>
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<pre><code class="language-json">{
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"name": "typescript-learnings",
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"version": "0.1.0",
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"description": "TypeScript Learning stuffs.",
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"main": "/dist/main.js",
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"scripts": {
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"gulp": "gulp &",
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"start": "live-server dist/",
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/gnu4cn/ts-learnings.git"
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},
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"keywords": [
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"TypeScript"
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],
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"author": "Peng Hailin, unisko@gmail.com",
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"license": "ISC",
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"bugs": {
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"url": "https://github.com/gnu4cn/ts-learnings/issues"
|
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},
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"homepage": "https://github.com/gnu4cn/ts-learnings#readme",
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"devDependencies": {
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"@types/reflect-metadata": "^0.1.0",
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"gulp": "^4.0.0",
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"gulp-sourcemaps": "^2.6.1",
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"gulp-typescript": "^5.0.1",
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"gulp-uglify": "^3.0.0",
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"live-server": "^1.2.0",
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"typescript": "^3.4.1"
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},
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"dependencies": {}
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}
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</code></pre>
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<p><code>package.json</code>文件是所有NodeJS项目都有的文件，有了该文件，就可以使用<code>npm -i</code>命令，在本地安装项目依赖包。于是项目就可以运行起来了。</p>
|
||
<ul>
|
||
<li>
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||
<p><code>tsconfig.json</code> 文件</p>
|
||
<p>该文件表明此NodeJS项目是一个 TypeScript项目，其中包含了<code>files</code>、<code>include</code>、<code>exclude</code>、<code>compilerOptions</code>等属性，用于将 TypeScript代码编译为 JavaScript目标代码过程。</p>
|
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</li>
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</ul>
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<pre><code class="language-json">{
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"include": [
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"src/*.ts"
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],
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"compilerOptions": {
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"noImplicitAny": true,
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"target": "es5",
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"outDir": "dist/",
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"experimentalDecorators": true,
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"emitDecoratorMetadata": true,
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"types": [
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"reflect-metadata"
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]
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}
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}
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||
</code></pre>
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<ul>
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<li>
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<p><code>gulpfile.js</code> 文件</p>
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<p>该文件是 Gulp 自动化工具的配置文件。利用 Gulp 来自动化处理有关编译、打包及SourceMap相关工作。在上面的<code>package.json</code>文件中包含了对 <code>gulp</code>、<code>gulp-typescript</code>的依赖，其中<code>gulp-typescript</code>就是 Gulp中的 TypeScript编译器。</p>
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||
</li>
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||
</ul>
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<pre><code class="language-javascript">var gulp = require('gulp');
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var ts = require('gulp-typescript');
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var tsProject = ts.createProject('tsconfig.json');
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let paths = {
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pages: ["src/*.html"]
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};
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gulp.task("copy-html", ()=>{
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return gulp.src(paths.pages)
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.pipe(gulp.dest("dist"))
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});
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gulp.task('tsc', () => {
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return gulp.src('src/*.ts')
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.pipe(tsProject())
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.pipe(gulp.dest('dist'));
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});
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||
|
||
// 这里 watch 里必须使用 gulp.series
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gulp.task('watch', () => {
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gulp.watch('src/*.ts', gulp.series('tsc'));
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});
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// 这里必须要有一个 default 任务
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gulp.task('default', gulp.series('copy-html', 'tsc', 'watch'));
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</code></pre>
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<p>有了这三个文件，就意味着环境建立起来了，可以开始TypeScript代码的编写了。<code>src</code>目录下的所有<code>.ts</code>代码，都将被编译到 <code>dist</code>目录下。</p>
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