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resolve #22
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| 这就是 Babel 来拯救的东西。 | ||
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| [Babel](https://babeljs.io) is a [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler). It rewrites modern JavaScript code into the previous standard. | ||
| [Babel](https://babeljs.io) 是一个 [transpiler](https://en.wikipedia.org/wiki/Source-to-source_compiler)。它将新一代的 JavaScript 代码写入前一个标准中。 |
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[它将新一代的 JavaScript 代码写入前一个标准中] => [它将现代的 JavaScript 代码转化为上一代的标准形式]
| transpiler 会重写代码，因此现有的语法特性都被覆盖了。但是对于新特性我们需要写一个特殊的脚本来实现它们。JavaScript 是一个高度动态化的语言。脚本可能不仅是添加一些新特性，还会修改一些内置特性，以便它们根据现代标准表现。 | ||
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| There's a term "polyfill" for scripts that "fill in" the gap and add missing implementations. | ||
| 脚本有一个术语 “polyfill” 表示用来“填补”缺口并添加缺少的实现。 |
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[以便它们根据现代标准表现。] => [以便于它们表现得符合现代标准]
| If we orient towards modern engines and do not use features except those supported everywhere, then we don't need to use Babel. | ||
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| ## Examples in the tutorial | ||
| 如果我们朝着现代引擎进发，并且不使用那些除了任何地方都支持的特性之外的特性，那么我们就不需要使用 Babel。 |
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[如果我们朝着现代引擎进发] => [如果我们的目标是现代引擎]
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[并且不使用那些除了任何地方都支持的特性之外的特性] => [并且整个项目不使用其他地方不支持的特性]
leviding
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Apr 24, 2018
| Examples that use modern JS will work only if your browser supports it. | ||
| ```` | ||
| 只有你的浏览器支持它才会工作的现代 JS 例子： | ||
| ``` |
| 1. 第一，transpiler 程序，就是重写代码的那个。开发者在他自己的电脑上运行它。它将代码重写到旧的标准中。然后将代码交付给用户的网站。诸如 [webpack](http://webpack.github.io/) 或 [brunch](http://brunch.io/) 这样的现代项目构建系统提供了每当代码改变都会自动运行 transpiler 的方法，因此我们这边没有任何的时间损失。 | ||
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| 2. Second, the polyfill. | ||
| 2. 第二，polyfill. |
| # Polyfills | ||
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| The JavaScript language steadily evolves. New proposals to the language appear regularly, they are analyzed and, if considered worthy, are appended to the list at <https://tc39.github.io/ecma262/> and then progress to the [specification](http://www.ecma-international.org/publications/standards/Ecma-262.htm). | ||
| JavaScript 语言在稳步发展。对语言的新提议也会定期出现，它们会被分析讨论，如果认为有价值，就会被加入到 <https://tc39.github.io/ecma262/> 的列表中，然后进入 [规范](http://www.ecma-international.org/publications/standards/Ecma-262.htm)。 |
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@leviding Done. |
leviding
approved these changes
Apr 24, 2018
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resolve #22