December 2017
Intermediate to advanced
329 pages
6h 9m
Chinese
Content preview from React学习手册
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86
｜
第
5
章
JSX
看起来简洁易读，不过它无法被浏览器解析。所有
JSX
必须转换成
createElement
调用或者工厂类。幸运的是，有一款堪称完美的工具可以完成这个任务：
Babel
。
Babel
大部分软件编程语言都允许用户编译源码。
JavaScript
是一门解释性的语言：浏览器
会将
JavaScript
代码解析为文本，因此不需要对
JavaScript
代码进行编译。不过，并非
所有浏览器都支持最新的
ES6
和
ES7
规范，而且没有浏览器支持
JSX
格式的语法。
因为我们希望使用采用了
JavaScript
新特性的
JSX
，所以需要一种机制将我们偏爱的源
码转换成浏览器可以解析的格式。这个过程被称为转译，它也是
Babel(
https://babeljs.
io/
)
的主要功能。
它的第一版程序名叫
6to5
，发布于
2014
年
9
月。
6to5
是一款可以将
ES6
语法转换成
ES5
规范的工具，几乎支持所有主流的浏览器。随着该项目的发展，其旨在成为支持所有
ECMAScript
最新特性的平台。同时它还支持将
JSX
转译成纯粹的
React
源码。该项目
于
2015
年
2
月正式更名为
Babel
。
Facebook
、
Netflix
、
PayPal
和
Airbnb
等知名科技公司在生产环境中都采用了
Babel
。此
前
Facebook
曾经研发了一个
JSX
转译器作为他们的规范，不过不久之后他们就投入了
Babel
的怀抱。
Babel
的用法有多种。最简单的应用方式是直接在
HTML
文件中引用一个
babel-core
转
译器的链接，这将会转译任意类型为“
text ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.