December 2017
Intermediate to advanced
329 pages
6h 9m
Chinese
Content preview from React学习手册
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83
第
5
章
React
与
JSX
在上一章中，我们已经知道虚拟
DOM
是
React
创建和更新用户界面时遵循的一组指
令。这些指令是由
JavaScript
对象构成的，同时也被称为
React
元素。到目前为止，我
们已经学习了两种方法创建
React
元素：使用
React.createElement
方法和使用工厂
类。
为了避免冗长的输入，
React.createElement
方法又被简称为
JSX
，一种
JavaScript
的
扩展，允许用户使用类似
HTML
的语法定义
React
元素。在本章中，我们将会讨论如何
使用
JSX
构造一个包含
React
元素的虚拟
DOM
。
React
元素和
JSX
Facebook
的
React
团队在发布
React
的同时也发布了
JSX
，它提供了一种简洁的语法，
方便用户使用属性创建复杂的
DOM
树。他们还希望
React
项目可以像
HTML
和
XML
一
样易于理解。
在
JSX
中，一个元素的类型是由一个标签声明的。该标签的属性就表示元素的属性。
元素的子节点可以被添加到开闭标签之间。
用户还可以添加其他
JSX
元素作为子节点。假定有一个无序列表，用户可以使用
JSX
标签为该列表添加子列表元素
(
参见示例
5-1)
。
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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.