December 2017
Intermediate to advanced
329 pages
6h 9m
Chinese
Content preview from React学习手册
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组件扩展
｜
173
render
方法的高阶函数每秒都会触发一次
ReactDOM.render
方法，同时更新
DOM
。该
方法吸收了
React
快速渲染
DOM
的优势，但是不需要用到一个带
State
的组件类。
该应用程序的
State
是在
React
之外管理的。
React
允许我们通过提供自己的高阶函数使
用
ReactDOM.render
方法渲染一个组件，继而达到保留原有的函数式架构的目的。在
React
之外管理
State
并不是必须的，只是让用户多了一个选择。
React
是一个脚本库，
由用户决定如何以最佳的方式在自己的应用程序中使用它。
接下来，我们将介绍
Flux
，它是一种设计模式，被视为在
React
中管理
State
的一种替
代性方案。
Flux
Flux
是
Facebook
开发的一种设计模式，旨在保持数据单向流动。在
Flux
诞生之前，
Web
开发架构由多种
MVC
设计模式的变体所主导。
Flux
是
MVC
的替代品，是一种完
全不同的设计模式，并且与函数式编程范式相辅相成。
React
或者
Flux
和函数式
JavaScript
又有什么关系呢？对于初学者来说，一个无状态函
数式组件就是一个纯函数。它通过属性获取操作指令并返回
UI
元素。一个
React
类使
用
State
或者
props
作为输入，同时也会构造
UI
元素。若干
React
组件可以进一步合成单
个组件。不可变数据提供组件作为输入，然后返回的
UI
元素作为输出：
const Countdown = ({count}) => <h1>{count}</h1>
Flux
为我们提供一种
Web
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.