December 2017
Intermediate to advanced
329 pages
6h 9m
Chinese
Content preview from React学习手册
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190
｜
第
8
章
色的查找定位。
ADD_COLOR
在
colors
的
Reducer
中将会用于返回一个包含额外颜色对象
的数组。把它们放在一起是为了方便协作。每个
Reducer
会聚焦于分支在
State
树中特
定
Action
的具体含义。
Reducer
合成不是必需的，只是一种推荐做法
Redux
并不需要用户创建短小精干的若干
Reducer
，然后将它们合成单个
Reducer
。我们可以创建一个
Reducer
函数来处理应用程序中的每个
Action
。为
此，我们将会失去模块化和函数式编程带来的好处。
Color Reducer
Reducer
的代码实现方式有很多种。
switch
语句是一种比较常见的选择，因为
Reducer
必须可以处理的多种
Action
。
color
的
Reducer
会在
switch
语句中测试
action.type
，然
后根据情况处理每种
Action
：
export const color = (state = {}, action) => {
switch (action.type) {
case C.ADD_COLOR:
return {
id: action.id,
title: action.title,
color: action.color,
timestamp: action.timestamp,
rating: 0
}
case C.RATE_COLOR: ...
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