记录一篇关于redux-saga的基本使用过程

安装

npm install --save redux
npm install --save redux-saga

配置action

actionType

创建文件src/actions/types.js，在types.js文件中添加需要的action类型

export const TEST1_ACTION = 'test1';
export const SET_TEST2_ACTION = 'change_test2';
export const SET_TEST3_ACTION = 'change_test3';

createActions

创建文件src/actions/test.js，在test.js文件中编写action

import {TEST1_ACTION, SET_TEST2_ACTION, SET_TEST3_ACTION} from './types
// 获取test1的值
export const getTest1Action = () => {
return {
type:TEST1_ACTION
}
}
// 写入test2的值
export const setTest2Action = (testValue) => {
return {
type:SET_TEST2_ACTION,
payload:testValue
}
}
// 写入test3的值
export const setTest3Action = (payload) => {
return {
type:SET_TEST3_ACTION,
payload
}
}

配置reducer

因为一个项目中可能会有很多地方需要用到reducer，所以把这些reducer文件分开管理比较好，比如：test.js,settings.js,auth.js等等。

创建文件src/reducers/test.js，编写test reducer

import {TEST1_ACTION, SET_TEST2_ACTION, SET_TEST3_ACTION} from '../actions/types
// 初始化
const initTest = {
test1:'这是test1初始化的值',
test2:'这是test2初始化的值',
test3:'这是test3初始化的值'
}
export default (state = initTest, action) =>{
switch (action.type) {
case TEST1_ACTION:{
return {
...state
}
}
case SET_TEST2_ACTION:{
return {
...state,
test2:action.payload
}
}
case SET_TEST3_ACTION:{
return {
...state,
test3:action.payload.testValue
}
}
default:
return state
}
}

创建文件src/reducers/index.js

import {combineReducers} from 'redux'
import test from './test'
const reducers = combineReducers({
test,
/*
还可以继续加入其它的reducer文件，比如：
settings,
auth,
*/
});
export default reducers;

配置saga

创建文件src/sagas/test.js

import {all,fork,put,takeEvery} from 'redux-saga/effects'
import {setTest2Action, setTest3Action} from "../actions/test"
import {SET_TEST2_ACTION, SET_TEST3_ACTION} from "../actions/actionTypes"
import axios from 'axios'
function* changeTest2 (testValue) {
yield put(setTest2Action(testValue))
}
function* changeTest3 (obj) {
try{
// 这里使用axios从网络获取数据演示，没有安装axios的需要先安装它。
// 期间响应状态码判断就省略了，就当它每次请求都成功获得testValue的数据
response = axios.get('http://localhost/api/test')
// 假设response.data里面有一个key为testValue的值
yield put(setTest3Action(response.data))
} catch (error) {
console.error('这里也可以yield put一个createAction，这里不作演示')
}
}
export function* setTest2 () {
yield takeEvery(SET_TEST2_ACTION, changeTest2)
}
export function* setTest3 () {
yield takeEvery(SET_TEST3_ACTION, changeTest3)
}
export default function* testSaga(){
yield all([
fork(setTest2),
fork(setTest3),
])
}

创建文件src/sagas/index.js

import {all} from 'redux-saga/effects';
import testSaga from './test'
export default function* rootSaga() {
yield all([
testSaga()
]);
}

配置store

import {applyMiddleware, compose, createStore} from 'redux';
import reducers from '../reducers/index';
import createSagaMiddleware from 'redux-saga';
import rootSaga from '../sagas/index';
const sagaMiddleware = createSagaMiddleware();
// 使用数组是为了方便以后继续添加中间件
const middlewares = [sagaMiddleware];
const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const store = createStore(
reducers,
composeEnhancers(applyMiddleware(...middlewares))
);
sagaMiddleware.run(rootSaga);
export default store;

App入口文件路由配置

import React from 'react'
import {Provider} from 'react-redux'
import store from './store'
import Test from './Test/'
import {BrowserRouter, Route, Switch} from "react-router-dom"
const MainApp = () =>
<Provider store={store}>
<BrowserRouter>
<Switch>
<Route path="/" component={Test}/>
</Switch>
</BrowserRouter>
</Provider>;
export default MainApp

Test.js

src/Test/index.js

import React from 'react'
import {connect} from 'react-redux'
import {setTest2Action, setTest3Action} from '../actions/test'
class Test extends React.Component {
render() {
const {test1, test2, test3, setTest2Action, setTest3Action} = this.props
return {
<div>
<div>
test1的值为：{test1}
</div>
<div>
test2的值为：{test2}
<button onClick={setTest2Action('abc')}>设置test2的值为 abc</button>
</div>
<div>
test3的值为：{test3}
<button onClick={setTest3Action()}>从网络获取test3的值</button>
</div>
</div>
}
}
}
const mapStateToProps = ({test}) => {
const {test1,test2,test3} = test;
return {test1,test2,test3}
}
export default connect (mapStateToProps,{setTest2Action, setTest3Action})(Test)

至此，即可运行

npm start

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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