前言:redux和mobx都是状态管理器,避免父级到子级再到子子级嵌套单向数据流,可以逻辑清晰的管理更新共享数据。(刷新页面redux储蓄数据即消失)
配置使用装饰器(使用高阶函数包装你的组件):
npm install babel-plugin-transform-decorators-legacy --save-dev
.babelrc配置:
{ "presets": [ "react-app" ], "plugins": [ [ "import", { "libraryName": "antd", "style": true } ], "transform-decorators-legacy" ] }
当使用react native的时候,下面这个预设可以代替 transform-decorators-legacy
"babel": { "presets": [ "react-app", "react-native-stage-0/decorator-support" ] },
一.redux
redux.js文件:
// 定义变量 const CODE_CHANGE = 'CODE_CHANGE' const NUMBER_LIST = 'NUMBER_LIST' const ERROR_MSG = 'ERROR_MSG' // 初始化数据 const initState = { industryNumber: storage.get('industryNumber'), numberList: [], msg: '' } // reducer export function isNumber(state = initState, action) { switch (action.type) { case CODE_CHANGE: return { ...state, industryNumber: action.industryNumber } case NUMBER_LIST: return { ...state, numberList: action.numberList } case ERROR_MSG: return { ...state, msg: action.msg } default: return state } }
reducer.js文件:
import { combineReducers } from 'redux' import { isNumber } from '/redux' export default combineReducers({ isNumber }) // 合并所有的reducer,并且返回
index.js入口文件:
import React from 'react' import ReactDOM from 'react-dom' import MainRouter from './Router' // 引入redux import { createStore, applyMiddleware, compose } from 'redux' importthunk from 'redux-thunk' // 中间插件,增强dispatch功能,可异步加载action可接受函数参数 import { Provider } from 'react-redux' //redux组件,全部子级可以直接更新redux的state import reducers from './reducer' // 这里判断浏览器环境是否开启Redux DevTools的插件(chrome浏览器扩展插件应用商店下载) const reduxDevtools = window.devToolsExtension ? window.devToolsExtension() : h => h //没有插件则返回空函数 const store = createStore(reducers, compose( applyMiddleware(thunk), reduxDevtools )) // 创建store ReactDOM.render( <Provider store={store}> <MainRouter/> //路由 </Provider>, document.getElementById('root') )
某子组件:
import { connect } from 'react-redux' // 装饰器 const fetchNumberList = () => { return dispatch => { // 异步请求需要 dispatch => {}包裹 fetch('异步请求').then(res => { if (res.code === 0) { dispatch({ type: 'NUMBER_LIST', numberList: res.data }) } }) } } @connect( state => state.isNumber, // 如果有多个reducer: state => ({ ..state.isNumber, ...state.someName }) { fetchNumberList } // 一些之前写好的action方法 ) class IndustryManagement extends Component { constructor(props) { super(props) this.state= { industryNumber: this.props.industryNumber && this.props.industryNumber[0], // 直接props引用redux的state } } btnChange() { this.props.fetchNumberList() //经过装饰器的函数都可用props引用 } render() { return ( <button onClick={ this.btnChange.bind(this) }> ) } }
二. mobx
这里推荐使用mobx-state-tree的写法,有兴趣的可去github上看用法,以下是传统写法:
store.js文件:
import { observable, action, runInAction } from 'mobx' // runInAction接受异步action class RootStore { @observable userInfo = null //注册变量并监视变化(可以是引用类型值或者普通值)
@observable number1 = 1
@observable number2 = 2
@computed getTotal(){
return this.number1 + this.number2 // 每当监视数据发生变化就会执行@computed
} @action.bound getData= async() => { // bound是为了绑定this上下文(箭头函数可不需要) let res = await get('接口地址') if (res.success) { runInAction(() => { // runInAction函数可异步修改@observable数据 this.userInfo = res.data }) } } } export default rootStore = new RootStore()
index.js入口文件:
import { Provider } from 'mobx-react' // 与上文的redux的Provider相似 import rootStore from './store' ReactDOM.render(<Provider rootStore={rootStore}> <MainRouter /> </Provider>, document.getElementById('root'))
某子组件:
import { observer, inject } from 'mobx-react' @inject(({store, otherStore}) => ({ // 选择注入store(如果有多个store),如果不用inject函数可直接import store from '../store',组件中直接store.userInfo使用
userInfo: store.userInfo,
total: store.getTotal
})) @observer class EmpRec extends Component { constructor(props) { super(props) } render() { return( <div>this.props.userInfo</div>
<div>this.props.total</div> // 3
)
}
}
对比下来感觉mobx比redux好用(逃~)