action 中传递参数
App.js 中 传递自己的参数
function App (props){ console.log(props,'===') return ( <div> <h1>redux</h1> <button onClick={()=>{props.increment(10)}}>增加</button> <p>{props.count}</p> <button onClick={()=>{props.decrement(3)}}>减少</button> </div> ) }
action.js 传参
export const increment = (num) => ({ type:'increment',payload:num }) export const decrement = (num) => ({ type:'decrement',payload:num })
reduce.js 中打印 action
import { initstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export function reducer(state = initstate,action){ console.log(action,'===action') switch(action.type){ case 'increment' :return {count:state.count + action.payload} break; case 'decrement' :return {count:state.count - action.payload} break; default :return state } }
多个state状态
增加一个新的state。 控制div 的背景颜色
定义color 组建
function Color (props){ let style = { width:100, height:100, background:props.color, textAlign:'center', lineHeight:100, } console.log('colorprops',props) return( <div> <button onClick={()=>{props.fngreen()}}>green</button> <button onClick={()=>{props.fnred()}}>red</button> <div style={style}>多个 state</div> </div> ) } export default Color
定义state
// 3.定义state export const initstate = { count:0 } //color export const colorstate = { color:'red' }
定义action
export const increment = (num) => ({ type:'increment',payload:num }) export const decrement = (num) => ({ type:'decrement',payload:num }) //处理color export const fngreen = () => ({ type:'fngreen'}) export const fnred = () => ({ type:'fnred' })
定义reducer 处理color的reducer1
import { colorstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export function reducer(state = colorstate,action){ console.log(action,'===color') switch(action.type){ case 'fngreen' :return {color:'green' } break; case 'fnred' :return {color:'red'} break; default :return state } }
store/index 创建store
import {createStore} from 'redux' import{ reducer } from './reducer/reducer1' //1. 定义store let store = createStore( reducer ) export default store console.log(store)
color组建
import { connect } from 'react-redux'; import { bindActionCreators } from 'redux' import *as actionobj from '../store/action/action' function Color (props){ let style = { width:100, height:100, background:props.color, textAlign:'center', lineHeight:100, } console.log('colorprops',props) return( <div> <button onClick={()=>{props.fngreen()}}>green</button> <button onClick={()=>{props.fnred()}}>red</button> <div style={style}>多个 state</div> </div> ) } const mapStateToProps = function(state){ return {color:state.color} } const mapDispatchToProps = (dispatch) => { return bindActionCreators(actionobj,dispatch) } export default connect(mapStateToProps,mapDispatchToProps)(Color);
整合 reducer combineReducers(reducers)
redux/combineReducers.md at master · reduxjs/redux · GitHub
多个reducer进行整合 reducer下创建index.js
reducer/index.js
import { combineReducers } from 'redux' import reducer1 from './reducer1' import reducer2 from './reducer2' export default combineReducers({ reducer1, reducer2 })
reducer1.js
import { colorstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export default function reducer1(state = colorstate,action){ console.log(action,'===color') switch(action.type){ case 'fngreen' : return {color:'green' } break; case 'fnred' : return {color:'red'} break; default :return state } }
reducer2.js
import { initstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export default function reducer2(state = initstate,action){ console.log(action,'===action') switch(action.type){ case 'increment' :return {count:state.count + action.payload} break; case 'decrement' :return {count:state.count - action.payload} break; default :return state } }
store/index.js
import {createStore} from 'redux' import reducer from './reducer' //1. 定义store let store = createStore( reducer ) export default store
App.js
注意:combineReducers
返回的结果是一个对象
{ reducer1:{color:'red'}, reducer2:{count:0} }
所以在使用的。候需要。{props.reducer2.count} background:props.reducer1.color,
映射的时候需要解构
reducer1.js. 和reducer2.js 解构state
import { colorstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export default function reducer1(state = colorstate,action){ console.log(action,'===color') switch(action.type){ case 'fngreen' : return {...state,color:'green' } break; case 'fnred' : return {...state,color:'red'} break; default :return state } }
import { initstate } from "../state/state"; //2.定义 reducer 第一个参数 state 第二个参数 action export default function reducer2(state = initstate,action){ console.log(action,'===action') switch(action.type){ case 'increment' :return {...state,count:state.count + action.payload} break; case 'decrement' :return {...state,count:state.count - action.payload} break; default :return state } }
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