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這篇文章主要講解了“react-redux action傳參及多個state處理如何實現”,文中的講解內容簡單清晰,易于學習與理解,下面請大家跟著小編的思路慢慢深入,一起來研究和學習“react-redux action傳參及多個state處理如何實現”吧!
App.js 中 傳遞自己的參數
function App (props){ console.log(props,'===') return ( <div> <h2>redux</h2> <button onClick={()=>{props.increment(10)}}>增加</button> <p>{props.count}</p> <button onClick={()=>{props.decrement(3)}}>減少</button> </div> ) }
action.js 傳參
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.定義 reducer 第一個參數 state 第二個參數 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 } }
增加一個新的state。 控制div 的背景顏色
定義color 組建
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}>多個 state</div> </div> ) } export default Color
定義state
// 3.定義state export const initstate = { count:0 } //color export const colorstate = { color:'red' }
定義action
export const increment = (num) => ({ type:'increment',payload:num }) export const decrement = (num) => ({ type:'decrement',payload:num }) //處理color export const fngreen = () => ({ type:'fngreen'}) export const fnred = () => ({ type:'fnred' })
定義reducer 處理color的reducer1
import { colorstate } from "../state/state"; //2.定義 reducer 第一個參數 state 第二個參數 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 創建store
import {createStore} from 'redux' import{ reducer } from './reducer/reducer1' //1. 定義store let store = createStore( reducer ) export default store console.log(store)
color組建
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}>多個 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
多個reducer進行整合 reducer下創建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.定義 reducer 第一個參數 state 第二個參數 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.定義 reducer 第一個參數 state 第二個參數 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. 定義store let store = createStore( reducer ) export default store
App.js
注意:combineReducers
返回的結果是一個對象
{ reducer1:{color:'red'}, reducer2:{count:0} }
所以在使用的。候需要。{props.reducer2.count} background:props.reducer1.color,
映射的時候需要解構
reducer1.js. 和reducer2.js 解構state
import { colorstate } from "../state/state"; //2.定義 reducer 第一個參數 state 第二個參數 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.定義 reducer 第一個參數 state 第二個參數 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 } }
感謝各位的閱讀,以上就是“react-redux action傳參及多個state處理如何實現”的內容了,經過本文的學習后,相信大家對react-redux action傳參及多個state處理如何實現這一問題有了更深刻的體會,具體使用情況還需要大家實踐驗證。這里是億速云,小編將為大家推送更多相關知識點的文章,歡迎關注!
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