React dva method to change state: 1. Create DvaState.js and dvaState.js files; 2. Enter the code as "import React from 'react'; import { connect } from ...}" .
The operating environment of this article: Windows7 system, react17.0.1, Dell G3.
react dva How to change the state?
react The dva framework clicks to modify the state value, which is similar to this.state and this.setState() in react
First show
The value of state before clicking to change
The change of state value after clicking to change
First create two files
DvaState.js in the routes directory
import?React?from?'react';import?{?connect?}?from?'dva';import?{?Link?}?from?'dva/router';let?count??=?0const?DvaState?=?({
??????dispatch,??????dvaState,??????})?=>?{??const?{dataList}?=?dvaState
??console.log(dataList)
??console.log(dvaState)??const?handleChangeState?=?()?=>?{
????dispatch({??????type:'dvaState/changeState',??????payload:{????????dataList:[
??????????{????????????list1:?count++,????????????list2:?'list22',????????????list3:?'list33'??????????},??????????{????????????list2:'111'??????????}
????????]
??????}
????})
??}??return?(????<p>??????<h2>dvaState</h2>??????<h2>{dataList[0].list1}</h2>??????<button onClick={handleChangeState}>改變state</button>????</p>??);};export?default?connect(({?dvaState?})?=>?({
??dvaState
}))(DvaState);
models directory Recommended study of dvaState.js
export?default?{??namespace:?'dvaState',??state:?{????dataList:[
??????{????????list1:'a',????????list2:'c',??????}
????]
},??subscriptions:?{????setup({?dispatch,?history?})?{
????},??},??effects:?{
??},??reducers:?{????changeState(state,?{payload})?{??????return?{...state,?...payload}
????}
??},};
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