The function applyMiddleware (.middlewares) in applyMiddleware.js is used to generate the middleware chain that action passes through according to the middleware. Let s first take a look at the implementation of an incorrect version: export default fu...
how does it mean that return {} is an object, and then a comma separates two? Don t understand the meaning of the book ...
as the title if only component A will request apiA to get data, and the data will only be used by that component, then whether the data should be put into redux? unrelated questions: if the request does not depend on the view content, should the req...
what kind of data is suitable for store? Both vux and redux, see that many people put all the data in store for global management, such as a list. In fact, the data in this list is not communicated with other components, but is only used in this list. An...
As a matter of fact, there are several questions, which have been stuck for a long time. I don t know why 1. If the state of both reducer has a value, store.subscribe (() = > { console.log("================store:"+JSON.stringify(store)); });...
component 1 import React from react ; import {Table} from antd ; import {connect} from react-redux ; class Trade extends React.Component { componentWillMount() { const data = [ { key: 1 , name: John Brown , ...
Family bucket "react": "^16.2.0", "react-dev-utils": "^5.0.0", "react-dom": "^16.2.0", "react-redux": "^5.0.7", "react-router-dom": "^4.2...
recently, I am learning the framework of react. I have only used a single-page application before, but now I want to use it to build a multi-page forum application. If I encounter some questions, I will ask my predecessors to answer them. I now get th...
redux-thunk const fetchData = (params) => (dispatch) => { setTimeout(() => { dispatch({action: GET_DATA , payload: 111}) }) } dispatch const fetchData = (params) => ({action: GET_DATA , payload: 111}); setTimeout(() =>...
as mentioned, I have a project with multiple components, all of which have some event handling and operations. And different action events within these components may result in the same result, including updates to the redux. for example, I have two m...
I want to write that the value of state is retrieved from the background when reducer, is initialized. How should it be implemented? whether to use redux-thunk directly dispatch a function operation interface or state? that dispat already exists when u...
currently only know the traditional usage const App = connect( mapStateToProps, mapDispatchToProps )(Counter); but many projects use @connect(state => ({ value: state.global.value, extinfo: state.extinfo, })) I can understand what i...
1. The question is as follows: after getting store in any js utility class, the page cannot be updated automatically after the status of store.dispatch (actions), is changed? Can the page be automatically updated only when the state of the dispatch that...
realize the function of adding and subtracting numbers by clicking buttons through redux. it doesn t work according to other demo. I don t know what the problem is. Please explain paste the code below. ...
for example, there are many backend APIs for querying Car,People,Building and other resources. I need each resource to define the Reducer,action creator corresponding to the action type, of GET__XXX , GET_XXX_SUCCESS , GET_XXX_FAIL . Is there any libr...
after WebSocket was disconnected, I re-new a link. In the new connection, I can continue to receive and send data, but I found that ws.onmessage did not return the data after reconnection. I think he is still waiting for the data of the address before ...
Warning: Encountered two children with the same key, `.$4`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and or omitted the behavior is unsupported and could change i...
update the store data twice in a row, and the second time you will get the original store such as . initState ={ a: , b: }; dispatch(setState(a,1)) dispatch(setState(b,1)) the final state result is { a: , b:1 } if you repla...
The loading effect is handled uniformly in dva, but loading cannot be cancelled when an error occurs in the request. What should I do? ...
1.rootSaga.js import { fork, all } from "redux-saga effects"; import sub-sagas from submodules import { assemblyLineSaga } from "@ routes Devops AssemblyLine saga"; import { DashboardSaga } from "@ routes Devops Dashboard sa...
<?php namespace first; function f1(){ echo f1-1 ; } namespace second; function f1(){ echo f1-2 ; } f1(); Why did you output F1-2? are they all in the same space? The principle of proximity? ...
there is a 50% chance of returning an empty object, a probability and a result, so it won t work. < script type= "text javascript " src= " http: api.map.baidu.com api?.;ak=QkxUkfoyrAVOF2mNqUOw9krqbXNx6IRL ">< script><script type= "text j...
for example, We all know that there are five data types of value: String list hash set sorted set so what are the data types of key in Redis? ...
I defined mutations, in store.js and mutations, in store Module, isn t it? store.js import Vue from vue import Vuex from vuex import moduleDashboard from . modules dashboard import axios from axios Vue.use (Vuex) export defaul...
Mini Program s self-generated session_id cannot be inserted into the database, but if the request is returned, you can solve the get content . ...