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...
The official website of 1.flowable is https: www.flowable.org . With each click of the download button under the download menu, the website cannot be accessed. The flowable-engine-flowable-6.4.0.zip file is added to github , and the various war p...
I want to climb a website with about 1 billion data. Url is http: xxx.com id=xx accesses and extracts the data and stores it in the database . where the id parameter in url is predictable, ranging from 0 to 1000000000 so I can generate these 1 bill...
for example, can I scroll up after scrolling to the bottom? ...
submitted the sitemap in google search console, and crawled all the URLs in the google crawl tool. Later, the site deleted some pages, but three days later, the deleted pages can still be found in the google search results. Today, when I see the processi...
problem description the lowercase of the child component name is not recognized in the parent template in the vue project the environmental background of the problems and what methods you have tried as shown in the figure, the lowercase letter ...