在下面的程序中,当我单击任何按钮时,另一个按钮也会重新呈现,即使我已经使用了React.memo()。此外,只有其他按钮得到重新呈现,而不是其他计数。为什么?我有这样一个父组件:
import React, { useState } from 'react'
import Count from './Count'
import Button from './Button'
import Title from './Title'
function ParentComponent() {
const [age, setAge
我有一个带有子图表组件的主组件。在连接到websocket时,主组件更新子图表组件的状态。但是,这不会重绘。但是,当我单击图表时,标签会出现,当我再次单击时,值会与标签一起出现。
Main.js:
import IO from 'socket.io-client';
import React from "react";
import { Switch, Route } from 'react-router-dom';
import { Chart } from "./Chart";
let ftse100Tickers = r
我有一张桌子的反应组件。如果用户不是我,那么当我看到该用户的配置文件页面时,我只看到表的前三列。如果用户是我,那么我会看到四列。但是,动态更改列会导致以下错误:
Uncaught Error: Invariant Violation: processUpdates(): Unable to find child 3 of element. This probably means the DOM was unexpectedly mutated (e.g., by the browser), usually due to forgetting a <tbody> when using
import React, { useEffect } from "react";
import useHttp from "./hooks/use-http";
export default function App() {
const getReq = async () => {
const response = await fetch(
"" // assume this to be a random link fetching data
);
const responseData = a