我尝试在useEffect中更新数据,但在控制台中显示警告。
React Hook useEffect has missing dependencies: 'dispatch', 'id', and 'state.selectedHotel'. Either include them or remove the dependency array react-hooks/exhaustive-deps
码
import { GlobalContext } from "../../../context/globalContext";
我正在试图弄清楚为什么我的useEffect钩子不断被多次调用,即使依赖项具有相同的值。我使用以下代码:
import React, { useEffect, useState } from 'react'
import PropTypes from 'prop-types'
import Cards from '../../../cards/Cards'
import UserCard from '../../../cards/users/Card'
import LoadingContainer from '../.
在我的React应用程序中,我遇到了一些奇怪的行为,其中setEffect的状态(比如state1)作为第二个参数,在没有调用setState1的情况下改变了另一个变量(而不是状态)。因此,我编写了以下代码,以查看是否会发生相同的情况,并做到了:
import React, { useState, useEffect } from 'react';
function App() {
let [state1, setState1] = useState('');
let count = 0;
useEffect(() => {
co
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import './App.css';
import ArrayState from './components/ArrayState';
import FetchApi from './components/FetchAPI/FetchApi';
import Login from './components/Login';
import Useeffect2 from './components/Useeffect2';
import UseEffects from './components/Us
我目前正在研究useEffect的react文档示例
import React, { useState, useEffect } from 'react';
function Example() {
const [count, setCount] = useState(0);
// Similar to componentDidMount and componentDidUpdate:
useEffect(() => {
// Update the document title using the browser API
document.
我在读反应钩子的概念。我通过了一条规则,上面写着Don't call React hooks inside conditions。在这里,他们提供了解释。
function Form() {
// 1. Use the name state variable
const [name, setName] = useState('Mary');
// 2. Use an effect for persisting the form
useEffect(function persistForm() {
localStorage.setItem(
我开始使用Hook,但在处理多个useEffect时遇到问题 当前钩子代码: //1st useEffect should run only on DidMount
React.useEffect(()=>{
//Calling API only on didMount
},[])
//2st useEffect should run on Context value Changes
React.useEffect(()=>{
//Processing Context Foo and Context Bar on didMount and didUpdate
},[fo