importReact,{useState,useEffect}from'react';importaxiosfrom'axios';functionApp(){const[data,setData]=useState({hits:[]});useEffect(()=>{constfetchData=async()=>{constresult=awaitaxios('https://hn.algolia.com/api/v1/search?query=redux',);setData(result.data);};fetchData();},[]);return...
EN在使用react api钩子时，我遇到的大多数在初始化组件的useEffect钩子中调用useEffect数据的示例都是直接...
const fetchData = useCallback(() => { const url = "https://hn.algolia.com/api/v1/search?query=" + query; // ... Fetch data and return it ... }, [query]); // ✅ Callback deps are OK return <Child fetchData={fetchData} />; } function Child({ fetchData }) { let [d...
function Parent() { const data = useSomeAPI(); // ... // ✅ Good: Passing data down to the child return <Child data={data} />; } function Child({ data }) { // ... } 十一、订阅外部存储 有时,你的组件可能需要订阅 React 状态之外的一些数据。这些数据可能来自第三方库或内置浏览器...
importReact,{useState,useEffect}from'react';importaxiosfrom'axios';functionApp(){const[data,setData]=useState({hits:[]});useEffect(()=>{constfetchData=async()=>{constresult=awaitaxios('https://hn.algolia.com/api/v1/search?query=redux',);setData(result.data);};fetchData();},[]);return...
Let's give it a try: Modify the App.js in a way that includes a standard fetch all to the API, including the json method to get the data to console. 让我们尝试一下:修改App.js,使其包含一个标准的抓取API,包括将数据获取到控制台的json方法。importHeaderfrom"./components/Header"; function...
import React,{useState,useEffect}from'react';import axios from'axios';functionApp(){const[data,setData]=useState({hits:[]});useEffect(()=>{const fetchData=async()=>{const result=awaitaxios('https://hn.algolia.com/api/v1/search?query=redux',);setData(result.data);};fetchData();},[]...
useEffect(()=>{// 标志位防止内存泄漏let isActive=true;const loadData=async()=>{ try { const res=awaitfetch('/api');constdata=await res.json();if(isActive){ setData(data);} } catch(err){ console.error('加载失败:',err);}
function getFetchUrl(query) { return 'https://hn.algolia.com/api/v1/search?query=' + query; } useEffect(() => { const url = getFetchUrl('react'); // ... Fetch data and do something ... }, []); // 🔴 Missing dep: getFetchUrl ...
数据获取:实现一个函数组件,从 API 获取数据并在组件挂载时显示数据。 import React, { useEffect, useState } from 'react'; function FetchData() { const [data, setData] = useState(null); useEffect(() => { fetch('https://api.example.com/data') .then(response => response.json()) .then(...