import React, { Component }from'react';//路由依赖import { HashRouter, Route, Switch }from'react-router-dom';//异步组件import AsyncComponentfrom'./asyncComponent.jsx';//组件页面constHome = AsyncComponent(() => import(/*webpackChunkName: "Home"*/'./Home/index.jsx'));constCity = AsyncCo...
importAppfrom'./App';importLoadablefrom'react-loadable';import{BrowserRouterasRouter,Route,Link,Switch}from'react-router-dom';//通用的过场组件constMyLoadingComponent=({isLoading,error})=>{// Handle the loading stateif(isLoading){returnLoading...;}// Handle the error stateelseif(error){returnS...
React Async Component RAC is a library used for rendering components with asynchronous data. Getting started Installation Usingnpm npm i react-async-comp Usingyarn yarn add react-async-comp Quick Start Guide import{Suspense}from"react";import{ErrorBoundary}from"react-error-boundary";import{view}from...
React asyncComponent 用于按需加载组件,功能类似于 react-loadable 封装出这样一个函数的目的实际上是为了提升性能 代码层面实际上就是让 componentDidMount这个钩子异步执行,没挂载组件的时候,component一直是null,不影响页面,挂载后,触发钩子,给state.component赋值,之后render importReact,{Component}from"react";exportde...
React import()按需异步加载asyncComponent import()方法返回的是一个Promise。 asyncComponent是一个返回组件的函数 const asyncComponent = (importComponent) => { return class extends Component { constructor(){ super(); this.state = { component: null...
import React, { Component } from 'react'; class Button extends Component { render() { // ... } } export default Button; // Don’t forget to use export default! DangerButton.js import React, { Component } from 'react'; import Button from './Button'; // Import a component from an...
$ npm安装babel-plugin-dynamic-import-webpack eslint-plugin-import eslint-import-resolver-webpack -...
在React.js中,ComponentDidMount是一个生命周期方法,它在组件挂载完成后立即调用。通常情况下,我们可以在ComponentDidMount中执行异步操作,例如发送网络请求或获取数据。 然而,由于async/await是基于Promise的,而ComponentDidMount方法并不支持直接返回Promise对象,因此在ComponentDidMount中直接使用async/await是不可行的...
The easiest way to create an async component for data fetching is through the useFetch hook: Copy import React from "react" import { useFetch } from "react-async" const Person = ({ id }) => { const { data, error } = useFetch(`https://swapi.co/api/people/${id}/`, { headers:...
async componentDidMount() { //函数体中可以使用await } async/await可以简化异步操作的代码,用同步的形式表示异步的过程,这个语法,没有赶上ES6标准,也没有赶上ES7标准,但是,因为Babel的存在,实际上使用起来没有任何障碍。 因为Babel的支持,把React的生命周期函数时限为async函数其实也没有什么神奇之处,因为React要...