Counter: {count} Increment Decrement ); }; // 将 Counter 组件连接到 Redux store const ConnectedCounter = connect( state => ({ count: state.count }), { increment, decrement } )(Counter); // App 组件 const App = () => { return ( <Provider store={store}> <ConnectedCounter /> <...
render() { return ( You are running this application in {process.env.NODE_ENV} mode. ); } During the build, process.env.REACT_APP_SECRET_CODE will be replaced with the current value of the REACT_APP_SECRET_CODE environment variable. Remember that the NODE_ENV variable will be ...
复制 importReact,{useState}from'react';constCounter=()=>{const[count,setCount]=useState(0);constincrement=()=>{setCount(count+1);};constdecrement=()=>{setCount(count-1);};return(CounterCount:{count}IncrementDecrement);};exportdefaultCounter; 在上面的示例中,我们首先从react包中导入useState钩子...
} };// Storeletstore =createStore(counter);// ActionconstincrementAction = {type:'INCREMENT'}; store.dispatch(incrementAction);// ViewconstApp= () => (<Providerstore={store}>// Your application code goes here</Provider>); 了解Context API Context API 是 React 提供的一项功能,用于在组件之间...
应用状态 - Application state 应用程序状态是引导用户整体体验的状态,这可能是授权状态、配置文件数据或全局样式主题。在应用程序的任何地方都可能需要它。下面是一个简单的示例: importReact,{useContext,useState}from"react";constThemeContext=React.createContext();constTheme=({onChange})=>{const{theme}=useContex...
[Reduc] React Counter Example Before you use the React Redux bindings, learn how to create a complete simple application with just React and Redux. JS Bin const counter = (state = 0, action) =>{switch(action.type) {case'INCREMENT':returnstate + 1;case'DECREMENT':return...
render() { return ( You are running this application in {process.env.NODE_ENV} mode. ); }During the build, process.env.REACT_APP_SECRET_CODE will be replaced with the current value of the REACT_APP_SECRET_CODE environment variable. Remember that the NODE_ENV variable will be set...
在src 目录中新建 Counter.js ,其中内容如下:// 导入样式 import './Counter.css'; let value = 9527; function handler(evt){ console.log( 'handler: ' , evt ); } function Counter(){ return ( {value} ); } export default Counter ; 1.2.3、使用组件在App.js 中导入 Counter 组件并使用该...
import{useState}from'react';import{createRoot}from'react-dom/client';functionCounter(){const[count,setCount]=useState(0);return(<>{count}setCount(count+1)}>Increment</>);}constroot=createRoot(document.getElementById('root'));root.render(<Counter/>); Documentation Seehttps://react.dev/ API...
Get StartedSwitch to Preact functionCounter(){const[value,setValue]=useState(0);return(<>Counter:{value}setValue(value+1)}>IncrementsetValue(value-1)}>Decrement</>)} Proudlysponsored by: A different kind of library Closer to the DOM Preact provides...