React学习——快速上手

文章目录

初步
模块思维

初步

https://php.cn/faq/400956.html

1、可以手动使用npm来安装各种插件，来从头到尾自己搭建环境。
如：

npm install react react-dom --save
npm install babel babel-loader babel-core babel-preset-es2015 babel-preset-react --save
npm install babel webpack webpack-dev-server -g

2、脚手架
在这里插入图片描述

create-react-app

npm install -g create-react-app

create-react-app my-app
cd my-app/
npm start

模块思维

https://react.dev/learn/tutorial-tic-tac-toe

官方文档的井字游戏案例

import { useState } from 'react';function Square({ value, onSquareClick }) {return (<button className="square" onClick={onSquareClick}>{value}</button>);
}function Board({ xIsNext, squares, onPlay }) {function handleClick(i) {if (calculateWinner(squares) || squares[i]) {return;}const nextSquares = squares.slice();if (xIsNext) {nextSquares[i] = 'X';} else {nextSquares[i] = 'O';}onPlay(nextSquares);}const winner = calculateWinner(squares);let status;if (winner) {status = 'Winner: ' + winner;} else {status = 'Next player: ' + (xIsNext ? 'X' : 'O');}return (<><div className="status">{status}</div><div className="board-row"><Square value={squares[0]} onSquareClick={() => handleClick(0)} /><Square value={squares[1]} onSquareClick={() => handleClick(1)} /><Square value={squares[2]} onSquareClick={() => handleClick(2)} /></div><div className="board-row"><Square value={squares[3]} onSquareClick={() => handleClick(3)} /><Square value={squares[4]} onSquareClick={() => handleClick(4)} /><Square value={squares[5]} onSquareClick={() => handleClick(5)} /></div><div className="board-row"><Square value={squares[6]} onSquareClick={() => handleClick(6)} /><Square value={squares[7]} onSquareClick={() => handleClick(7)} /><Square value={squares[8]} onSquareClick={() => handleClick(8)} /></div></>);
}export default function Game() {const [history, setHistory] = useState([Array(9).fill(null)]);const [currentMove, setCurrentMove] = useState(0);const xIsNext = currentMove % 2 === 0;const currentSquares = history[currentMove];function handlePlay(nextSquares) {const nextHistory = [...history.slice(0, currentMove + 1), nextSquares];setHistory(nextHistory);setCurrentMove(nextHistory.length - 1);}function jumpTo(nextMove) {setCurrentMove(nextMove);}const moves = history.map((squares, move) => {let description;if (move > 0) {description = 'Go to move #' + move;} else {description = 'Go to game start';}return (<li key={move}><button onClick={() => jumpTo(move)}>{description}</button></li>);});return (<div className="game"><div className="game-board"><Board xIsNext={xIsNext} squares={currentSquares} onPlay={handlePlay} /></div><div className="game-info"><ol>{moves}</ol></div></div>);
}function calculateWinner(squares) {const lines = [[0, 1, 2],[3, 4, 5],[6, 7, 8],[0, 3, 6],[1, 4, 7],[2, 5, 8],[0, 4, 8],[2, 4, 6],];for (let i = 0; i < lines.length; i++) {const [a, b, c] = lines[i];if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {return squares[a];}}return null;
}