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- import React from 'react';
- import ReactDOM from 'react-dom';
- import './index.css';
- import { tsConstructorType, arrayExpression } from '@babel/types';
- function Square(props) {
- return (
- <button className="square" onClick={props.onClick}>
- {props.value}
- </button>
- );
- }
- class Board extends React.Component {
- renderSquare(i) {
- return (
- <Square
- value={this.props.squares[i]}
- onClick={() => this.props.onClick(i)}
- />
- );
- }
- render() {
- return (
- <div>
- <div className="board-row">
- {this.renderSquare(0)}
- {this.renderSquare(1)}
- {this.renderSquare(2)}
- </div>
- <div className="board-row">
- {this.renderSquare(3)}
- {this.renderSquare(4)}
- {this.renderSquare(5)}
- </div>
- <div className="board-row">
- {this.renderSquare(6)}
- {this.renderSquare(7)}
- {this.renderSquare(8)}
- </div>
- </div>
- );
- }
- }
- class Game extends React.Component {
- constructor(props) {
- super(props);
- this.state = {
- history: [
- {
- squares: Array(9).fill(null)
- }
- ],
- stepNumber: 0,
- xIsNext: true
- };
- }
- handleClick(i) {
- const history = this.state.history.slice(0, this.state.stepNumber + 1);
- const current = history[history.length - 1];
- const squares = current.squares.slice();
- if (calculateWinner(squares) || squares[i]) {
- return;
- }
- squares[i] = this.state.xIsNext ? "X" : "O";
- this.setState({
- history: history.concat([
- {
- squares: squares
- }
- ]),
- stepNumber: history.length,
- xIsNext: !this.state.xIsNext
- });
- }
- jumpTo(step) {
- this.setState({
- stepNumber: step,
- xIsNext: (step % 2) === 0
- });
- }
- render() {
- const history = this.state.history;
- const current = history[this.state.stepNumber];
- const winner = calculateWinner(current.squares.);
- const moves = history.map((step, move) => {
- const desc = move ?
- 'Go to move #' + move :
- 'Go to game start';
- return (
- <li key={move}>
- <button onClick={() => this.jumpTo(move)}>{desc}</button>
- </li>
- );
- });
- let status;
- if (winner) {
- status = "Winner: " + winner;
- } else {
- status = "Next player: " + (this.state.xIsNext ? "X" : "O");
- }
- return (
- <div className="game">
- <div className="game-board">
- <Board
- squares={current.squares}
- onClick={i => this.handleClick(i)}
- />
- </div>
- <div className="game-info">
- <div>{status}</div>
- <ol>{moves}</ol>
- </div>
- </div>
- );
- }
- }
- // ========================================
- ReactDOM.render(<Game />, document.getElementById("root"));
- 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;
- }
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