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April 29, 2020 07:09
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react-tic-tac-toe
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<div id="root" /> |
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// import React from 'react'; | |
// import ReactDOM from 'react-dom'; | |
// import './index.css'; | |
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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<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script> |
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body { | |
font: 14px "Century Gothic", Futura, sans-serif; | |
margin: 20px; | |
} | |
ol, ul { | |
padding-left: 30px; | |
} | |
.board-row:after { | |
clear: both; | |
content: ""; | |
display: table; | |
} | |
.status { | |
margin-bottom: 10px; | |
} | |
.square { | |
background: #fff; | |
border: 1px solid #999; | |
float: left; | |
font-size: 24px; | |
font-weight: bold; | |
line-height: 34px; | |
height: 34px; | |
margin-right: -1px; | |
margin-top: -1px; | |
padding: 0; | |
text-align: center; | |
width: 34px; | |
} | |
.square:focus { | |
outline: none; | |
} | |
.kbd-navigation .square:focus { | |
background: #ddd; | |
} | |
.game { | |
display: flex; | |
flex-direction: row; | |
} | |
.game-info { | |
margin-left: 20px; | |
} |
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