Tutorial 자습서 - 7
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Reactjs.org 자습서 Tutorial 활용 - 순서대로
https://ko.reactjs.org/tutorial/tutorial.html
- 틱택토 Tic Tac Toe 게임 만들기로 자습하기 -
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자습서 - 7
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6회차에서 ... 승자 결정까지 완료했다.
히스토리를 만들어 볼까?
요로케?
import React from 'react';
import ReactDOM from 'react-dom';
import './square.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); calculateWinner 함수 호출
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;
}
export default Square;
최종 결과 화면
9. Go to move #8 버튼을 클릭한 결과 화면 - 한번 뒤로 간 거죠~~
