163 lines
3.6 KiB
JavaScript
163 lines
3.6 KiB
JavaScript
/**
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* Web唐明明
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* 匆匆数载恍如梦，岁月迢迢华发增。
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* 碌碌无为枉半生，一朝惊醒万事空。
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* ComponentName: '官方demo - 组件之间的传参'
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*/
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import React from 'react';
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import ReactDOM from 'react-dom';
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import './index.css';
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// 类组件
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// class Square extends React.Component {
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// // 入口函数
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// render() {
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// return (
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// <button
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// className="square"
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// onClick={() => this.props.onSquare()}
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// >
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// {this.props.value}
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// </button>
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// );
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// }
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// }
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// 函数组件
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const Square = (props) => {
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return (
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<button
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className="square"
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onClick={props.onSquare}
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>
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{props.value}
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</button>
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)
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}
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class Board extends React.Component {
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// 小方格方法
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renderSquare(i) {
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return <Square
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value={this.props.squares[i]}
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onSquare={()=>this.props.onBoard(i)}
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/>;
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}
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render() {
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return (
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<div>
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<div className="board-row">
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{this.renderSquare(0)}
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{this.renderSquare(1)}
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{this.renderSquare(2)}
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</div>
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<div className="board-row">
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{this.renderSquare(3)}
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{this.renderSquare(4)}
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{this.renderSquare(5)}
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</div>
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<div className="board-row">
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{this.renderSquare(6)}
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{this.renderSquare(7)}
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{this.renderSquare(8)}
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</div>
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</div>
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);
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}
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}
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class Game extends React.Component {
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constructor (props) {
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super(props)
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this.state = {
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history: [{
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squares: Array(9).fill(null)
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}],
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xIsNext: true,
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stepIndex: 0
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}
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}
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// 定一个一个组件方法
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handleClick(i) {
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const history = this.state.history.slice(0, this.state.stepIndex + 1)
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const current = history[history.length - 1]
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const squares = current.squares.slice()
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if(calculateWinner(squares) || squares[i]){
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return
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}
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squares[i] = this.state.xInNext ? 'X': 'O'
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this.setState({
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history: history.concat([{ squares }]),
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xInNext: !this.state.xInNext,
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stepIndex: history.length
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})
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// Array.slice()返回数组选定的元素,相当于克隆了原有数组
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}
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jumpTo(index){
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this.setState({
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stepIndex: index,
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xIsNext: (index % 2) === 0,
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})
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}
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render() {
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const history = this.state.history
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const current = history[this.state.stepIndex]
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const winner = calculateWinner(current.squares)
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const moves = history.map((stepArr, index) => {
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const desc = index ? '下一步' + index : '开始游戏'
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return(
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<li key={index}>
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<button onClick={()=> this.jumpTo(index)}>{desc}</button>
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</li>
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)
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})
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let status;
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if(winner){
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status = '恭喜选手' + winner + '获胜~'
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}else{
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status = '下一位选手: ' + (this.state.xInNext ? 'X': 'O');
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}
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return (
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<div className="game">
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<div className="game-board">
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<Board
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squares={current.squares}
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onBoard={(i) => this.handleClick(i)}
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/>
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</div>
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<div className="game-info">
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<div>{status}</div>
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<ol>{moves}</ol>
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</div>
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</div>
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);
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}
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}
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function calculateWinner(squares) {
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const lines = [
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[0, 1, 2],
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[3, 4, 5],
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[6, 7, 8],
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[0, 3, 6],
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[1, 4, 7],
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[2, 5, 8],
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[0, 4, 8],
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[2, 4, 6],
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];
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for (let i = 0; i < lines.length; i++) {
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const [a, b, c] = lines[i];
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if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
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return squares[a];
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}
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}
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return null;
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}
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ReactDOM.render(
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<Game />,
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document.getElementById('root')
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);
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