react井字棋1.0
js部分
import React, { useState, useEffect } from 'react';
import ReactDOM from 'react-dom';
import './index.css';
// 单个格子
function Square (props) {
const lightLIst = props.winlist
const num = props.num
const [light, setLight] = useState(false)
useEffect(() => {
if (!lightLIst) return setLight(false)
for (const key in lightLIst) {
if (lightLIst[key] === num) return setLight(true)
}
}, [lightLIst, num])
const cName = 'light'
return (
<button className={`square ${light ? cName : ''}`} onClick={props.onClick}>
{props.value}
</button>
)
}
// 生成九宫格的组件
class Board extends React.Component {
renderSquare(i, y, x) {
return <Square
key={`${i}${y}`}
winlist={this.props.winlist}
num={i}
value={this.props.squares[i]}
onClick={() => this.props.onClick(i, y, x)}
/>
}
BoardList () {
const row = []
for (const arr of this.props.list) {
row.push(<div key={`${arr[0][1]}${arr[0][2]}`}>
{arr.map(item => {
return this.renderSquare(item[0], item[1], item[2])
})}
</div>)
}
return row
}
render() {
return (
<div>
{this.BoardList()}
</div>
)
}
}
// 游戏组件
class Game extends React.Component {
constructor(props) {
super(props);
this.state = {
list: [
[
[0, 3, 1],
[1, 3, 2],
[2, 3, 3]
],
[
[3, 2, 1],
[4, 2, 2],
[5, 2, 3]
],
[
[6, 1, 1],
[7, 1, 2],
[8, 1, 3]
]
],
history: [
{
squares: Array(9).fill(null),
xIndex: 0,
yIndex: 0,
boldNum: 0
}
],
stepNumber:0,
xIsNext: true,
}
}
handleClick(i, y, x) {
const history = this.state.history.slice(0, this.state.stepNumber + 1)
const current = history[history.length - 1]
const squares = current.squares.slice()
if (calculateWinner(squares) || squares[i]) return
squares[i] = this.state.xIsNext ? 'X' : 'O'
this.setState({
history: history.concat([{
squares: squares,
yIndex: y,
xIndex: x,
boldNum: history.length
}]),
stepNumber: history.length,
xIsNext: !this.state.xIsNext,
})
}
reverseHistory() {
const history = this.state.history.slice()
const newArr = []
for (const key in history) {
newArr.unshift(history[key])
}
this.setState({
history: newArr
})
}
jumpTo(move) {
this.setState({
stepNumber: move,
xIsNext: (move % 2) === 0
})
}
render() {
const history = this.state.history
const current = history[this.state.stepNumber]
const winList = calculateWinner(current.squares)
let winStatus
winStatus = winList ? winList[0] : 0
const winner = current.squares[winStatus]
const lastStep = current.squares.filter((item) => {
return item === null
})
const moves = history.map((step, move) => {
const desc = step.boldNum ?
`Go to move #${step.boldNum}${winList}(x:${step.xIndex},y:${step.yIndex})`:
'Go to game start'
return (
<li key={`${step.boldNum}`}
className={[step.boldNum === this.state.stepNumber ? 'bold' : '']}>
<button onClick={() => this.jumpTo(move)}>{desc}</button>
</li>
)
})
let status
if (winList) {
status = 'Winner：' + winner
} else {
if (!winList && lastStep.length < 1) {
status = '平局'
} else {
status = 'Next player:' + (this.state.xIsNext ? 'X' : "0")
}
}
return (
<div className="game">
<div className="game-board">
<Board
list={this.state.list}
winlist={winList}
squares={current.squares}
onClick={(i, x, y) => this.handleClick(i, x, y)}
/>
</div>
<div className="game-info">
<div>{status}</div>
<ol>{moves}</ol>
</div>
<div>
<button onClick={() => this.reverseHistory()}>
改变排序
</button>
</div>
</div>
)
}
}
// ========================================
// 页面的根元素
ReactDOM.render(
<Game />,
document.getElementById('root')
);
// 规定井字棋胜负的方法
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 lines[i];
}
}
return null;
}
css部分
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;
34px;
}
.square:focus {
outline: none;
}
.kbd-navigation .square:focus {
background: #ddd;
}
.game {
display: flex;
flex-direction: row;
}
.game-info {
margin-left: 20px;
}
.bold{
font-weight: bold;
}
.light{
background: chartreuse!important;
}
react井字棋2.0
js部分
主页面
import React, { useState, useEffect } from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import { CanvasBox } from './canvas'
// 单个格子
function Square (props) {
const lightList = props.winlist
const num = props.num
const [light, setLight] = useState(false)
// 做判断是否处在胜利的三颗棋子中，是则高亮
useEffect(() => {
if (!lightList) return setLight(false)
for (const key in lightList) {
if (lightList[key] === num) return setLight(true)
}
}, [lightList, num])
const str = props.value
const winKey = props.winKey
const canvasSquare = React.createRef()
// 设置画布数据
const setCanvasFn = (canvasSquare, str, lightList, winKey) => {
const cbr = canvasSquare.current
if (cbr.getContext){
const cb = cbr.getContext('2d')
// 清空画布
cbr.height = cbr.height
// 显示字体
if (str) {
cb.beginPath()
cb.fillStyle = 'black'
cb.font = '48px sans-serif'
if (str === 'O') cb.fillText(str, 16,52, 60)
if (str === 'X') cb.fillText(str, 20,52, 60)
cb.closePath()
}
// 产生竖线
const h = () => {
cb.moveTo(0, 34)
cb.lineTo(68,34)
cb.lineWidth = 8
cb.stroke()
}
// 产生横线
const w = () => {
cb.moveTo(34, 0)
cb.lineTo(34,68)
cb.lineWidth = 8
cb.stroke()
}
// 产生左斜线
const l = () => {
cb.moveTo(0, 0)
cb.lineTo(68,68)
cb.lineWidth = 8
cb.stroke()
}
// 产生右斜线
const r = () => {
cb.moveTo(68, 0)
cb.lineTo(0,68)
cb.lineWidth = 8
cb.stroke()
}
// 游戏出现胜利结果后，使用条件判断哪个格子该产生什么线
if (lightList) {
for (const key in lightList) {
if (lightList[key] === num) {
switch (winKey) {
case 0:
case 1:
case 2:
h()
break
case 3:
case 4:
case 5:
w()
break
case 6:
l()
break
case 7:
r()
break
default:
return ''
}
}
}
}
}
}
useEffect(() => {
setCanvasFn(canvasSquare, str, lightList, winKey)
}, [str, lightList, canvasSquare, winKey])
const cName = 'light'
return (
<canvas ref={canvasSquare} className={`square ${light ? cName : ''}`} width="68px" height="68px" onClick={props.onClick}>
{props.value}
</canvas>
)
}
// 生成九宫格的组件
class Board extends React.Component {
renderSquare(i, y, x) {
return <Square
key={`${i}${y}`}
winKey={this.props.winKey}
winlist={this.props.winlist}
num={i}
value={this.props.squares[i]}
onClick={() => this.props.onClick(i, y, x)}
/>
}
BoardList () {
const row = []
for (const arr of this.props.list) {
row.push(<div key={`${arr[0][1]}${arr[0][2]}`}>
{arr.map(item => {
return this.renderSquare(item[0], item[1], item[2])
})}
</div>)
}
return row
}
render() {
return (
<div>
{this.BoardList()}
</div>
)
}
}
// 游戏组件
class Game extends React.Component {
constructor(props) {
super(props);
this.state = {
list: [
[
[0, 3, 1],
[1, 3, 2],
[2, 3, 3]
],
[
[3, 2, 1],
[4, 2, 2],
[5, 2, 3]
],
[
[6, 1, 1],
[7, 1, 2],
[8, 1, 3]
]
],
history: [
{
squares: Array(9).fill(null),
xIndex: 0,
yIndex: 0,
boldNum: 0
}
],
stepNumber:0,
xIsNext: true,
}
}
handleClick(i, y, x) {
const history = this.state.history.slice(0, this.state.stepNumber + 1)
const current = history[history.length - 1]
const squares = current.squares.slice()
if ((calculateWinner(squares) && calculateWinner(squares).arr) || squares[i]) return
squares[i] = this.state.xIsNext ? 'X' : 'O'
this.setState({
history: history.concat([{
squares: squares,
yIndex: y,
xIndex: x,
boldNum: history.length
}]),
stepNumber: history.length,
xIsNext: !this.state.xIsNext,
})
}
reverseHistory() {
const history = this.state.history.slice()
const newArr = []
for (const key in history) {
newArr.unshift(history[key])
}
this.setState({
history: newArr
})
}
jumpTo(move) {
this.setState({
stepNumber: move,
xIsNext: (move % 2) === 0
})
}
render() {
const history = this.state.history
const current = history[this.state.stepNumber]
const winKey = calculateWinner(current.squares) && calculateWinner(current.squares).key
const winList = calculateWinner(current.squares) && calculateWinner(current.squares).arr
let winStatus
winStatus = winList ? winList[0] : 0
const winner = current.squares[winStatus]
const lastStep = current.squares.filter((item) => {
return item === null
})
const moves = history.map((step, move) => {
const desc = step.boldNum ?
`Go to move #${step.boldNum}${winList}(x:${step.xIndex},y:${step.yIndex})`:
'Go to game start'
return (
<li key={`${step.boldNum}`}
className={[step.boldNum === this.state.stepNumber ? 'bold' : '']}>
<button onClick={() => this.jumpTo(move)}>{desc}</button>
</li>
)
})
let status
if (winList) {
status = 'Winner：' + winner
} else {
if (!winList && lastStep.length < 1) {
status = '平局'
} else {
status = 'Next player:' + (this.state.xIsNext ? 'X' : "0")
}
}
return (
<div className="game">
<div className="game-board">
<Board
list={this.state.list}
winKey={winKey}
winlist={winList}
squares={current.squares}
onClick={(i, x, y) => this.handleClick(i, x, y)}
/>
</div>
<div className="game-info">
<div>{status}</div>
<ol>{moves}</ol>
</div>
<div className="game-info">
<button onClick={() => this.reverseHistory()}>
改变排序
</button>
</div>
<div className="game-info">
<CanvasBox/>
</div>
</div>
)
}
}
// ========================================
// 页面的根元素
ReactDOM.render(
<Game />,
document.getElementById('root')
);
// 规定井字棋胜负的方法
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]) {
const data = {
arr: lines[i],
key: i
}
return data
}
}
return null;
}
次要组件(可删除)
import React, {useEffect} from 'react'
export function CanvasBox() {
const canvasBox = React.createRef()
useEffect(() => {
const canvas = canvasBox.current
if (canvas.getContext) {
const ctx = canvas.getContext('2d')
ctx.fillStyle = '#ff0000'
ctx.fillRect(33,0,66,33)
ctx.moveTo(33,0)
ctx.lineTo(33,99)
ctx.stroke()
ctx.moveTo(66,0)
ctx.lineTo(66,99)
ctx.stroke()
ctx.moveTo(0,33)
ctx.lineTo(99,33)
ctx.stroke()
ctx.moveTo(0,66)
ctx.lineTo(99,66)
ctx.stroke()
ctx.fillStyle='#ff0000'
ctx.beginPath()
ctx.arc(49.5,49.5,14,0,Math.PI*2,true)
ctx.closePath()
ctx.fill()
ctx.beginPath()
ctx.fillStyle='white'
ctx.font='24px'
ctx.fillText('⚪',42.5,52.5)
ctx.closePath()
}
})
return(
<div>
<canvas ref={canvasBox} id='canvas-box' width='99px' height='99px' style={{ border: '1px solid #c3c3c3' }}>
您的浏览器不支持canvas元素
</canvas>
<canvas className='square' width='33px' height='33px' >
您的浏览器不支持canvas元素
</canvas>
</div>
)
}
css部分
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;
height: 34px;
box-sizing: border-box;
padding: 0;
34px;
}
.square:focus {
outline: none;
}
.kbd-navigation .square:focus {
background: #ddd;
}
.game {
display: flex;
flex-direction: row;
}
.game-info {
margin-left: 20px;
}
.bold{
font-weight: bold;
}
.light{
background: chartreuse!important;
}