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基于JS实现经典的井字棋游戏

作者：莫笑沉吟　　发布时间：2024-04-28 09:51:10　

标签：JS,井字棋,游戏

井字棋作为我们在上学时代必玩的一款连珠游戏，你知道如何做到先手必然不会输吗？今天我们就用HTML、css、js来实现一款井字棋游戏。

先看成品

游戏初始化界面：

玩家获胜

AI电脑获胜

思路

生成棋盘

通过表格生成一个3*3的表格
然后通过css属性隐藏部分边框实现井字棋盘

重新开始

清空文本数列删除属性

玩家落子

通过玩家点击获取id
通过id将点击的表格块设置为O

电脑落子

通过算法来实现电脑最适合的块id然后落子

代码

HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>井字棋</title>
<link rel="stylesheet" href="css.css" rel="external nofollow" />
</head>
<body>
<table>
<tr>
<td class="cell" id="0"></td>
<td class="cell" id="1"></td>
<td class="cell" id="2"></td>
</tr>
<tr>
<td class="cell" id="3"></td>
<td class="cell" id="4"></td>
<td class="cell" id="5"></td>
</tr>
<tr>
<td class="cell" id="6"></td>
<td class="cell" id="7"></td>
<td class="cell" id="8"></td>
</tr>
</table>
<div class="endgame">
<div class="text"></div>
</div>
<button onclick="startGame()">重新开始</button>
<script src="js.js"></script>
</body>
</html>

CSS

* {
margin: 0;
padding: 0;
}
button {
position: absolute;
position: absolute;
left: 50％;
margin-left: -65px;
top: 50px;
}
td {
border: 2px solid #333;
width: 100px;
height: 100px;
text-align: center;
vertical-align: middle;
font-family: '微软雅黑';
font-style: italic;
font-size: 70px;
cursor: pointer;
}
table {
/*margin: 30px auto;*/
position: absolute;
left: 40％;
top: 100px;
border-collapse: collapse;
}

table tr:first-child td {
border-top: 0;
}

table tr:last-child td {
border-bottom: 0;
}

table tr td:first-child {
border-left: 0;
}

table tr td:last-child {
border-right: 0;
}

.endgame {
display: none;
width: 200px;
height: 120px;
background-color: rgba(205, 132, 65, 0.8);
position: absolute;
left: 40％;
top: 180px;
margin-left: 50px;
text-align: center;
border-radius: 5px;
color: white;
font-size: 2em;
}

js

var origBoard;
const huPlayer = 'O';
const aiPlayer = 'X';
const winCombos = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[6, 4, 2]
]
/*获取元素*/
const cells = document.querySelectorAll(".cell");
startGame();

function startGame () {
document.querySelector(".endgame").style.display = "none";
//设置阵列点创建9个数组元素，元素的键0到8
origBoard = Array.from(Array(9).keys());
//console.log(origBoard);
for (var i = 0; i < cells.length; i++) {
//把文本先设置为空
cells[i].innerHTML = "";
//删除属性知道已经有人赢了
cells[i].style.removeProperty('background-color');
//点击方块
cells[i].addEventListener('click', turnClick, false);
}
}

function turnClick (square) {
//记住原来走过的方块
if (typeof origBoard[square.target.id] == 'number') {
//人类玩家点击
turn(square.target.id, huPlayer);
//由人类转向AI玩家
if (!checkTie()) {
//电脑玩家将棋子放到最合适的地方
turn(bestStep(), aiPlayer);
}
}

}

function turn (squareId, player) {
//这些id给玩家
origBoard[squareId] = player;
document.getElementById(squareId).innerHTML = player;
//让游戏进行检查
var gameWin = checkWin(origBoard, player);
if (gameWin) {
gameOver(gameWin);
}
}
//判断胜利
function checkWin (board, player) {
let plays = board.reduce((a, e, i) =>
(e === player) ? a.concat(i) : a, [])
let gameWin = null;
//如果是属于之前winCombos胜利组合
for (let [index, win] of winCombos.entries()) {
if (win.every(Element => plays.indexOf(Element) > -1)) {
//现在我们知道是哪一个组合胜利了
gameWin = { index: index, player: player };
break;
}
}
return gameWin;
}
/*游戏结束*/
function gameOver (gameWin) {
for (let index of winCombos[gameWin.index]) {
//人类获胜则为蓝色
document.getElementById(index).style.backgroundColor =
gameWin.player == huPlayer ? "blue" : "red";
}
/*事件 * 删除单击，已经结束了，不能再点击*/
for (var i = 0; i < cells.length; i++) {
cells[i].removeEventListener('click', turnClick, false);
}
declareWinner(gameWin.player == huPlayer ? "你赢了" : "你输了");
}

function emptySquares () {
//过滤每一个元素,如果元素为number，返回所有方块
return origBoard.filter(s => typeof s == 'number');
}

/*AI最优步骤*/
function bestStep () {
//智能AI
return minmax(origBoard, aiPlayer).index;
}
//检查是否是平局
function checkTie () {
if (emptySquares().length == 0) {
for (var i = 0; i < cells.length; i++) {
cells[i].style.backgroundColor = "green";
cells[i].removeEventListener('click', turnClick, false);
}
//谁获胜了
// declareWinner("玩家获胜");
return true;
} else {
//平局
return false;
}

}

function declareWinner (who) {
document.querySelector(".endgame").style.display = 'block';
document.querySelector(".endgame .text").innerHTML = who;
}

function minmax (newBoard, player) {
//找到索引，空方块功能设置为a
var availSpots = emptySquares(newBoard);

if (checkWin(newBoard, player)) {
return { score: -10 };
} else if (checkWin(newBoard, aiPlayer)) {
return { score: 20 };
} else if (availSpots.length === 0) {
return { score: 0 };
}
//之后进行评估
var moves = [];
//收集每个动作时的空白点
for (var i = 0; i < availSpots.length; i++) {
//然后设置空的索引号
var move = {};
move.index = newBoard[availSpots[i]];
newBoard[availSpots[i]] = player;

if (player == aiPlayer) {
//存储对象，包括得分属性
var result = minmax(newBoard, huPlayer);
move.score = result.score;
} else {
//存储对象，包括得分属性
var result = minmax(newBoard, aiPlayer);
move.score = result.score;
}

newBoard[availSpots[i]] = move.index;

moves.push(move);
}
var bestMove;
//如果是AI玩家，以非常低的数字和循环通过
if (player === aiPlayer) {
var bestScore = -1000;
for (var i = 0; i < moves.length; i++) {
if (moves[i].score > bestScore) {
bestScore = moves[i].score;
bestMove = i;
}
}
} else {
var bestScore = 1000;
for (var i = 0; i < moves.length; i++) {
if (moves[i].score < bestScore) {
bestScore = moves[i].score;
bestMove = i;
}
}
}

return moves[bestMove];
}

来源：https://juejin.cn/post/7089813654962438174

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