本文实例讲述了JS+canvas实现的五子棋游戏。分享给大家供大家参考，具体如下：
运行效果图：
html代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>五子棋</title>
<link rel="stylesheet" type="text/css" href="css/style.css" rel="external nofollow" />
</head>
<body>
<canvas id="chess" width="450px" height="450px"></canvas>
<div id='restart' class="restart">
<span>重新开始</span>
</div>
<script src="js/script.js" type="text/javascript" charset="utf-8"></script>
</body>
</html>
style.css代码如下：
canvas{
display: block;
margin: 50px auto;
box-shadow: -2px -2px 2px #efefef, 5px 5px 5px #b9b9b9;
}
.restart{
text-align: center;
}
.restart>span{
display: inline-block;
padding: 10px 20px;
color: #fff;
background-color: #45c01a;
border-radius: 5px;
}
script.js代码如下：
var over = false;
var me = true; //我
var chressBord = [];//棋盘
for(var i = 0; i < 15; i++){
chressBord[i] = [];
for(var j = 0; j < 15; j++){
chressBord[i][j] = 0;
}
}
//赢法的统计数组
var myWin = [];
var computerWin = [];
//赢法数组
var wins = [];
for(var i = 0; i < 15; i++){
wins[i] = [];
for(var j = 0; j < 15; j++){
wins[i][j] = [];
}
}
var count = 0; //赢法总数
//横线赢法
for(var i = 0; i < 15; i++){
for(var j = 0; j < 11; j++){
for(var k = 0; k < 5; k++){
wins[i][j+k][count] = true;
}
count++;
}
}
//竖线赢法
for(var i = 0; i < 15; i++){
for(var j = 0; j < 11; j++){
for(var k = 0; k < 5; k++){
wins[j+k][i][count] = true;
}
count++;
}
}
//正斜线赢法
for(var i = 0; i < 11; i++){
for(var j = 0; j < 11; j++){
for(var k = 0; k < 5; k++){
wins[i+k][j+k][count] = true;
}
count++;
}
}
//反斜线赢法
for(var i = 0; i < 11; i++){
for(var j = 14; j > 3; j--){
for(var k = 0; k < 5; k++){
wins[i+k][j-k][count] = true;
}
count++;
}
}
for(var i = 0; i < count; i++){
myWin[i] = 0;
computerWin[i] = 0;
}
var chess = document.getElementById("chess");
var context = chess.getContext('2d');
context.strokeStyle = '#bfbfbf'; //边框颜色
var logo = new Image();
logo.src = 'img/logo.png';
logo.onload = function(){
context.drawImage(logo,0,0,450,450);
drawChessBoard();
}
document.getElementById("restart").onclick = function(){
window.location.reload();
}
chess.onclick = function(e){
if(over){
return;
}
if(!me){
return;
}
var x = e.offsetX;
var y = e.offsetY;
var i = Math.floor(x / 30);
var j = Math.floor(y / 30);
if(chressBord[i][j] == 0){
oneStep(i,j,me);
chressBord[i][j] = 1;//我
for(var k = 0; k < count; k++){
if(wins[i][j][k]){
myWin[k]++;
computerWin[k] = 6;//这个位置对方不可能赢了
if(myWin[k] == 5){
window.alert('你赢了');
over = true;
}
}
}
if(!over){
me = !me;
computerAI();
}
}
}
//计算机下棋
var computerAI = function (){
var myScore = [];
var computerScore = [];
var max = 0;
var u = 0, v = 0;
for(var i = 0; i < 15; i++){
myScore[i] = [];
computerScore[i] = [];
for(var j = 0; j < 15; j++){
myScore[i][j] = 0;
computerScore[i][j] = 0;
}
}
for(var i = 0; i < 15; i++){
for(var j = 0; j < 15; j++){
if(chressBord[i][j] == 0){
for(var k = 0; k < count; k++){
if(wins[i][j][k]){
if(myWin[k] == 1){
myScore[i][j] += 200;
}else if(myWin[k] == 2){
myScore[i][j] += 400;
}else if(myWin[k] == 3){
myScore[i][j] += 2000;
}else if(myWin[k] == 4){
myScore[i][j] += 10000;
}
if(computerWin[k] == 1){
computerScore[i][j] += 220;
}else if(computerWin[k] == 2){
computerScore[i][j] += 420;
}else if(computerWin[k] == 3){
computerScore[i][j] += 2100;
}else if(computerWin[k] == 4){
computerScore[i][j] += 20000;
}
}
}
if(myScore[i][j] > max){
max = myScore[i][j];
u = i;
v = j;
}else if(myScore[i][j] == max){
if(computerScore[i][j] > computerScore[u][v]){
u = i;
v = j;
}
}
if(computerScore[i][j] > max){
max = computerScore[i][j];
u = i;
v = j;
}else if(computerScore[i][j] == max){
if(myScore[i][j] > myScore[u][v]){
u = i;
v = j;
}
}
}
}
}
oneStep(u,v,false);
chressBord[u][v] = 2;
for(var k = 0; k < count; k++){
if(wins[u][v][k]){
computerWin[k]++;
myWin[k] = 6;//这个位置对方不可能赢了
if(computerWin[k] == 5){
window.alert('计算机赢了');
over = true;
}
}
}
if(!over){
me = !me;
}
}
//绘画棋盘
var drawChessBoard = function(){
for(var i = 0; i < 15; i++){
context.moveTo(15 + i * 30 , 15);
context.lineTo(15 + i * 30 , 435);
context.stroke();
context.moveTo(15 , 15 + i * 30);
context.lineTo(435 , 15 + i * 30);
context.stroke();
}
}
//画旗子
var oneStep = function(i,j,me){
context.beginPath();
context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);//画圆
context.closePath();
//渐变
var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
if(me){
gradient.addColorStop(0,'#0a0a0a');
gradient.addColorStop(1,'#636766');
}else{
gradient.addColorStop(0,'#d1d1d1');
gradient.addColorStop(1,'#f9f9f9');
}
context.fillStyle = gradient;
context.fill();
}
PS：这里再为大家推荐另一款本站的js版五子棋游戏供大家参考（其AI相对简单一些）
在线五子棋游戏：
http://tools.softyun.net/games/wuziqi
希望本文所述对大家JavaScript程序设计有所帮助。
