本文主要和大家分享js实现五子棋代码，通过canvas绘制棋盘与棋子，通过js代码实现逻辑。
index.html代码：
<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>五子棋</title> <link rel="stylesheet" type="text/css" href="css/style.css"></head><body> <canvas id="chess" width="450px" height="450px"></canvas> <p id='restart' class="restart"> <span>重新开始</span> </p> <script type="text/javascript" src="js/script.js"></script></body></html>
style.css代码：
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: #C92027; border-radius: 5px;}script.js代码：
//判断是否结束var over = false;//判断落子方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;
}//获得canvas对象var chess = document.getElementById("chess");var context = chess.getContext('2d');
context.strokeStyle = '#bfbfbf'; //边框颜色var logo = new Image();
logo.src = 'images/logo.jpg';
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();
}下载本文