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：

五子棋

重新开始

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();

}

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