前言

Canvas API（画布）是在HTML5中新增的标签用于在网页实时生成图像，并且可以操作图像内容。

HTML5的Canvas画布功能真的很强大，与之对应的还有Svg，都是HTML5的核心之一。想了解更多，来看看Canvas和Svg的对比。

HTML主体

<!--难度级别，可以不要，默认简单-->
<div class="choose">
 <img src="images/bg.jpg" alt="" width="100%">
 <div class="choose-lv">
 <div class="levl">简单</div>
 <div class="levl">中级</div>
 <div class="levl">高级</div>
 </div>
</div>
<div class="choose_shade"></div>
<!--棋盘上方的提示等，可以不要-->
<div class="player">
 <div class="baiqi"><img src="images/baiqi.png" alt=""></div>
 <div class="tips" id="tips">黑子先行</div>
 <div class="heiqi"><img src="images/heiqi.png" alt=""></div>
 <div class="clear"></div>
</div>
<!--这里才是重点，棋盘和棋子-->
<div class="checkerboard">
 <canvas id="chess" width="450px" height="450px"></canvas>
 <canvas id="chess_board" width="450px" height="450px"></canvas>
 <canvas id="chess_pointer" width="450px" height="450px"></canvas>
</div>

JS

注释很详细，不做过多介绍了，注意赢棋算法，和难易程度算法

var num = 0;//连胜次数
var gameMode = false; // 模式，默认人机
var complexity = 1; // 人机时难度级别，默认简单
layer.confirm('请选择模式？', {
 btn: ['人机', '人人'],
 closeBtn: 0,
}, function(index, layero){
 gameMode=false;
 $('.choose').animate({
 opacity:1
 },800)
 $('.choose_shade').animate({
 opacity:0.6
 },800)
 layer.close(index);
}, function(index){
 gameMode=true;
 $('.choose_shade').animate({
 opacity:0,
 'z-index':-1
 },800)
 $('.choose').animate({
 opacity:0,
 'z-index':-1
 },800)
});
$('.levl').click(function(){
 var index=$(this).index() + 1;
 complexity=index;
 $('.choose').animate({
 opacity:0,
 'z-index':-1
 })
 $('.choose_shade').animate({
 opacity:0,
 'z-index':-1
 })
})
var canWidth = Math.min( 500 , $(window).width()-30);
var canHeight=canWidth;
var chess=document.getElementById('chess');
var context=chess.getContext('2d');
var chess_board=document.getElementById('chess_board');
var context2=chess_board.getContext('2d');
var chess_pointer=document.getElementById('chess_pointer');
var context3=chess_pointer.getContext('2d');
var pointerEnd=[];
// 根据屏幕大小绘制棋盘
$('#chess_pointer').css({
 width:canWidth,
 height:canHeight
})
$('#chess').css({
 width:canWidth,
 height:canHeight
})
$('#chess_board').css({
 width:canWidth,
 height:canHeight
})
$('.checkerboard').css({
 width:canWidth,
 height:canHeight
})
var utilW=canWidth/15;
var utilH=utilW;
var me;
var chessBoard;
var over;
//赢法数组
var wins=[];
//赢法统计数组
var myWin=[];
var computerWin=[];
for(var i=0;i<15;i++){
 wins[i]=[];
 for(var j=0;j<15;j++){
 wins[i][j]=[];
 }
}
//赢法种类索引
var count=0;
//赢法种类数组
// 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++;
 }
}
// 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++;
 }
}
var init=function(){
 context.clearRect(0,0,450,450);
 context3.clearRect(0,0,450,450);
 me=true;
 chessBoard=[];
 over=false;
 for(var i=0;i<15;i++){
 chessBoard[i]=[];
 for(var j=0;j<15;j++){
 chessBoard[i][j]=0;
 }
 }
 for(var i=0;i<count;i++){
 myWin[i]=0;
 computerWin[i]=0;
 }
}
init()
context2.strokeStyle="#dfdfdf";
var img=new Image();
img.src="images/logo.png";
img.onload=function(){
 drawChessBoard(); 
}
var drawChessBoard=function(){
 for(var i=0;i<15;i++){
 context2.moveTo(15+i*30,15);
 context2.lineTo(15+i*30,435);
 context2.stroke();
 context2.moveTo(15,15+i*30);
 context2.lineTo(435,15+i*30);
 context2.stroke();
 }
}
var oneStep=function(i,j,me){
 context3.clearRect(0,0,450,450);
 
 context.beginPath();
 context.arc(15+i*30,15+j*30,13,0, 2*Math.PI);
 context.closePath(); 
 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,"#C7C7C7");
 gradient.addColorStop(1,"#f9f9f9");
 }
 context.fillStyle=gradient;
 context.fill();
 context3.beginPath();
 context3.arc(15+i*30,15+j*30,15,0, 2*Math.PI);
 context3.closePath();
 context3.fillStyle="#FF3366";
 context3.fill(); 
}
chess.onclick=function(e){
 e.preventDefault();
 var x=e.offsetX;
 var y=e.offsetY;
 moveLater(x,y);
 
}
var moveLater=function(x,y){
 if(over){
 return;
 }
 var i=Math.floor(x/utilW);
 var j=Math.floor(y/utilW);
 if(chessBoard[i][j]==0){
 oneStep(i,j,me);
 if(gameMode){
 if (me) {
 chessBoard[i][j] = 1;
 for (var k = 0; k < count; k++) {
 if (wins[i][j][k]) {
 myWin[k]++;
 computerWin[k] = 6;
 if (myWin[k] == 5) {
 over = true;
 layer.open({
 title: '黑子赢了',
 content: '亲，再来一局试试！',
 btn: ['嗯', '不要'],
 yes: function(index){
 init();
 layer.close(index);
 }
 });
 }
 }
 }
 } else {
 chessBoard[i][j] = 2;
 for (var k = 0; k < count; k++) {
 if (wins[i][j][k]) {
 computerWin[k]++;
 myWin[k] = 6;
 if (computerWin[k] == 5) {
 over = true;
 layer.open({
 title: '白子赢了',
 content: '亲，再来一局试试！',
 btn: ['嗯', '不要'],
 yes: function(index){
 // location.reload();
 init();
 layer.close(index);
 }
 });
 }
 }
 }
 }
 me = !me;
 }else{
 chessBoard[i][j]=1;
 for(var k=0;k<count;k++){
 if(wins[i][j][k]){
 myWin[k]++;
 computerWin[k]=6;
 if(myWin[k]==5){
 over=true;
 $('.black').css({'z-index':2})
 layer.open({
 title: '你赢了',
 content: '亲，人家是你的了！',
 btn: ['要', '不要'],
 yes: function(index){
 // location.reload();
 num++;
 if(num>=3){
 $('#tips').html('常胜将军，已连胜'+num+'局');
 }else{
 $('#tips').html('你已连胜'+num+'局');
 }
 init();
 layer.close(index);
 }
 });
 }
 }
 }
 if(!over){
 $('#tips').html('电脑走棋，走着瞧');
 me=!me;
 computerAI();
 }
 }
 }
}
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(chessBoard[i][j]==0){
 for(var k=0;k<count;k++){
 if(wins[i][j][k]){
 if(complexity==1){
 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]+=100;
 }else if(computerWin[k]==2){
 computerScore[i][j]+=300;
 }else if(computerWin[k]==3){
 computerScore[i][j]+=600;
 }else if(computerWin[k]==4){
 computerScore[i][j]+=14000;
 }
 }else if(complexity==2){
 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]+=300;
 }else if(computerWin[k]==2){
 computerScore[i][j]+=500;
 }else if(computerWin[k]==3){
 computerScore[i][j]+=2100;
 }else if(computerWin[k]==4){
 computerScore[i][j]+=15000;
 }
 }else if(complexity==3){
 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]+=210;
 }else if(computerWin[k]==2){
 computerScore[i][j]+=850;
 }else if(computerWin[k]==3){
 computerScore[i][j]+=3000;
 }else if(computerWin[k]==4){
 computerScore[i][j]+=80000;
 }
 }
 
 }
 }
 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);
 chessBoard[u][v]=2;
 for(var k=0;k<count;k++){
 if(wins[u][v][k]){
 computerWin[k]++;
 myWin[k]=6;
 if(computerWin[k]==5){
 over=true;
 layer.open({
 title: '你输了',
 content: '不要放弃，再来一局吧！',
 btn: ['嗯', '不要'],
 yes: function(index){
 // location.reload();
 num=0;
 init();
 layer.close(index);
 }
 });
 }
 }
 }
 if(!over){
 me=!me;
 if(num==0){
 $('#tips').html('该你走棋了，我看好你');
 }
 }
}

CSS

body,html{
 margin:0;
 padding:0;
 position: relative;
 width: 100%;
 height: 100%;
 }
 .chess-content{
 padding-top: 48px;
 }
 canvas{
 display: block;
 margin:0px auto;
 box-shadow: -2px -2px 2px #efefef,5px 5px 5px #b9b9b9;
 }
 h3{
 margin:0;
 }
 .clear{
 clear: both;
 }
 .checkerboard{
 margin:0 auto;
 }
 #chess{
 position: absolute;
 z-index: 2;
 }
 #chess_board{
 position: absolute;
 z-index: 1;
 }
 #chess_pointer{
 position: absolute;
 z-index: 0;
 }
 .player{
 max-width: 500px;
 margin:0 auto;
 }
 .player .baiqi{
 float: left;
 }
 .player .baiqi{
 width:15%;
 }
 .player .tips{
 float: left;
 width: 70%;
 text-align: center;
 font-size: 18px;
 }
 .player .heiqi{
 width:15%;
 float: right;
 }
 .player div img{
 width: 100%;
 }
 .choose{
 position: absolute;
 z-index: 10;
 width: 80%;
 max-width: 500px;
 left: 50%;
 border: 1px solid #dfdfdf;
 border-radius: 5px;
 opacity: 0;
 top: 50%;
 transform: translateY(-50%);
 overflow: hidden;
 }
 .choose img{
 width: 100%;
 }
 .choose_shade{
 width: 100%;
 height: 100%;
 position: absolute;
 z-index: 9;
 background: #000;
 opacity: 0.6;
 margin:0;
 }
 .choose-lv{
 position: absolute;
 top: 28%;
 width: 100%;
 }
 .choose-lv div{
 margin: 19px 0px 10px 52%;
 width: 40%;
 text-align: center;
 border-radius: 5px;
 border: 1px solid #F2F2F2;
 color: #fff;
 text-shadow: 10px 7px 17px;
 font-weight: bold;
 line-height: 35px;
 z-index: 1;
 position: relative;
 background: rgba(0, 0, 0, 0.18);
 cursor: pointer;
 }
 .black{
 float: right;
 position: absolute;
 z-index: 1;
 width: 40%;
 max-width: 400px;
 bottom:0;
 }
 .black img{
 width: 100%;
 }
 .b_img3,.b_img4{
 right:0;
 }
 .tips{
 line-height: 75px;
 }

需要源码的同学，点击下方“了解更多”！更多资源敬请关注！