看到一些曾经只会灌水的网友，在学习了前端之后，已经能写出下载量几千几万的脚本、样式，帮助大众，成为受欢迎的人，感觉满羡慕的。我也想学会前端技术，变得受欢迎呀。于是心血来潮，开始学习前端知识，并写下了这个小练习。
基本思路是这样的：
使用Canvas绘制棋盘、棋子。
用二维数组保存棋盘状态。
设置一个flag，用以标识落子顺序。
点击时，在数组中检测当前点击位置是否存在棋子，若存在，则不落子；如游戏已结束，亦不落子。
落子时，更新数组，并将当前落子所在的行、列、左上-右下列、左下-右上列四个方向的棋盘状态写入到一维数组中，用以判断新落子是否形成了五子连珠。
若形成了五子连珠，提示胜利，并结束游戏；反之，则交换顺序，继续进行游戏。
效果图：
代码如下：
1 <!DOCTYPE html> 2 <html lang="zh-CN"> 3 <meta charset="utf-8"> 4 <head><title>五子棋</title></head> 5 <body> 6 <canvas id="myCanvas" width="560" height="560" style="border:3px solid black;"> 7 您的浏览器不支持 HTML5 canvas 标签。</canvas> <br/> 8 <button id="reset" onclick="controller.init(ctx)">重置</button> 9 </body> 10 <script> 11 var controller = { 12 round:true, 13 color:"black", 14 whiteTable:new Array(), 15 blackTable:new Array(), 16 row:0, 17 col:0, 18 over:false, 19 trans:function() {
20 this.round = !this.round; 21 if (!this.round) { 22 this.blackTable[this.row][this.col] = 1; 23 this.ifWin(this.blackTable) 24 this.color = "white"; 25 } 26 else { 27 this.whiteTable[this.row][this.col] = 1; 28 this.ifWin(this.whiteTable)
29 this.color = "black"; 30 } 31 }, 32 ifWin:function(table) {
33 var arr1 = new Array(); 34 var arr2 = new Array(); 35 var arr3 = new Array(); 36 var arr4 = new Array(); 37 var n = 0;
38 for(x = 0; x<= lineNums; x++) {
39 for(y = 0; y <= lineNums; y++)
40 {
41 var x1 = this.row - n; 42 var x2 = this.row + n; 43 var y1 = this.col - n; 44 var y2 = this.col + n; 45 if(y == this.col) { 46 arr1[x] = table[x][y]; 47 } 48 if(x == this.row) { 49 arr2[y] = table[x][y]; 50 } 51 } 52 if(this.inBounds(x1) && this.inBounds(y2)) { 53 arr3[x1] = table[x1][y2]; 54 } 55 if(this.inBounds(x1) && this.inBounds(y1)) { 56 arr4[x1] = table[x1][y1];
57 } 58 if(this.inBounds(x2) && this.inBounds(y1)) { 59 arr3[x2] = table[x2][y1]; 60 } 61 if(this.inBounds(x2) && this.inBounds(y2)) { 62 arr4[x2] = table[x2][y2];
63 } 64 n = n + 1; 65 }
66 this.getSum(arr1, this.row); 67 this.getSum(arr2, this.col); 68 this.getSum(arr3, this.row); 69 this.getSum(arr4, this.row); 70 }, 71 inBounds:function(i) { 72 if(i>=0 && i<=15){ 73 return true; 74 } 75 else{ 76 return false;
77 }
78 }, 79 getSum:function(array, pos) { 80 num = 5; 81 posr = pos + 1; 82 while(num > 0){ 83 if(array[pos]>0 && this.inBounds(pos)) { 84 num = num - 1; 85 pos = pos - 1; 86 } 87 else{ 88 break; 89 } 90 } 91 while(num > 0){ 92 if(array[posr]>0 && this.inBounds(pos)) { 93 num = num - 1; 94 posr = posr + 1; 95 } 96 else { 97 break; 98 }
99 }100 if(num == 0) {101 this.over = true;102 this.gameOver();103 }
104 },105 exist:function(x, y) {106 this.row = x / ratio;107 this.col = y / ratio;108 var nums = this.whiteTable[this.row][this.col] + this.blackTable[this.row][this.col];109 if( nums > 0 {110 return true;111 }112 else{113 return false;114 }115 },116 gameOver:function() {117 ctx.font="30px Arial";118 ctx.fillStyle = "#FF0000";119 if(this.round) {120 ctx.fillText("白棋胜利",240,240);121 }122 else {123 ctx.fillText("黑棋胜利",240,240);124 }125 },126 init:function() {127 this.round = true;128 this.color = "black";129 this.over = false;130 this.drawBoard();131 for(i = 0; i<= lineNums; i++) {
132 this.whiteTable[i]=new Array();133 this.blackTable[i]=new Array();134 for(n = 0; n <= lineNums; n++) {
135 this.whiteTable[i][n]=0;
136 this.blackTable[i][n]=0;137 }
138 }
139 },140 drawBoard:function() {141 ctx.beginPath();142 ctx.clearRect(0,0,width,width);143 ctx.fillStyle = "#FFBB00";144 ctx.fillRect(0,0,width,width);145 for(var i = 1; i < (lineNums - 1); i++) {146 ctx.moveTo(i * ratio, 0);147 ctx.lineTo(i * ratio, width);148 ctx.stroke();149 ctx.moveTo(0, i * ratio);150 ctx.lineTo(width, i * ratio);151 ctx.stroke();152 }153 },154 drawPiece:function(posX, posY) {155 ctx.beginPath();156 ctx.arc(posX, posY, ratio/2, 0, 2*Math.PI);157 ctx.fillStyle = this.color;158 ctx.fill();159 ctx.stroke();
160 }161 };
162 //获取点击位置163 function getMousePos(canvas, evt) {
164 var rect = canvas.getBoundingClientRect();
165 return {
166 x: evt.clientX - rect.left * (canvas.width / rect.width),167 y: evt.clientY - rect.top * (canvas.height / rect.height)168 }169 }170 171 function getNode(pos) {172 return ((pos / ratio).toFixed()) * ratio;173 }174 175 var canvas = document.getElementById("myCanvas");176 var ctx = canvas.getContext("2d");177 var lineNums = 15;178 var ratio = 40;179 var width = (lineNums - 1) * ratio;180 181 controller.init();
182 183 canvas.addEventListener("click", function (evt) {
184 var mousePos = getMousePos(canvas, evt);
185 mousePos.x = getNode(mousePos.x);186 mousePos.y = getNode(mousePos.y);187 var exist = controller.exist(mousePos.x, mousePos.y);188 if (!exist && !controller.over) {189 controller.drawPiece(mousePos.x, mousePos.y);
190 controller.trans();191 }
192 }, false);
193 </script>194 </html>
自己写的HTML5 Canvas + Javascript五子棋
原文地址：http://12883930.blog.51cto.com/12873930/1922702
