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：
<!DOCTYPE html>
<html lang="zh-CN">
<meta charset="utf-8">
<head><title>五子棋</title></head>
<body>
<canvas id="myCanvas" width="560" height="560" style="border:3px solid black;">
您的浏览器不支持 HTML5 canvas 标签。</canvas> <br/>
<button id="reset" onclick="controller.init(ctx)">重置</button>
</body>
<script>
var controller = {
round:true,
color:"black",
whiteTable:new Array(),
blackTable:new Array(),
row:0,
col:0,
over:false,
trans:function() {
this.round = !this.round;
if (!this.round) {
this.blackTable[this.row][this.col] = 1;
this.ifWin(this.blackTable)
this.color = "white";
}
else {
this.whiteTable[this.row][this.col] = 1;
this.ifWin(this.whiteTable)
this.color = "black";
}
},
ifWin:function(table) {
var arr1 = new Array();
var arr2 = new Array();
var arr3 = new Array();
var arr4 = new Array();
var n = 0;
for(x = 0; x<= lineNums; x++) {
for(y = 0; y <= lineNums; y++)
{
var x1 = this.row - n;
var x2 = this.row + n;
var y1 = this.col - n;
var y2 = this.col + n;
if(y == this.col) {
arr1[x] = table[x][y];
}
if(x == this.row) {
arr2[y] = table[x][y];
}
}
if(this.inBounds(x1) && this.inBounds(y2)) {
arr3[x1] = table[x1][y2];
}
if(this.inBounds(x1) && this.inBounds(y1)) {
arr4[x1] = table[x1][y1];
}
if(this.inBounds(x2) && this.inBounds(y1)) {
arr3[x2] = table[x2][y1];
}
if(this.inBounds(x2) && this.inBounds(y2)) {
arr4[x2] = table[x2][y2];
}
n = n + 1;
}
this.getSum(arr1, this.row);
this.getSum(arr2, this.col);
this.getSum(arr3, this.row);
this.getSum(arr4, this.row);
},
inBounds:function(i) {
if(i>=0 && i<=15){
return true;
}
else{
return false;
}
},
getSum:function(array, pos) {
num = 5;
posr = pos + 1;
while(num > 0){
if(array[pos]>0 && this.inBounds(pos)) {
num = num - 1;
pos = pos - 1;
}
else{
break;
}
}
while(num > 0){
if(array[posr]>0 && this.inBounds(pos)) {
num = num - 1;
posr = posr + 1;
}
else {
break;
}
}
if(num == 0) {
this.over = true;
this.gameOver();
}
},
exist:function(x, y) {
this.row = x / ratio;
this.col = y / ratio;
var nums = this.whiteTable[this.row][this.col] + this.blackTable[this.row][this.col];
if( nums > 0 {
return true;
}
else{
return false;
}
},
gameOver:function() {
ctx.font="30px Arial";
ctx.fillStyle = "#FF0000";
if(this.round) {
ctx.fillText("白棋胜利",240,240);
}
else {
ctx.fillText("黑棋胜利",240,240);
}
},
init:function() {
this.round = true;
this.color = "black";
this.over = false;
this.drawBoard();
for(i = 0; i<= lineNums; i++) {
this.whiteTable[i]=new Array();
this.blackTable[i]=new Array();
for(n = 0; n <= lineNums; n++) {
this.whiteTable[i][n]=0;
this.blackTable[i][n]=0;
}
}
},
drawBoard:function() {
ctx.beginPath();
ctx.clearRect(0,0,width,width);
ctx.fillStyle = "#FFBB00";
ctx.fillRect(0,0,width,width);
for(var i = 1; i < (lineNums - 1); i++) {
ctx.moveTo(i * ratio, 0);
ctx.lineTo(i * ratio, width);
ctx.stroke();
ctx.moveTo(0, i * ratio);
ctx.lineTo(width, i * ratio);
ctx.stroke();
}
},
drawPiece:function(posX, posY) {
ctx.beginPath();
ctx.arc(posX, posY, ratio/2, 0, 2*Math.PI);
ctx.fillStyle = this.color;
ctx.fill();
ctx.stroke();
}
};
//获取点击位置
function getMousePos(canvas, evt) {
var rect = canvas.getBoundingClientRect();
return {
x: evt.clientX - rect.left * (canvas.width / rect.width),
y: evt.clientY - rect.top * (canvas.height / rect.height)
}
} function getNode(pos) {
return ((pos / ratio).toFixed()) * ratio;
} var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var lineNums = 15;
var ratio = 40;
var width = (lineNums - 1) * ratio; controller.init(); canvas.addEventListener("click", function (evt) {
var mousePos = getMousePos(canvas, evt);
mousePos.x = getNode(mousePos.x);
mousePos.y = getNode(mousePos.y);
var exist = controller.exist(mousePos.x, mousePos.y);
if (!exist && !controller.over) {
controller.drawPiece(mousePos.x, mousePos.y);
controller.trans();
}
}, false);
</script>
</html>
这算是自己学习Javascript的一个开端，未来的话，可能也要以这个例子为基础，利用学到的知识，进一步增加其它功能，优化代码。