為什么不管我在哪點，白棋統統都只在棋盤頂上顯示，而且有時候走兩步白棋才走一步，是代碼有問題嗎？

var?chessBoard?=?[];
var?me?=?true;
var?over?=false;


//贏法數組
var?wins?=?[];

//贏法統計數組
var?myWin?=?[];
var?computerWin?=?[];

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<15;i++)?{
	wins[i]?=?[];
	for?(var?j=0;j<15;j++)?{
		wins[i][j]?=?[];
	}
}

var?count?=?0;
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++;
	}
}

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++;
	}
}

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++;
	}
}

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;
}

var?chess?=document.getElementById('chess');
var?context?=?chess.getContext('2d');

context.strokeStyle="#BFBFBF";

var?logo?=?new?Image();
logo.src="img/logo.png";
logo.onload?=?function(){
	context.drawImage(logo,?0,?0,?450,?450);
	drawChessBard();
}

var?drawChessBard?=?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();
	}	
}

var?onestep?=?function(i,j,me){
	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,"#D1D1D1");
		gradient.addColorStop(1,"#F9F9F9");
	}
	
	context.fillStyle?=?gradient;
	context.fill();
}

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(chessBoard[i][j]?==?0){
		onestep(i,j,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)?{
					window.alert("你贏了");
					over?=?true;
				}
			}
		}
		if?(!over)?{
			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?(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);
	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)?{
					window.alert("計算機贏了");
					over?=?true;
				}
			}
		}
		if?(!over)?{
			me?=?!me;	
		}
}

而且有時候一點還會點出白子來，有沒有大神幫忙解決一下