使用javascript检测可逆板上的空位置

Question

我正在开发一款Reversi（奥赛罗）游戏，我面临着一个场景，我要检测棋盘上的空位。我写的，但不准确。

var IsUserTurn = true;
var Empty;
function InsertBlack(x, y) {
    var Temp1 = document.createElement("img");
    Temp1.setAttribute("src", "http://www.uploadhosting.co/uploads/151.238.149.6/Black.png");
    Temp1.style.position = "absolute";
    var Temp3 = (x * 50) - 50;
    var Temp4 = (y * 50) - 50;
    Temp1.style.left = Temp3 + "px";
    Temp1.style.top = Temp4 + "px";
    var Temp2 = document.getElementById("panel");
    Temp2.style.position = "relative";
    Temp2.appendChild(Temp1);
}
function InsertWhite(x, y) {
    var Temp1 = document.createElement("img");
    Temp1.setAttribute("src", "http://www.uploadhosting.co/uploads/151.238.149.6/White.png");
    Temp1.style.position = "absolute";
    var Temp3 = (x * 50) - 50;
    var Temp4 = (y * 50) - 50;
    Temp1.style.left = Temp3 + "px";
    Temp1.style.top = Temp4 + "px";
    var Temp2 = document.getElementById("panel");
    Temp2.style.position = "relative";
    Temp2.appendChild(Temp1);
}
function SetClickEventListenerForPanel() {
    var Temp1 = document.getElementById("panel");
    if (Temp1.addEventListener) {
        Temp1.addEventListener("click", PanelClickProcessor);
    } else if (Temp1.attachEvent) {
        Temp1.attachEvent("onclick", PanelClickProcessor);
    }
}
function SetBooleanVariableStatus() {
    if (IsUserTurn === true) {
        document.getElementById("Boolean").innerHTML = "User's turn";
    } else {
        document.getElementById("Boolean").innerHTML = "Computer's turn";
    }
}

function IsEmpty(x, y) {
    var Temp1 = document.getElementsByTagName("img");
    var i;
    var xx, yy;
    xx = (x * 50) - 50 + ("px");
    yy = (y * 50) - 50 + ("px");
    for (i = 0; i < Temp1.length; i++) {
        if (Temp1[i].style.left != xx && Temp1[i].style.top != yy) {
            Empty = true;
        } else {
            Empty = false;
            break;
        }

    }
    return Empty;
}
function Convert(data) {
    if (data <= 50) {
        return 1;
    }
    if (data <= 100) {
        return 2;
    }
    if (data <= 150) {
        return 3;
    }
    if (data <= 200) {
        return 4;
    }
    if (data <= 250) {
        return 5;
    }
    if (data <= 300) {
        return 6;
    }
    if (data <= 350) {
        return 7;
    }
    if (data <= 400) {
        return 8;
    }
}
function PanelClickProcessor(e) {
    var X = e.pageX - this.offsetLeft;
    var Y = e.pageY - this.offsetTop;
    var xtocall, ytocall;
    xtocall = Convert(X);
    ytocall = Convert(Y);

    alert(IsEmpty(xtocall, ytocall));
}
InsertBlack(4, 4);
InsertWhite(5, 4);
InsertWhite(4, 5);
InsertBlack(5, 5);
SetClickEventListenerForPanel();
SetBooleanVariableStatus();

演示：http://jsfiddle.net/huL3qoa3

当你点击板上的任何位置时，如果位置是否为空，都会显示一条警告。它工作不好，出了什么问题？

Answer 1

在比较坐标时，应使用||运算符而不是&&运算符：

if (Temp1[i].style.left != xx || Temp1[i].style.top != yy) {