Question

我试图将AI编码为井字游戏完整代码在这里：http://jsbin.com/tiweniludoqe/10/edit?js,console,output
我试图用＆＃34;分数＆＃34;来保持数组。 AI可以在线上进行的可能移动：
moveScoreArray[initialMoveNum] += scoreStack.pop();
但是控制台说moveScoreArray[initialMoveNum]未定义。这是一个逻辑错误还是JavaScript不允许将分数传递给数组，就像我在这里做的那样。

function minimax(inputBoard, player, availableMoves, steps) {
    var copyBoard = inputBoard.clone();

    if(availableMoves === 0) {
        console.log("tie");
        scoreStack.push(0);
    } else if(player < 0) {
        for(var i = 0; i < board.length; i++) {
            for(var j = 0; j < board.length; j++) {
                if(copyBoard[i][j] !== 0) {
                    j++;
                } else {
                    copyBoard[i][j] = -1;
                    if (checkForWin(copyBoard) < 0) {
                        scoreStack.push(-10);
                        //free up board for next for-loop iteration.
                        copyBoard[i][j] = 0;
                    } else {
                        minimax(copyBoard, 1, availableMoves - 1, steps++);
                        //free up the board for next for-loop iteration.
                        copyBoard[i][j] = 0;
                    }
                }
            }
        }
        //after finding all outcomes check if we're back to the initial step
        //if this is one of the AI's initial moves then add it's score to an Array of scores.
        if(availableMoves - steps === 1) {
            var initialMoveNum = moveScoreArray.length;
            while(scoreStack.length !== 0) {
                moveScoreArray[initialMoveNum] += scoreStack.pop();
                //console.log(scoreStack[scoreStack.length - 1]);
            }
                console.log("moveScoreArray value of initial move x: " + moveScoreArray[initialMoveNum]);
        }
    } else if(player > 0) {
        for(var i = 0; i < board.length; i++) {
            for(var j = 0; j < board.length; j++) {
                if(copyBoard[i][j] !== 0) {
                    j++;
                } else {
                    copyBoard[i][j] = 1;
                    if (checkForWin(copyBoard) > 0) {
                        scoreStack.push(10);
                        copyBoard[i][j] = 0;
                    } else {
                        minimax(copyBoard, -1, availableMoves - 1, steps++);
                        copyBoard[i][j] = 0;
                    }
                }
            }
        }
    }
}

全局变量：

//keep track of the number of moves made
var moveNumber = 0;
//create a game board
var board = [];
//populate the board with arrays filled with zeroes
var board = [rOne = initArray(3, 0),
             rTwo = initArray(3, 0),
             rThree = initArray(3, 0)];
//number of total available moves
var totalMoves = board.length * board.length;

//fill an array with zeroes
function initArray(length, value) {
    var arr = [], i = 0;
    arr.length = length;
    for(i; i < length; i++) {
      arr[i] = value;
    }
    return arr;
}
//an array used as a stack to hold scores for moves
var scoreStack = [];
//an array to keep scores for each initial move the AI can make
var moveScoreArray = [];

Answer 1

如果

var ar = [1,2,3]
ar[ar.length] += 3;

永远无法运作

var initialMoveNum = moveScoreArray.length;
moveScoreArray[initialMoveNum] += scoreStack.pop();

永远不会奏效。

Answer 2

未初始化的数组包含未定义的值。因此，向其添加数字会导致NaN。例如：

var ar = [];
var ar[ar.length] += "someText";
console.log(ar[0]);

导致输出“undefinedsomeText”

var ar = [];
var ar[ar.length] += 33;
console.log(ar[0]);

导致NaN

逻辑或JavaScript错误？数组[x]在推送值后未定义

2 个答案: