Question

在此函数中，在第一个for循环之后，代码未到达。 alert("can't get here");无效。{1}}我在这里错过了一些明显的JavaScript警告吗？其余代码可以在这里找到：http://jsbin.com/tiweniludoqe/7/edit 非常感谢任何帮助。

function checkForWin(){

    var winCondition = 0;

    //check for horizontal wins
    for(i = 0; i < board[i].length; i++) {
        for(j = 0; j < board[i].length; j++) {
            winCondition += board[i][j];
            if(winCondition === board[i].length) {
                alert("win detected horizontal");
            }
        }
        winCondition = 0;
    }
    alert("can't get here");

    //check for vertical wins
    for(i = 0; i < board[i].length; i++) {
        for(j = 0; j < board[i].length; j++) {
            winCondition += board[j][i];
            alert("winCondition: " + winCondition);
            if(winCondition === board[i].length) {
                alert("win detected horizontal");
            }
        }
    }

    //if diagonal / is 3 or -3 win
    //if diagonal \ is 3 or -3 win
}

Answer 1

我认为你的代码通过在第一个 for 循环中检查board [i] .length而陷入无限循环。

试试这个：

function checkForWin(){

    var winCondition = 0;

    //check for horizontal wins
    for(i = 0; i < board.length; i++) { //HERE WE CHECK FOR board.length INSTEAD OF board[i].length
        for(j = 0; j < board[i].length; j++) {
            winCondition += board[i][j];
            if(winCondition === board[i].length) {
                alert("win detected horizontal");
            }
        }
        winCondition = 0;
    }
    alert("can't get here");

    //check for vertical wins
    for(i = 0; i < board.length; i++) { //HERE YOU HAD THE SAME PROBLEM
        for(j = 0; j < board[i].length; j++) {
            winCondition += board[j][i];
            alert("winCondition: " + winCondition);
            if(winCondition === board[i].length) {
                alert("win detected horizontal");
            }
        }
    }

    //if diagonal / is 3 or -3 win
    //if diagonal \ is 3 or -3 win
}

最终推荐...当使用迭代循环时，尝试使用 var 来获取迭代变量，如下所示：

for(var i=0; i < board.length; i++)

而不是：

for(i=0; i < board.length; i++)

通过这样做，您可以避免使用这些变量填充全局范围（在 i 上面的情况下）。

for循环后没有达到代码（javascript）

1 个答案: