Question

我无法弄清楚 JavaScript 代码在数组中交换两个值（本例中为数字）时的工作原理。

该函数（称为move）将您单击的值的位置与“”的位置交换。数组值显示在页面上，当您单击任何数字（通过onclick）时，函数将启动。

boxArray = ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15",""]

function move() {

}

Answer 1

要交换两个值，请使用一些逻辑，将一个值存储在临时变量中，将第一个值设置为第二个，将第二个值设置为临时变量：

function swap(array, index1, index2) {
    var temp = array[index1];

    array[index1] = array[index2];
    array[index2] = temp;
}

真的很容易

FIDDLE

Answer 2

也许这（这里是jsfiddle）：

<button>1</button><button>2</button>

$('button').click(function() {
    var val = $(this).html();

    swap(val);
});

var boxArray = ["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15",""]

function swap(el) {
    var blankIndex = boxArray.indexOf(""),
        elIndex = boxArray.indexOf(el);

    boxArray[blankIndex] = el;
    boxArray[elIndex] = "";

    console.log(boxArray);
}

Answer 3

我无法确切地说出你想要做什么，但我相信我得到了它的要点。 array.splice是您可能正在寻找的功能：

function move(arr, from, to) {
    if (from >= arr.length || to >= arr.length) return;
    var y = arr.splice(from, 1)[0];
    arr.splice(to, 0, y);
}

var x = [1,2,3];
move(x, 0, 2); // moves the value at position 0 to position 2: [2,3,1]

交换数组中的两个值

3 个答案: