js中定义三维数组

// 定义一个3x3x3的三维数组
let threeDArray = [
    [
        [1, 2, 3],
        [4, 5, 6],
        [7, 8, 9]
    ],
    [
        [10, 11, 12],
        [13, 14, 15],
        [16, 17, 18]
    ],
    [
        [19, 20, 21],
        [22, 23, 24],
        [25, 26, 27]
    ]
];

console.log(threeDArray[0][1][2]); // 输出: 6

let depth = 3; // 第一维大小
let rows = 3;  // 第二维大小
let cols = 3;  // 第三维大小

let threeDArray = [];

for (let i = 0; i < depth; i++) {
    threeDArray[i] = []; // 初始化第一维
    for (let j = 0; j < rows; j++) {
        threeDArray[i][j] = []; // 初始化第二维
        for (let k = 0; k < cols; k++) {
            threeDArray[i][j][k] = i + j + k; // 赋值
        }
    }
}

console.log(threeDArray[1][2][1]); // 输出: 4

let depth = 3;
let rows = 3;
let cols = 3;

let threeDArray = Array.from({ length: depth }, (_, i) =>
    Array.from({ length: rows }, (_, j) =>
        Array.from({ length: cols }, (_, k) => i + j + k)
    )
);

console.log(threeDArray[2][0][2]); // 输出: 4

let depth = 3;
let rows = 3;
let cols = 3;
let initialValue = 0;

let threeDArray = Array(depth).fill(null).map(() =>
    Array(rows).fill(null).map(() =>
        Array(cols).fill(initialValue)
    )
);

console.log(threeDArray[0][0][0]); // 输出: 0

let value = threeDArray[1][2][1]; // 获取第二层第三行第二列的值
console.log(value); // 输出对应值

threeDArray[0][1][2] = 10; // 修改第一层第二行第三列的值为10
console.log(threeDArray[0][1][2]); // 输出: 10