javascript 创建具有特定长度和宽度的二维数组
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Creating a 2D array with specific length and width
提问by lawx
*see the title. I basically need it to create a blank array that can be any dimension like 40x60. Basically maybe something like makeArray(3, 4)makes an array like:
*见标题。我基本上需要它来创建一个空白数组，该数组可以是任何尺寸，例如 40x60。基本上可能类似于这样makeArray(3, 4)的数组：
[][][]
[][][]
[][][]
[][][]
回答by Kyle
Javascript arrays are dynamic in size. However, if you wish to create an array of a specific size, the Arrayconstructor takes an optional length argument:
Javascript 数组的大小是动态的。然而，如果你想创建一个特定大小的数组，Array构造函数需要一个可选的长度参数：
function makeArray(d1, d2) {
var arr = new Array(d1), i, l;
for(i = 0, l = d2; i < l; i++) {
arr[i] = new Array(d1);
}
return arr;
}
Slightly shorter:
稍微短一点：
function makeArray(d1, d2) {
var arr = [];
for(let i = 0; i < d2; i++) {
arr.push(new Array(d1));
}
return arr;
}
UPDATE
更新
function makeArray(w, h, val) {
var arr = [];
for(let i = 0; i < h; i++) {
arr[i] = [];
for(let j = 0; j < w; j++) {
arr[i][j] = val;
}
}
return arr;
}
回答by Moritz Roessler
Well make Array would be a simple function like this
那么 make Array 将是一个像这样的简单函数
?function makeArray(a,b) {
var arr = new Array(a)
for(var i = 0;i<a;i++)
arr[i] = new Array(b)
return arr
}
console.log(makeArray(4,4))
? But you don't have to define Arrays with functions you can simply do something like
? 但是你不必用函数定义数组，你可以简单地做一些类似的事情
var arr=[]
arr[10] = 10
Which would result in a Array with 10 Elements, 0 - 9 are undefined
这将导致具有 10 个元素的数组，0 - 9 是 undefined
But thats enough of an Answer in this case, i tried to point some things out in this question regarding Arrays, if you're interested you can take a look at this question
但在这种情况下，这已经足够了，我试图在这个问题中指出一些关于数组的事情，如果你有兴趣，你可以看看这个问题
