Javascript 将数组添加到二维数组
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Add array to two-dimensional array
提问by dmr
Array A is a two dimensional array. It's made up of array X and Y. I'd like to add array Z to Array A as another item in Array A. How do I do this?
数组 A 是一个二维数组。它由数组 X 和 Y 组成。我想将数组 Z 添加到数组 A 作为数组 A 中的另一项。我该怎么做？
Editedto add code:
编辑添加代码：
arrayA = new Array(
[1, 2, 3] //array x
[4, 5, 6] //array y
);
arrayZ = new Array(7, 8, 9);
//now, how do I add arrayZ onto the end of arrayA?
回答by Jonathan M
This will add it to the end of arrayA
这会将它添加到 arrayA 的末尾
arrayA.push(arrayZ);
Here's a reference for push: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/push
这是一个参考push：https: //developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/push
回答by andyb
You could push your arrays onto Array alike so
你可以a像这样将你的数组推到 Array 上
JavaScript
JavaScript
var a = new Array();
var x = new Array();
var y = new Array();
var z = new Array();
a.push(x);
a.push(y);
a.push(z);
Edit:After OP edited question with code example:
编辑：在 OP 用代码示例编辑问题之后：
var z = new Array(7, 8, 9);
var a = new Array(
[1, 2, 3],
[4, 5, 6]
);
a.push(z);
回答by zzzzBov
Ok, lots of responses as to how to add items to arrays, but lets start with making your code better:
好的，有很多关于如何向数组添加项的回答，但让我们从改进代码开始：
arrayA = [ //don't use new Array()
[1, 2, 3],
[4, 5, 6]
];
arrayZ = [7,8,9];
There're a few ways you can do this.
有几种方法可以做到这一点。
You can use the array methods unshiftor push
arrayA.unshift(arrayZ) //adds z to the front of arrayA
arrayA.push(arrayZ) //adds z to the end of arrayA
You can also set the location explicitly:
您还可以明确设置位置：
arrayA[0] = arrayZ //overwrites the first element
arrayA[1] = arrayZ //overwrites the second element
arrayA[2] = arrayZ //adds a new element at 2
arrayA[arrayA.length] = arrayZ //essentially the same as using push
You can also splicethe new element into the array:
您还可以将新元素拼接到数组中：
arrayA.splice(1, 0, arrayZ)
1specifies the start index of the elements being inserted/removed .0specifies how many elements should be removed, in this case we're adding and not removing any. arrayZis the element to insert
1指定被插入/删除的元素的起始索引。0指定应该删除多少个元素，在这种情况下，我们添加而不是删除任何元素。arrayZ是要插入的元素
回答by parapura rajkumar
Without any code I am just assuming
没有任何代码我只是假设
arr[0] = is array X
arr[0] = 是数组 X
arr[1] = is array Y
arr[1] = 是数组 Y
so you can use arr[2] for Y
所以你可以使用 arr[2] 作为 Y
var foo = new Array()
foo[0] = new Array() // Your x
foo[1] = new Array() // Your y
foo[2] = new Array() // Your z
回答by Abhishek Soni
On ES6you can use the spread operator (...) as follows:
在ES6 上，您可以...按如下方式使用扩展运算符 ( )：
arrayA = [
[1, 2, 3],
[4, 5, 6]
];
arrayB = [7,8,9];
arrayA = [...arrayA, ...[arrayB]];
