在Javascript中的数组内添加数组

Question

How do I push array into a new Array. For example

var arr = ['one','two','three'];
var newArr = [];

Now I want newArr[0] = ['one','two','three']

I have tried using push function but it pushes all the elements of arr into newArr . I want to push the entire arr as it is in newArr

Answer 1

var arr = ['one','two','three'];
var newArr = [];
newArr.push(arr); //<-- add entire original array as first key of new array

Answer 2

Others have answered, so I guess your question is not really clear.

As you put your question, first and only element of newArray should be the arr array, then you use

newArr.push(arr);

as Mitya and Tiij7 said.

However, maybe you meant you want to join (concat) 2 arrays in a new array? Then you would use:

var arr3 = [].concat(arr, newArr);

or

var arr3 = [...arr, ...newArr];

Or you just wanted to clone the initial array? Then use

var newArr = [...arr];

Answer 3

You can write:

newArr[0] = ['one','two','three'];

And this will work. Or use variable:

 newArr[0] = arr;

Also, array methods push or unshift will the same way in your situation work:

newArr.push(arr);