本文翻译自：Copy array items into another array
I have a JavaScript array dataArray which I want to push into a new array newArray . 我有一个JavaScript数组dataArray ，我想将其推入一个新的数组newArray 。 Except I don't want newArray[0] to be dataArray . 除了我不希望newArray[0]成为dataArray 。 I want to push in all the items into the new array: 我想将所有项目推入新数组：
var newArray = [];
newArray.pushValues(dataArray1);
newArray.pushValues(dataArray2);
// ...
or even better: 甚至更好：
var newArray = new Array (
dataArray1.values(),
dataArray2.values(),
// ... where values() (or something equivalent) would push the individual values into the array, rather than the array itself
);
So now the new array contains all the values of the individual data arrays. 所以现在新数组包含各个数据数组的所有值。 Is there some shorthand like pushValues available so I don't have to iterate over each individual dataArray , adding the items one by one? 有没有类似pushValues简写，所以我不必迭代每个dataArray ，逐个添加项目？
#1楼
参考：https://stackoom.com/question/HRBt/将数组项复制到另一个数组中
#2楼
instead of push() function use concat function for IE. 而不是push（）函数使用IE的concat函数。 example, 例，
var a=a.concat(a,new Array('amin'));
#3楼
Тhis is a working code and it works fine: 这是一个工作代码，它工作正常：
var els = document.getElementsByTagName('input'), i;
var invnum = new Array();
var k = els.length;
for(i = 0; i < k; i++){invnum.push(new Array(els[i].id,els[i].value))}
#4楼
I will add one more "future-proof" reply 我将再添加一个“面向未来”的回复
In ECMAScript 6, you can use the Spread syntax : 在ECMAScript 6中，您可以使用Spread语法 ：
let arr1 = [0, 1, 2]; let arr2 = [3, 4, 5]; arr1.push(...arr2); console.log(arr1)
Spread syntax is not yet included in all major browsers. 扩展语法尚未包含在所有主流浏览器中。 For the current compatibility, see this (continuously updated) compatibility table . 有关当前兼容性，请参阅此（不断更新的） 兼容性表 。
You can, however, use spread syntax with Babel.js . 但是，您可以使用Babel.js的扩展语法。
edit: 编辑：
See Jack Giffin's reply below for more comments on performance. 有关性能的更多评论，请参阅下面的Jack Giffin的回复。 It seems concat is still better and faster than spread operator. 似乎concat仍然比spread运算符更好更快。
#5楼
Found an elegant way from MDN 从MDN找到一种优雅的方式
var vegetables = ['parsnip', 'potato'];
var moreVegs = ['celery', 'beetroot'];
// Merge the second array into the first one
// Equivalent to vegetables.push('celery', 'beetroot');
Array.prototype.push.apply(vegetables, moreVegs);
console.log(vegetables); // ['parsnip', 'potato', 'celery', 'beetroot']
Or you can use the spread operator feature of ES6: 或者您可以使用ES6的spread operator功能：
let fruits = [ 'apple', 'banana'];
const moreFruits = [ 'orange', 'plum' ];
fruits.push(...moreFruits); // ["apple", "banana", "orange", "plum"]
#6楼
The following seems simplest to me: 以下对我来说似乎最简单：
var newArray = dataArray1.slice();
newArray.push.apply(newArray, dataArray2);
As "push" takes a variable number of arguments, you can use the apply method of the push function to push all of the elements of another array. 由于“push”采用可变数量的参数，因此可以使用push函数的apply方法来推送另一个数组的所有元素。 It constructs a call to push using its first argument ("newArray" here) as "this" and the elements of the array as the remaining arguments. 它使用其第一个参数（此处为“newArray”）构造一个调用push作为“this”，并将数组元素作为其余参数。
The slice in the first statement gets a copy of the first array, so you don't modify it. 第一个语句中的slice获取第一个数组的副本，因此不要修改它。
Update If you are using a version of javascript with slice available, you can simplify the push expression to: 更新如果您使用的是带有切片的javascript版本，则可以push表达式简化为：
newArray.push(...dataArray2)
