Suppose you have two arrays:

假设您有两个数组：

const first = ['one', 'two']const second = ['three', 'four']

and you want to merge them into one single array

您想将它们合并为一个数组

How can you do so?

你该怎么做？

The modern way is to use the destructuring operator, to create a brand new array:

现代方法是使用解构运算符来创建全新的数组：

const result = [...first, ...second]

This is what I recommend. Note that this operator was introduced in ES6, so older browsers (read: Internet Explorer) might not support it.

这就是我的建议。 请注意，此运算符是ES6中引入的，因此较旧的浏览器(阅读：Internet Explorer)可能不支持它。

If you want a solution that works also with older browsers, you could use the concat() method which can be called on any array:

如果您想要一个适用于较旧浏览器的解决方案，则可以使用concat()方法，该方法可以在任何数组上调用：

const result = first.concat(second)

Both methods will generate a new array, without modifying the existing ones.

两种方法都将生成一个新数组，而不修改现有数组。

翻译自: