javascript 为什么 Array.push.apply 不起作用？
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Why doesn't Array.push.apply work?
提问by starwed
As described here, a quick way to append array b to array a in javascript is a.push.apply(a, b).
如所描述的在这里，一个快速的方法来追加数组b到阵列的在JavaScript是a.push.apply(a, b)。
You'll note that the object a is used twice. Really we just want the pushfunction, and b.push.apply(a, b)accomplishes exactly the same thing -- the first argument of apply supplies the thisfor the applied function.
您会注意到对象 a 被使用了两次。实际上我们只想要这个push函数，并b.push.apply(a, b)完成完全相同的事情——apply 的第一个参数this为应用函数提供了。
I thought it might make more sense to directly use the methods of the Array object: Array.push.apply(a, b). But this doesn't work!
我想这可能更有意义，直接使用数组对象的方法：Array.push.apply(a, b)。但这不起作用！
I'm curious why not, and if there's a better way to accomplish my goal. (Applying the pushfunction without needing to invoke a specific array twice.)
我很好奇为什么不这样做，以及是否有更好的方法来实现我的目标。（应用该push函数而无需两次调用特定数组。）
回答by Ven
It's Array.prototype.push, not Array.push
是Array.prototype.push，不是Array.push
回答by erdem
You can also use [].push.apply(a, b)for shorter notation.
您也可以使用[].push.apply(a, b)更短的符号。
回答by David Griffin
The current version of JS allows you to unpack an array into the arguments.
当前版本的 JS 允许您将数组解包到参数中。
var a = [1, 2, 3, 4, 5,];
var b = [6, 7, 8, 9];
a.push(...b); //[1, 2, 3, 4, 5, 6, 7, 8, 9];
回答by phenomnomnominal
What is wrong with Array.prototype.concat?
有什么问题Array.prototype.concat？
var a = [1, 2, 3, 4, 5];
var b = [6, 7, 8, 9];
a = a.concat(b); // [1, 2, 3, 4, 5, 6, 7, 8, 9];
