JavaScript有内存堆吗？ [英] Does JavaScript have a memory heap?

问题描述

换句话说，我有什么选择在JavaScript中分配内存？

In other words, what options do I have to allocate memory in JavaScript?

我知道你可以全局或在函数范围内分配内存。我可以动态分配内存吗？ new 运算符的真正含义是什么？

I know you can allocate memory either globally, or inside function scope. Can I allocate memory dynamically? What does the new operator really mean?

编辑：这是一个具体示例。你将如何实现从用户读取整数值 - n ，然后将 n 整数读入数组？

here's a specific example. How would you implement reading an integer value from the user - n, and then read n integers into an array?

推荐答案

你无法分配内存。你可以创建对象。这就是 new 的作用。

you can't allocate memory. you can create objects. that's what new does.

现在，javascript是一个奇怪的生物：函数也是javascript中的对象。所以这意味着你可以使用 new 来实例化所有东西。

now, javascript is a queer creature: functions are also objects in javascript. So this mean that you can instantiate prettymuch everything using new.

所以， new 运算符表示正在创建新对象。

So, the new operator means that a new object is being created.

Javascript也可以垃圾收集这些变量，就像在java中一样。因此，如果你了解java，你应该很容易画出相似之处。

Javascript also garbage-collects these variables, just like it happens in java. So if you know java, it should be easy for you to draw parallels.

欢呼，

jrh

PS：当你分配对象时，你真的在​​分配内存。只是，你没有明确地这样做。您可以分配一个数组，并使其行为类似于内存缓冲区，但这会大大降低javascript的性能：javascript数组不是内存缓冲区，它们也是对象（就像其他所有内容一样）。

PS: when you allocate objects, you really are allocating memory. Only, you are not doing that explicitly. You can allocate an array, and make it behave like a memory buffer, but that will degrade javascript performance drastically: javascript arrays are not in-memory buffers, they are also objects (like everything else).

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