如何在javascript中创建指向对象属性的指针? [英] How do you create a pointer to an object property in javascript?

问题描述

如果我有这样的对象:

obj = {a:{aa:1}, b:2};

我想创建一个快捷方式变量(指向obj.a.aa的指针)，如下所示:

and I want to create a shortcut variable (pointer to obj.a.aa) x like this:

x = obj.a.aa;

然后我想像这样使用x将值3分配给obj.a.aa:

and then I want to assign the value 3 to obj.a.aa using x like this:

x = 3;  // I would like for obj.a.aa to now equal 3
console.log(obj.a.aa); // 1  (I want 3)

如何设置x以使值3进入obj.a.aa?

How can I set x up to result in the value 3 going into obj.a.aa?

我了解obj.a.aa是原始类型，但是如何定义指向它的变量，然后可以使用该变量为属性分配值?

I understand that obj.a.aa is a primitive, but how can I define a variable that points to it which I can then use to assign a value to the property?

推荐答案

您不能使用x = value，因为它不会保留任何引用，而只是保留副本.为此，您必须引用父分支:

You cannot use x = value as that will not keep any references, just a copy. You would have to reference the parent branch in order to do so:

x = obj.a;

然后设置值:

x.aa = 3;

这篇关于如何在javascript中创建指向对象属性的指针?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！