[英]Is it possible to access class properties without initialising the class?
I want to access all of the properties of a class that will be defined when the constructor is called, so that I can implement a sort of interface for the class. 我想访问将在调用构造函数时定义的类的所有属性,以便可以为该类实现某种接口。
Say I had a class that defines the property hello
, I would like to access it to check it has been implemented and the type assigned to it is correct. 说我有一个定义属性
hello
的类,我想访问它以检查它是否已实现并且分配给它的类型正确。 Problem is, since all non- static
class properties are tied to an instance, I can't get at them without instantiating the class, which I can't do. 问题是,由于所有非
static
类属性都绑定到实例,因此如果不实例化该类,我将无法获取它们,而这是无法做到的。
In this situation, is it possible to access hello
? 在这种情况下,可以访问
hello
吗?
class MyClass {
constructor () {
this.hello = 'greetings';
}
}
In this situation, is it possible to access
hello
?在这种情况下,可以访问
hello
吗?
Not without using a JavaScript parser (like IDEs do to try to infer instance mbmers). 并非没有使用JavaScript解析器(就像IDE会尝试推断实例mbmers一样)。
hello
, as you say, doesn't exist as a property until/unless an instance is created. 就像您说的,
hello
直到/除非创建了一个实例才作为属性存在。 With a parser, you can (usually) determine what the property names will be, perhaps sometimes their initial values, but that's all. 使用解析器,您可以(通常)确定属性名称是什么,也许有时是它们的初始值,仅此而已。
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