javascript - 在JavaScript中使用“反射”创建“类”的实例(Create instance of “Class” Using “Reflection” in JavaScript)

Question

I searched the web for some way to create instance of "Class" in "reflection" using javaScript but I found nothing.(我在网上搜索了一些使用javaScript在“反射”中创建“类”实例的方法，但没有发现任何结果。)

generally i'm trying to do someting like java code.(通常我想做一些类似Java代码的事情。)

Object o = Class.forename("MyClassName");

but in javaScript, in such way that I'll get the instance of class when I have only the name of the class, any idea?(但是在javaScript中，以这样的方式，当我只有类的名称时，我将获得类的实例，知道吗？)

Thankes.(谢谢)

  ask by Asaf Maimon translate from so

Answer 1

JavaScript doesn't have classes.(JavaScript没有类。)

But if by "class" you mean you have a constructor function:(但是，如果使用“类”，则表示您具有构造函数：)

function MyClassName() {
   // do constructor things here
}

But the name of that function is in a variable:(但是该函数的名称在变量中：)

var someclass = "MyClassName";

Then you can instantiate an instance like this:(然后，您可以像这样实例化一个实例：)

var obj = new window[someclass]();

The above only works if MyClassName is in the global scope.(仅当MyClassName在全局范围内时，以上方法才有效。)