Using static methods of Class class in ES6

This time I will bring you the static method of using the Class class in ES6. What are the precautions for using the static method of the Class class in ES6? The following is a practical case, let's take a look.

I have seen es6 stuff before but forgot about it, so I will summarize it again:

A class is equivalent to the prototype of an instance. All methods defined in the class will be inherited by the instance. If you add the static keyword before a method, it means that the method will not be inherited by the instance, but will be called directly through the class. This is called a "static method"

class Foo {
  static classMethod() {
    return 'hello';
  }
}
Foo.classMethod() // 'hello'
var foo = new Foo();
foo.classMethod()
// TypeError: foo.classMethod is not a function

static keyword , indicating that the method is a static method and can be called directly on class Foo (Foo.classMethod()). Instead of calling it on an instance of class Foo. If a static method is called on an instance, an error is thrown indicating that the method does not exist.

class Foo {
  static classMethod() {
    return 'hello';
  }
}
class Bar extends Foo {
}
Bar.classMethod(); // 'hello'

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