typescript接口中的这​​种语法是什么意思？

Question

最近我想在我的angular 4应用程序中实现观察者模式，我在打字稿中遇到了这种代码语法，我不知道这意味着什么？

代码：

module Patterns.Interfaces {

    export interface IObservable {
        RegisterObserver(Observer: Patterns.Interfaces.IObserver);//Patterns.Interfaces.IObserver type?
        RemoveObserver(Observer: Patterns.Interfaces.IObserver);
        NotifyObservers();
    }
}

感谢您的帮助。

Answer 1

这是一个带注释的版本：

// There's a namespace named Patterns.Interfaces
module Patterns.Interfaces {
    // It has an interface named IObservable
    // It is visible outside this block ('export')
    export interface IObservable {
        // An IObservable has a function called RegisterObserver.
        // It takes one argument named 'Observer'.
        // 'Observer' is of type Pattern.Interfaces.IObserver.
        // You must pass this argument.
        // Its return type is unspecified, so is assumed to be 'any'
        RegisterObserver(Observer: Patterns.Interfaces.IObserver);//Patterns.Interfaces.IObserver type?
        // Same as above
        RemoveObserver(Observer: Patterns.Interfaces.IObserver);
        // An IObservable has a function called NotifyObservers.
        // It is called with no arguments.
        // Its return type is unspecified, so is assumed to be 'any'
        NotifyObservers();
    }
}