注解和装饰器有什么区别?

问题描述

我对何时使用术语注释和何时使用装饰器感到困惑?

I am confused when to use term annotation and when to use decorator ?

 @Component({
      selector: 'tabs',
      template: `
      `
    })
    export class Tabs {

    }

推荐答案

装饰器对应于在类上调用的函数，而注释是使用反射元数据库"在类上设置的唯一"元数据.

A decorator corresponds to a function that is called on the class whereas annotations are "only" metadata set on the class using the Reflect Metadata library.

对于TypeScript和ES7，@Something是装饰器.在Angular2的上下文中，装饰器@Component，@Injectable，...使用Reflect.defineMetadata方法定义装饰元素的元数据.

With TypeScript and ES7, @Something is a decorator. In the context of Angular2, decorators like @Component, @Injectable, ... define metadata for the decorated element using the Reflect.defineMetadata method.

这个问题可能会让您感兴趣，以了解装饰器实际上是什么:

This question could interest you to find out what a decorator actually is:

• 如何在Typescript中编译装饰器(注释)?

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