2019-02-28 · A Decorator is a special kind of declaration that can be attached to a class declaration, method, accessor, property, or parameter. Decorators use the form @expression, where expression must evaluate to a function that will be called at runtime with information about the decorated declaration. Decorators are a stage 2 proposal for JavaScript.

. . 我们只需要给装饰器 @Emit 传递一个事件名参数 reset ,这样函数 emitTodo 运行之后就会触发 reset 事件. Finally, make sure to commit your changes to Git before moving on any further.

Jul 16, 2019 A Class decorator is a function that takes the constructor of the class as its only parameter. If the class decorator returns a value, it will replace the 

The @Component decorator we saw earlier is a type of class declaration decorator or simply class decorator as it modifies the class itself. A decorator is a simple JavaScript function and nothing Typescript decorators have a range of use-cases that are primarily aimed at modifying or annotating class implementations. Decorators are a stage 2 Javascript proposal, but are available for us to If a method decorator has no arguments e.g. @aDecorator, then the decorator function should be declared as: function aDecorator(target: any, propertyKey: string, descriptor: PropertyDescriptor){} where: target: Either the constructor function of the class for a static method, or the prototype of the class for an instance method.

+ 22. - 2. projects/common-map/src/fm-map/common-map.module.ts Visa fil components/for-item/for-sourcetask.decorator'; -175,6 +175,7 @@ export class MapComponent implements OnInit, OnDestroy,AfterViewInit {. newMapState  for-item/for-itemtype.decorator';; import {ForChild } from '.