Class EventEmitter`Abstract`

事件监听对象。

Description

用于为对象增加或取消事件监听。

Hierarchy

EventEmitter

Index

Constructors

Methods

emit off on once

Constructors

constructor

new EventEmitter(): EventEmitter
Returns EventEmitter

Methods

emit

emit(type: string, arg?: any): EventEmitter
触发事件
Parameters
- type: string
  
  事件类型
- Optional arg: any
Returns EventEmitter

off

off(type: string, handler: ((arg?: any) => void)): EventEmitter
取消监听
Parameters
- type: string
- handler: ((arg?: any) => void)
  - - (arg?: any): void
    - Parameters
      
      Optional arg: any
      
      Returns void
Returns EventEmitter

on

on(type: string, handler: ((arg?: any) => void)): EventEmitter
添加监听
Parameters
- type: string
  
  Event type
- handler: ((arg?: any) => void)
  
  A callback function to process the incomming event
  - - (arg?: any): void
    - Parameters
      
      Optional arg: any
      
      Returns void
Returns EventEmitter

once

once(type: string, handler: ((arg?: any) => void)): EventEmitter
添加一次性监听
Parameters
- type: string
  
  Event type
- handler: ((arg?: any) => void)
  
  A callback function to process the incomming event
  - - (arg?: any): void
    - Parameters
      
      Optional arg: any
      
      Returns void
Returns EventEmitter