有没有办法在事件监听器方法中访问类上下文并有可能删除监听器？示例1:import{EventEmitter}from"events";exportdefaultclassEventsExample1{privateemitter:EventEmitter;constructor(privatetext:string){this.emitter=newEventEmitter();this.emitter.addListener("test",this.handleTestEvent);this.emitter.emit("test");}publicdispose(){this.emi