angular - TypeError : instance[output. propName].subscribe 不是函数

Question

我正在尝试从子组件向父组件发出事件。

家长:

parent .ts

onChangeUpload(event){
  console.log('event');
  console.log(event);
}

<app-upload (uploadEmit)="onChangeUpload($event)"></app-upload>

child :

@Output() uploadEmit: EventEmitter = new EventEmitter();

this.uploadEmit.emit('upload successful');

我得到了这个错误:

core.js:1448 ERROR Error: Uncaught (in promise): TypeError: instance[output.propName].subscribe is not a function

@angular/cli: 1.7.3
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.6.2
webpack: 3.11.0

Answer 1

import { EventEmitter } from 'events';

这是您的导入声明吗？

如果是，改成

import { EventEmitter } from '@angular/core';

并禁用 VS Code 自动导入。 :)