组件调用父页面事件一直this.triggerEvent is not a function

[nyrf]

问题描述
组件调用父页面事件一直this.triggerEvent is not a function，

复现步骤
[复现问题的步骤]

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

// src/pages/index/demoPage.js
import Taro, { Component } from '@tarojs/taro'
import { View } from '@tarojs/components'
import Demo from '../../components/demo/demo'
import './index.scss'

export default class DemoPage extends Component {
  state = {}
  config = {
    navigationBarTitleText: '首页'
  }
  closeBtn() {
    console.log('main close')
  }

  render() {
    return (
      <View className='index'>
        <Demo onCloseBtn={this.closeBtn} />
      </View>
    )
  }
}

// src/components/demo/demo.js
import Taro, { Component } from '@tarojs/taro'
import { View } from '@tarojs/components'

export default class Demo extends Component {
  closeEvent() {
    console.log('close')
    this.triggerEvent('closeBtn')
  }
  render() {
    return <View onClick={this.closeEvent.bind(this)}>DEMO</View>
  }
}
// ```

报错信息

系统信息
👽 Taro v1.3.11

Taro CLI 1.3.11 environment info:
System:
OS: macOS 10.14.4
Shell: 3.0.2 - /usr/local/bin/fish
Binaries:
Node: 12.6.0 - ~/.config/nvm/12.6.0/bin/node
Yarn: 1.12.1 - /usr/local/bin/yarn
npm: 6.9.0 - ~/.config/nvm/12.6.0/bin/npm

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