york-demo-ui/packages/Alert/index.js

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import Alert from './Alert.vue'

export  default  {
  install (Vue) {
    let alertConstrutor =  Vue.extend(Alert)
    let instance
    Alert.getInstance = () => {
      instance = instance || new alertConstrutor()
      let el = instance.$mount().$el
      document.body.appendChild(el)
      return {
        add (notification) {
          instance.add(notification)
        },
        remove (name) {
          instance.remove(name)
        }
      }
    }
    Vue.prototype.$alert = (props = {}) => {
      Alert.getInstance()
      instance.add(props)
    }
  }
}