smsb-web-develop/src/layout/components/Navbar/UploadDashboard/install.js

import Vue from 'vue'
import Main from './main.vue'

const UploadDashboardConstructor = Vue.extend(Main)

export default {
  install (Vue) {
    Vue.prototype.$showUpload = showUpload
    Vue.prototype.$closeUpload = closeUpload
  }
}

let instance

export function showUpload () {
  if (!instance) {
    instance = new UploadDashboardConstructor()
    instance.$mount()
    document.body.appendChild(instance.$el)
  }
  return instance
}

export function closeUpload () {
  if (instance) {
    instance.$destroy()
    document.body.removeChild(instance.$el)
    instance = null
  }
}