text: import Vue from 'vue'
  // 导入组件
  import SaveShareFileDialog from './Dialog.vue'
  // 使用基础 Vue 构造器，创建一个“子类”
  const SaveShareFileConstructor = Vue.extend(SaveShareFileDialog)
  
  let saveShareFileInstance = null
  /**
   * 初始化保存分享文件实例
   * @param {array} fileInfo 要保存的文件数组
   */
  const initInstanceSaveShareFile = (fileInfo) => {
  	saveShareFileInstance = new SaveShareFileConstructor({
  		el: document.createElement('div'),
  		data() {
  			return {
  				fileInfo
  			}
  		}
  	})
  }
  /**
   * 保存分享文件 Promise 函数
   * @returns {Promise} 抛出确认和取消回调函数
   */
  const showSaveShareFileDialog = (obj) => {
  	// 非首次调用服务时，在 DOM 中移除上个实例
  	if (saveShareFileInstance !== null) {
  		document.body.removeChild(saveShareFileInstance.$el)
  	}
  	let { fileInfo } = obj
  	return new Promise((reslove) => {
  		initInstanceSaveShareFile(fileInfo)
  		saveShareFileInstance.callback = (res) => {
  			reslove(res)
  			// 服务取消时卸载 DOM
  			if (res === 'cancel' && saveShareFileInstance !== null) {
  				document.body.removeChild(saveShareFileInstance.$el)
  				saveShareFileInstance = null
  			}
  		}
  		document.body.appendChild(saveShareFileInstance.$el) //  挂载 DOM
  		Vue.nextTick(() => {
  			saveShareFileInstance.visible = true //  打开对话框
  		})
  	})
  }
  
  export default showSaveShareFileDialog
  