text: import Vue from 'vue'
  // 导入组件
  import CopyFileDialog from './Dialog.vue'
  // 使用基础 Vue 构造器，创建一个“子类”
  const CopyFileConstructor = Vue.extend(CopyFileDialog)
  
  let copyFileInstance = null
  /**
   * 初始化复制文件实例
   * @param {object | array} fileInfo 要复制的文件信息
   */
  const initInstanceCopyFile = (fileInfo) => {
  	copyFileInstance = new CopyFileConstructor({
  		el: document.createElement('div'),
  		data() {
  			return {
  				fileInfo
  			}
  		}
  	})
  }
  /**
   * 复制文件 Promise 函数
   * @returns {Promise} 抛出确认和取消回调函数
   */
  const showCopyFileDialog = (obj) => {
  	// 非首次调用服务时，在 DOM 中移除上个实例
  	if (copyFileInstance !== null) {
  		document.body.removeChild(copyFileInstance.$el)
  	}
  	let { fileInfo } = obj
  	return new Promise((reslove) => {
  		initInstanceCopyFile(fileInfo)
  		copyFileInstance.callback = (res) => {
  			reslove(res)
  			// 服务取消时卸载 DOM
  			if (res === 'cancel' && copyFileInstance !== null) {
  				document.body.removeChild(copyFileInstance.$el)
  				copyFileInstance = null
  			}
  		}
  		document.body.appendChild(copyFileInstance.$el) //  挂载 DOM
  		Vue.nextTick(() => {
  			copyFileInstance.visible = true //  打开对话框
  		})
  	})
  }
  
  export default showCopyFileDialog
  