vue组件通信及eventBus销毁、侦听处理

import Vue from 'vue'
export default new Vue()

import Bus from '@/store/Bus'

Bus.$emit('exportExcelFn')

import Bus from '@/store/Bus'
// 销毁上一个侦听器、不然会调用多次
Bus.$off('exportExcelFn')
Bus.$on("exportExcelFn", () => {
  this.$ExportExcel({
    columns: this.columns,
    tableData: this.$attrs.data,
    tableTitle: this.tableTitle,
    btnTitle: this.btnTitle,
    multipleSelection: this.multipleSelection
 })
})