qiankun兼容ie11

import 'whatwg-fetch' // 兼容IE110， fetch poliify
import 'custom-event-polyfill'
import 'core-js/stable/promise'
import 'core-js/stable/symbol'
import 'core-js/stable/string/starts-with'
import 'core-js/web/url' // 兼容IE window.URL, url-polyfill库有问题
import 'core-js/stable/array/find'
import 'core-js/stable/promise'