vue3項目如果啟用typescript，單獨引入ElMessage,ElMessageBox樣式時寫法略有不同，如下
import 'element-plus/es/components/message-box/style/index'
import 'element-plus/es/components/message/style/index'
注，如果按以下寫法會報錯
import 'element-plus/es/components/message-box/style'
import 'element-plus/es/components/message/style'
報錯：
Module not found: Error: Can’t resolve ‘element-plus/es/components/message-box/style’
Module not found: Error: Can’t resolve ‘element-plus/es/components/message/style’