按官方文档 https://ionicframework.com/docs/api/infinite-scroll-content
loadingSpinner有如下可选值:
bubbles
circles
circular
crescent
dots
lines(默认)
lines-small
按官方文档 https://ionicframework.com/docs/api/infinite-scroll-content
bubbles
circles
circular
crescent
dots
lines(默认)
lines-small