axios简单实现小程序延时loading指示

export const loadingStatus$: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false)axios.interceptors.request.use( (config: any) => {  loadingStatus$.next(true)  return config }, (error: any) => {  return Promise.reject(error) },)axios.interceptors.response.use( (response: any) => {  loadingStatus$.next(false)  return response.data }, (error: any) => {  loadingStatus$.next(false)  wx.showToast({ title: 'something wrong happened, please try it later' })  return Promise.reject(error) },)

let timer: any = 0loadingStatus$.pipe( pairwise(), filter((res: Array<boolean>) => {  if (res[0] !== res[1]) {   return true  } else {   return false  } }), map((res: Array<boolean>) => {  return res[1] }),).subscribe((res: boolean) => { // once changed, value must be distinct if (timer === 0) {  timer = setTimeout(() => {   wx.showLoading({ title: 'loading...' })  }, 1000) } else {  clearTimeout(timer)  timer=0  wx.hideLoading() }})