您可以使用future程序包的“并行”赋值运算符%<-%。例如，

library(qualtRics)

library(future)                  # parallel assignment operator %<-%
plan(multisession, workers = 2L) # increase for more parallel workers

qualtrics_api_credentials(api_key = "API KEY",base_url = "url",install = TRUE,overwrite=TRUE)

split_qualtrics %<-% fetch_survey(surveyID = SURVEYID,
                                  unanswer_recode     = -99,
                                  unanswer_recode_multi = 0,
                                  breakout_sets = TRUE,
                                  label = TRUE,
                                  force_request = TRUE,
                                  verbose = FALSE)

nonsplit_qualitrics %<-% fetch_survey(surveyID = SURVEYID,
                                      unanswer_recode = -99,
                                      unanswer_recode_multi = 0,
                                      breakout_sets = FALSE,
                                      label = TRUE,
                                      force_request = TRUE,
                                      verbose = FALSE)

这将导致两个函数调用同时并行运行。当你“触摸”split_qualtrics时，例如试图打印它的值，你的R提示符将被阻塞，直到split_qualtrics可用（nonsplit_qualitrics保持在后台运行）。同样的规则适用于nonsplit_qualitrics。所以，如果你做了很多这样的事情，它们都将在后台运行。