如何在底部禁用data.table名称？

您可以将对象的打印操作为常规字符向量.

library(data.table)
options(datatable.print.nrows = Inf)
dt = data.table(sample.int(2e3, 1e4, T))
myprint = function(x){
    prnt = capture.output(print(x))
    cat(prnt[-length(prnt)], sep="\n")
}
myprint(dt[ , .(.N), V1])