Set character.only on TRUE

Packages <- c("ggplot2", "lme4")
Packages %in% loadedNamespaces() # check if the packages are loaded
# [1] FALSE FALSE

pacman::p_load(Packages, character.only = TRUE)

Packages %in% loadedNamespaces()
# [1] TRUE TRUE

来自?p_load:

"character.only : 逻辑.如果为 TRUE，那么 p_load 将只接受单个输入，它是一个包含要加载的包名称的字符向量."

"character.only : logical. If TRUE then p_load will only accept a single input which is a character vector containing the names of packages to load."