如何在windows编程中做“选择文件”功能？(how to make “choose file” function on windows programming?)

 是。 如果您有包的列表，请将其与installed.packages()[,"Package"]的输出进行比较，并安装缺少的包。 这样的事情 
 
list.of.packages <- c("ggplot2", "Rcpp")
new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,"Package"])]
if(length(new.packages)) install.packages(new.packages)
 
 除此以外： 
 
 如果您将代码放在一个包中并使其成为依赖关系，则在安装包时将自动安装。 

Yes. If you have your list of packages, compare it to the output from installed.packages()[,"Package"] and install the missing packages. Something like this:
 
list.of.packages <- c("ggplot2", "Rcpp")
new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,"Package"])]
if(length(new.packages)) install.packages(new.packages)
 
Otherwise:
 
If you put your code in a package and make them dependencies, then they will automatically be installed when you install your package.