赫然想到是否可以直接用R下載檔案，
發現真的有相關函式，
就是download.file。
你可以給他網址，
並且設定檔案名稱，
即可將檔案下載下來，
配合網路爬蟲抓取多個URL即可自動化下載多個檔案了(?)。
下面有程式碼範例。
When I was using crawler,
I found a interesting function called download.file.
You give it the url of the file you want to download,
and give it a file name.
Then you can download the file with this function.
I think download.file can coordinate with crawler,
and download many files automatically.
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| url <- "https://exam.tcte.edu.tw/105_4y/105-4y-00-ma.pdf" | |
| destfile <- "myfile.pdf" | |
| download.file(url, destfile, mode="wb") |
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