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library(rvest) myurl <- "http://www.boohee.com/food/group/" food_cal <- ...
一. Workspace and Files 1. getwd()當(dāng)前的工作空間 2. ls()工作空間下所有對(duì)象 3. list.files(...
1. read_html(url, encoding = "") 下載html頁(yè)面, url為網(wǎng)址，encoding為網(wǎng)址編碼 2. html_...