網絡與半徑誤差刮

Question

我想刮sainsburys.co.uk，我運行中的R

doc <- htmlTreeParse('http://www.sainsburys.co.uk/shop/gb/groceries/fruit-veg/all-fruit#langId=44&storeId=10151&catalogId=10122&categoryId=12545&parent_category_rn=12518&top_category=12518&pageSize=30&orderBy=FAVOURITES_FIRST&searchTerm') 

rootNode <- xmlRoot(doc) 

下一個代碼，但我有這樣的錯誤：

Error in x$children[[1]] : subscript out of bounds 

我是什麼做錯了？

Answer 1

你可以嘗試httr庫：

library(XML) 
library(httr) 
url <- 'http://www.sainsburys.co.uk/shop/gb/groceries/fruit-veg/all-fruit#langId=44&storeId=10151&catalogId=10122&categoryId=12545&parent_category_rn=12518&top_category=12518&pageSize=30&orderBy=FAVOURITES_FIRST&searchTerm' 
doc <- content(GET(url),type="text/html") 
xmlValue(doc["//title"][[1]]) 
# [1] "All fruit | Sainsbury's"