我想使用 rvest 来获取网站上一些链接的完整网址。 当我搜刮这些链接时，我得到的是一个缩略版的URL。
我如何获得完整的URL？
这里有一个例子。
library(rvest)
#> Loading required package: xml2
page <- read_html("http://developer.cbssports.com/documentation/api/files/history/standings/breakdown")
urls <- page %>%
html_nodes(".MFile") %>%
html_nodes("a") %>%
html_attr("href")
urls
#> [1] "../../draft-config"
#> [2] "../../draft-order"
#> [3] "../../draft-results"
#> [4] "../../owners"
#> [5] "../../fantasy-points"
#> [6] "../../teams"
#> [7] "../awards"
#> [8] "../championships"
#> [9] "../draft-results"
#> [10] "../draft-stats"
#> [11] "../league-records"
#> [12] "../league-years"
#> [13] "../results"
#> [14] "../rosters"
#> [15] "../team-records"
#> [16] "../teams"
#> [17] "../transaction-list"
#> [18] "../vs-opponent"
#> [19] "overall"
#> [20] "power"
#> [21] "../../dates"
#> [22] "../../league-details"
#> [23] "../../league-stats"
#> [24] "../../playoff-bracket"
#> [25] "../../playoff-settings"
#> [26] "../../positions"
#> [27] "../../pro-teams"
#> [28] "../../rosters"
#> [29] "../../rules"
#> [30] "../../schedules"
#> [31] "../../sports"
#> [32] "../../stats"
#> [33] "../../fantasy-points/weekly-scoring"
#> [34] "../../news/headlines"
#> [35] "../../league-news/headlines"
#> [36] "../../players/average-draft-position"
#> [37] "../../players/inactives"
#> [38] "../../players/auction-values"
#> [39] "../../players/gamelog"
#> [40] "../../players/injuries"
#> [41] "../../players/list"
#> [42] "../../players/minors"
#> [43] "../../players/outlook"
#> [44] "../../players/outlooks"
#> [45] "../../players/profile"
#> [46] "../../players/rankings"
#> [47] "../../players/search"
#> [48] "../../players/updates"
#> [49] "../../players/probable-pitchers"
#> [50] "../../players/roster-trends/most-activated"
#> [51] "../../players/roster-trends/most-added"
#> [52] "../../players/roster-trends/most-benched"
#> [53] "../../players/roster-trends/most-dropped"
#> [54] "../../players/roster-trends/most-owned"
#> [55] "../../players/roster-trends/most-started"
#> [56] "../../players/roster-trends/most-traded"
#> [57] "../../players/roster-trends/most-viewed"
#> [58] "../../players/scout-team"
#> [59] "../../players/two-start-pitchers"
#> [60] "../../scoring/live"
#> [61] "../../scoring/preview"
#> [62] "../../scoring/categories"
#> [63] "../../scoring/rules"
#> [64] "../../standings/breakdown"
#> [65] "../../standings/by-period"
#> [66] "../../standings/overall"
#> [67] "../../standings/power"
#> [68] "../../stats/batter-vs-pitcher"
#> [69] "../../stats/defense-vs-position"
#> [70] "../../stats/situational-stats"
#> [71] "../../stats/categories"
#> [72] "../../news/story"
#> [73] "../../league-news/story"
#> [74] "../../transaction-list/add-drops"
#> [75] "../../transaction-list/trades"
#> [76] "../../transaction-list/log"
#> [77] "../../transactions/add-drop"
#> [78] "../../transactions/lineup"
#> [79] "../../transactions/trade"
#> [80] "../../transactions/waiver-order"
#> [81] "../../wildcards"
以第一个结果为例
该链接的完整URL是 http:/developer.cbssports.comdocumentationapifilesdraft-config。. 似乎我在搜刮时只得到了URL的末尾。
你可以使用 xml2::url_absolute :
main_url <- "http://developer.cbssports.com/documentation/api/files/history/standings/breakdown"
xml2::url_absolute(urls, main_url)
#> [1] "http://developer.cbssports.com/documentation/api/files/draft-config"
#> [2] "http://developer.cbssports.com/documentation/api/files/draft-order"
#> [3] "http://developer.cbssports.com/documentation/api/files/draft-results"
#> [4] "http://developer.cbssports.com/documentation/api/files/owners"
#> [5] "http://developer.cbssports.com/documentation/api/files/fantasy-points"
#> [6] "http://developer.cbssports.com/documentation/api/files/teams"
#> [7] "http://developer.cbssports.com/documentation/api/files/history/awards"
#> [8] "http://developer.cbssports.com/documentation/api/files/history/championships"
#> [9] "http://developer.cbssports.com/documentation/api/files/history/draft-results"
#> [10] "http://developer.cbssports.com/documentation/api/files/history/draft-stats"
#> [11] "http://developer.cbssports.com/documentation/api/files/history/league-records"
#> [12] "http://developer.cbssports.com/documentation/api/files/history/league-years"
#> [13] "http://developer.cbssports.com/documentation/api/files/history/results"
#> [14] "http://developer.cbssports.com/documentation/api/files/history/rosters"
#> [15] "http://developer.cbssports.com/documentation/api/files/history/team-records"
#> [16] "http://developer.cbssports.com/documentation/api/files/history/teams"
#> [17] "http://developer.cbssports.com/documentation/api/files/history/transaction-list"
#> [18] "http://developer.cbssports.com/documentation/api/files/history/vs-opponent"
#> [19] "http://developer.cbssports.com/documentation/api/files/history/standings/overall"
#> [20] "http://developer.cbssports.com/documentation/api/files/history/standings/power"
#> [21] "http://developer.cbssports.com/documentation/api/files/dates"
#> [22] "http://developer.cbssports.com/documentation/api/files/league-details"
#> [23] "http://developer.cbssports.com/documentation/api/files/league-stats"
#> [24] "http://developer.cbssports.com/documentation/api/files/playoff-bracket"
#> ... etc