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url<-"https://www.wcc.nrcs.usda.gov/ftpref/data/climate/table/temperature/history/california/"
###下载文件
doc <- htmlParse(url,encoding='UTF-8')
Warning message:
XML content does not seem to be XML: 'https://www.wcc.nrcs.usda.gov/ftpref/data/climate/table/temperature/history/california/'
hrefs<-xpathSApply(rootNode,"//a/@href")
names<-xpathSApply(rootNode,"//tbody/tr/td",xmlValue) # /td:td层的内容xmlValue 这个到底怎么解呀?
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