爬虫很长时间没用过了，最近试着更新一些数据，结果发现rvest没法直接选到h3里面的内容，各位帮看看是哪里出了问题，谢谢！r library(rvest) #> Loading required package: xml2 sessionInfo() #> R version 3.5.3 (2019-03-11) #> Platform: x86_64-apple-darwin15.6.0 (64-bit) #> Running under: macOS High Sierra 10.13.6 #> #> Matrix products: default #> BLAS: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRblas.0.dylib #> LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib #> #> locale: #> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 #> #> attached base packages: #> [1] stats graphics grDevices utils datasets methods base #> #> other attached packages: #> [1] rvest_0.3.5 xml2_1.3.2 #> #> loaded via a namespace (and not attached): #> [1] Rcpp_1.0.1 digest_0.6.18 R6_2.4.0 magrittr_1.5 #> [5] evaluate_0.13 highr_0.8 httr_1.4.0 stringi_1.4.3 #> [9] rmarkdown_1.12 tools_3.5.3 stringr_1.4.0 xfun_0.5 #> [13] yaml_2.2.0 compiler_3.5.3 htmltools_0.3.6 knitr_1.22 xx <- '<h3 class="on"><li style="width:25%"><em></em>北京市</li><li style="width:15%">通州区</li><li style="width:15%">1300</li><li style="width:13%">16412</li><li style="width:11%">110000</li><li style="width:8%"></li><li style="width:8%"></li></h3>' yy <- read_html(xx) html_structure(yy) #> <html> #> <body> #> <h3.on> #> <li [style]> #> <em> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> <li [style]> html_nodes(yy, '.on > li') #> {xml_nodeset (0)} xx <- gsub('h3', 'ul', xx) yy <- read_html(xx) html_structure(yy) ## changed #> <html> #> <body> #> <ul.on> #> <li [style]> #> <em> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> {text} #> <li [style]> #> <li [style]> html_nodes(yy, '.on > li') #> {xml_nodeset (7)} #> [1] <li style="width:25%">\n<em></em>北京市</li>\n #> [2] <li style="width:15%">通州区</li>\n #> [3] <li style="width:15%">1300</li>\n #> [4] <li style="width:13%">16412</li>\n #> [5] <li style="width:11%">110000</li>\n #> [6] <li style="width:8%">\n #> [7] <li style="width:8%">

<sup>Created on 2020-05-22 by the reprex package (v0.2.1)</sup>