crawler-demo demo from crawler document crawler-document npm install crawler npm github cheerio node-mysql npm install mysql github mysql test website doubanTop250 useful link node-crawler-中文文档 node爬虫-知乎 node-爬虫-博客 cheerio-中文文档 mysql常用指令-博客 在node项目中操作mysql-知乎 node中批量操作mysql