string(271) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8rank%E5%87%BD%E6%95%B0%E6%8E%92%E5%90%8D%E7%99%BE%E5%88%86%E6%95%B0 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
如何使用rank函数排名百分数
