string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=rank%E5%87%BD%E6%95%B0%E8%AE%A1%E7%AE%97%E6%8E%92%E5%90%8D%E6%80%8E%E4%B9%88%E7%94%A8 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
rank函数计算排名怎么用
