string(296) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%A9%E7%94%A8rank%E5%87%BD%E6%95%B0%E8%BF%9B%E8%A1%8C%E9%99%8D%E5%BA%8F%E6%8E%92%E5%90%8D%E6%80%8E%E4%B9%88%E6%93%8D%E4%BD%9C => Failed to connect to 14.116.215.7 port 38225: Connection refused"
利用rank函数进行降序排名怎么操作
