string(244) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=rank%E6%8E%92%E5%90%8D%E5%87%BD%E6%95%B0%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
rank排名函数使用方法
