string(321) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%87%80%E5%88%A9%E6%B6%A6%E7%9A%84%E8%AE%A1%E7%AE%97%E6%98%AF%E4%BB%A5%E6%94%B6%E4%BB%98%E5%AE%9E%E7%8E%B0%E5%88%B6%E4%B8%BA%E5%9F%BA%E7%A1%80%E7%9A%84 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
净利润的计算是以收付实现制为基础的
