string(249) "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%96%B9%E5%BC%8F%E6%98%AF => Failed to connect to 101.89.159.206 port 38100: Connection refused"
净利润的计算方式是
