string(267) "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%E5%A6%82%E4%BD%95%E7%AE%97%E5%87%BA%E5%88%A9%E6%B6%A6%E6%80%BB%E9%A2%9D => Failed to connect to 101.89.159.206 port 38087: Connection refused"
净利润如何算出利润总额
