string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%93%B6%E8%A1%8C%E8%AE%A1%E7%AE%97%E5%88%A9%E7%8E%87%E7%9A%84%E5%85%AC%E5%BC%8F => Failed to connect to 101.89.120.29 port 38104: Connection refused"
银行计算利率的公式
