string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BE%97%E7%A5%A8%E7%8E%87%E7%9A%84%E8%AE%A1%E7%AE%97%E5%85%AC%E5%BC%8F => Failed to connect to 14.18.46.51 port 38044: Connection refused"
得票率的计算公式
