string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B8%85%E9%99%A4%E7%94%B5%E8%84%91%E8%BF%90%E8%A1%8C%E5%86%85%E5%AD%98%E5%9E%83%E5%9C%BE => Failed to connect to 61.171.74.35 port 38027: Connection refused"
清除电脑运行内存垃圾
