string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ipad%E6%80%8E%E4%B9%88%E8%83%BD%E6%B8%85%E7%90%86%E5%86%85%E5%AD%98%E5%92%8C%E5%86%85%E5%AD%98 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
ipad怎么能清理内存和内存
