string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E6%B8%85%E9%99%A4%E7%94%B5%E8%84%91%E9%87%8C%E9%9D%A2%E7%9A%84%E5%86%85%E5%AD%98 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
怎么清除电脑里面的内存
