string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%B5%E8%84%91%E5%86%85%E5%AD%98%E6%B8%85%E7%90%86%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
电脑内存清理方法
