string(255) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%87%E4%BB%B6%E9%87%8D%E5%91%BD%E5%90%8D%E7%9A%84%E5%9B%9B%E7%A7%8D%E6%96%B9%E6%B3%95 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
文件重命名的四种方法
