string(277) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=u%E7%9B%98%E7%94%A8%E5%93%AA%E7%A7%8D%E6%96%87%E4%BB%B6%E6%96%B9%E5%BC%8F%E6%A0%BC%E5%BC%8F%E5%8C%96%E5%A5%BD => Failed to connect to 125.88.227.171 port 38114: Connection refused"
u盘用哪种文件方式格式化好
