/*********************
 @Author  :   liuyuqi
 @Contact :   liuyuqi.gov@msn.cn
 @Time    :   2019/07/23 05:54:37
 @Version :   1.0
 @License :   (C)Copyright 2019 liuyuqi.
 @Desc    :   下载文件
*********************/
"downlaod a file..."
    $a = input("Enter download URL", , , "m");
    download $a