1，根目录下images和data目录无写入权限（注：包括其下子目录）
2，服务器没有开启文件上传功能
造成缩略图无法生成主要原因：服务器没有开启GD库功能
Customer service center oddress A, No. 61, New Rood,Mocou, the 14th floor of Yongguang Plazo A 21st Floor, Block A, Manulife Financal Centre, 223-231 Wai Yip Street, Kwun Tong Kowloon, Hong Kong Customer service center oddress A, No. 61, New Rood,Mocou, the 14th floor of Yongguang Plazo A