文件上传遇到的兼容问题

[aNd1coder]

http://samgui.com/blog/%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E9%81%87%E5%88%B0%E7%9A%84%E5%85%BC%E5%AE%B9%E9%97%AE%E9%A2%98/