修正文件上传的bug
修正文件上传的bug

Qihoo360/thinkjs,maxzhang/thinkjs,thinkjs/thinkjs,snadn/thinkjs,akira-cn/thinkjs,75team/thinkjs,lukw00/thinkjs,akira-cn/thinkjs,75team/thinkjs,maxzhang/thinkjs,akira-cn/thinkjs,74sharlock/thinkjs,75team/thinkjs,74sharlock/thinkjs,lukw00/thinkjs,maxzhang/thinkjs