清除文件缓存时将delete 改为null
清除文件缓存时将delete 改为null

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