arrToObj支持只返回key的集合
arrToObj支持只返回key的集合

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