update command desc
update command desc

Qihoo360/thinkjs,akira-cn/thinkjs,snadn/thinkjs,75team/thinkjs,75team/thinkjs,akira-cn/thinkjs,thinkjs/thinkjs,akira-cn/thinkjs,maxzhang/thinkjs,75team/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs