fix pid bug
fix pid bug

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