优化判断是否是数字类字符串的实现方式
优化判断是否是数字类字符串的实现方式

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