Improve isNumber function
Improve isNumber function

ndtreviv/cropper,fengyuanchen/cropper,liuyan5258/cropper,ashokpant/cropper,guillermomartinez/cropper,mesnilgr/cropper,99designs/cropper,mig1098/cropper,Paulyoufu/cropper,tekinaggul/cropper,iacdingping/cropper,haolee1990/cropper,99designs/cropper,albertonaperijr/cropper,OddPrints/cropper,et-soft/cropper,shinygang/cropper,haolee1990/cropper,Paulyoufu/cropper,VANITAX/cropper,haolee1990/cropper,un33k/cropper,shinygang/cropper,VANITAX/cropper,jemmeliCss/cropper,guillermomartinez/cropper,arkomlueng/cropper,ashokpant/cropper,bercanozcan/cropper,samudiogo/cropper,tekinaggul/cropper,iacdingping/cropper,ashokpant/cropper,salindalakmal/cropper,FuYung/cropper,websdotcom/cropper,samudiogo/cropper,ndtreviv/cropper,timothybannister/cropper,FuYung/cropper,OddPrints/cropper,liuyan5258/cropper,et-soft/cropper,itxd/cropper,salindalakmal/cropper,timothybannister/cropper,FuYung/cropper,itxd/cropper,mig1098/cropper,jemmeliCss/cropper,websdotcom/cropper,guillermomartinez/cropper,un33k/cropper,99designs/cropper,mesnilgr/cropper,albertonaperijr/cropper,arkomlueng/cropper,bercanozcan/cropper,samudiogo/cropper,mesnilgr/cropper,VANITAX/cropper,websdotcom/cropper,mig1098/cropper