保留小数点

clearNoNum(v,num){

        var v =v

        if(v!="") {

            if(num==2) {

                 v = String(v).replace(/[^\d.]/g,"").replace(/\.{2,}/g,".").replace(".","$#$").replace(/\./g,"").replace("$#$",".").replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')

            }

           if(num==4) {

                 v = String(v).replace(/[^\d.]/g,"").replace(/\.{2,}/g,".").replace(".","$#$").replace(/\./g,"").replace("$#$",".").replace(/^(\-)*(\d+)\.(\d\d\d\d).*$/,'$1$2.$3')

           }

            if(num==1) {

                v = String(v).replace(/[^\d.]/g,"").replace(/\.{2,}/g,".").replace(".","$#$").replace(/\./g,"").replace("$#$",".").replace(/^(\-)*(\d+)\.(\d).*$/,'$1$2.$3')

            }

            if(v.indexOf(".")< 0 && v !=""){

              v= parseFloat(v);

            }

            return v

        }

      },