How to limit the input of only positive and negative numbers and decimal numbers

//Positive number, including decimal number
isFloor(e,type){
   if(type=='floor') {
    var val=;
    //Limit only one decimal point    if ((".") != -1) {
     var str = ((".") + 1);
     if ((".") != -1) {
      val = (0, (".") + (".") + 1);
     }
    }
     = (/[^\d^\.]+/g,'');
   }
   
  },
//Positive and negative numbers, including decimals
isFloor(){
 var obj=;
 var t = (0); 
  = (".", "$#$")//Replace the first character '.' with '$#$' .replace(/\./g, "")//Replace the remaining characters '.' with empty               .replace("$#$", ".")//Replace the character '$#$' back to the original '.' .replace(/[^\d.]/g, "")//Only enter numbers and '.'               .replace(/^\./g, "")//Cannot start with '.'               .replace( /([0-9]+\.[0-9]{2})[0-9]*/,"$1")//Only 2 decimal places are retained if (t == '-') {
   = '-' + ;
 } 
}