js two floating point numbers addition, subtraction, multiplication and division

Enter two numbers on the page and perform operations
//add    
function floatAdd(arg1,arg2){  
  // If arg1 is empty, defaults to 0
  if(isNaN(arg1)) {
    arg1 = 0;
  }
  // If arg2 is empty, defaults to 0
  if(isNaN(arg2)) {
    arg2 = 0;
  }
  var r1, r2, m;    
  try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}    
  try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}    
  m = Math.pow(10,Math.max(r1,r2));
  var s = (arg1*m+arg2*m)/m;
  // if 1.00 + 2.00 then return 3.00 (if not, return 3)
  try{s.toString().split(".")[1].length}catch(e){s = s + ".00"};
  return s;    
}    
      
//reduce    
function floatSub(arg1,arg2){    
    var r1, r2, m, n;    
    try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}    
    try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}    
    m=Math.pow(10,Math.max(r1,r2));    
    //Dynamic control precision length    
    n=(r1>=r2)?r1:r2;    
    return ((arg1*m-arg2*m)/m).toFixed(n);    
}    
       
//take    
function floatMul(arg1,arg2)   {     
    var m=0,s1=arg1.toString(),s2=arg2.toString();     
    try{m+=s1.split(".")[1].length}catch(e){}     
    try{m+=s2.split(".")[1].length}catch(e){}     
    return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m);     
}     
      
      
//remove   
function floatDiv (arg1, arg2) {     
      var t1 = 0, t2 = 0, r1, r2;     
      try{t1=arg1.toString().split(".")[1].length}catch(e){}     
      try{t2=arg2.toString().split(".")[1].length}catch(e){}     
        
      r1=Number(arg1.toString().replace(".",""));  
   
      r2=Number(arg2.toString().replace(".",""));     
      return (r1/r2)*Math.pow(10,t2-t1);     
}