Loss of accuracy of addition, subtraction, multiplication and division of decimals in JavaScript

1. The problem we encountered in this project was the addition of four numbers

accAdd(arg1, arg2, arg3, arg4) {
      var r1, r2, r3, r4, m;
      try {
        r1 = arg1.toString().split(".") [1].length;
      } catch (e) {
        r1 = 0;
      }
      try {
        r2 = arg2.toString().split(".") [1].length;
      } catch (e) {
        r2 = 0;
      }
      try {
        r3 = arg3.toString().split(".") [1].length;
      } catch (e) {
        r3 = 0;
      }
      try {
        r4 = arg4.toString().split(".") [1].length;
      } catch (e) {
        r4 = 0;
      }
      m = Math.pow(10.Math.max(r1, r2, r3, r4));
      return (arg1 * m + arg2 * m + arg3 * m + arg4 * m) / m;
    },
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2. See some of the complete methods online at www.jb51.net/article/854…

/ / division
function accDiv(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){} 
 with(Math){ 
    r1=Number(arg1.toString().replace("."."")) 
    r2=Number(arg2.toString().replace("."."")) 
     return accMul((r1/r2),pow(10,t2-t1)); }}/ / the multiplication
 function accMul(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) 
 } 
/ / add
function accAdd(arg1,arg2){ 
    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)) 
    return (arg1*m+arg2*m)/m 
} 
/ / subtraction
function Subtr(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)); n=(r1>=r2)? r1:r2;return ((arg1*m-arg2*m)/m).toFixed(n); 
}
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