Js four arithmetic function code_javascript skills

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//Division function, used to get accurate division results
//Note: The division result of JavaScript will have errors, which will be more obvious when dividing two floating point numbers. This function returns a more accurate division result.
//Call: accDiv(arg1,arg2)
//Return value: the exact result of dividing arg1 by arg2
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 (r1/r2)*pow(10,t2-t1);
}
}
//Add a div method to the Number type to make it more convenient to call.
Number.prototype.div = function (arg){
return accDiv(this, arg);
};
//Multiplication function, used to get accurate multiplication results
// Note: The multiplication result of JavaScript will have errors, which will be more obvious when two floating point numbers are multiplied. This function returns a more accurate multiplication result.
//Call: accMul(arg1,arg2)
//Return value: the exact result of arg1 multiplied by arg2
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 a mul method to the Number type to make it more convenient to call.
Number.prototype.mul = function (arg){
return accMul(arg, this);
};
//Addition function, used to get accurate addition results
// Note: The addition result of JavaScript will have errors, which will be more obvious when adding two floating point numbers. This function returns a more accurate addition result.
//Call: accAdd(arg1,arg2)
//Return value: the exact result of arg1 plus arg2
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;
}
//Add an add method to the Number type to make it more convenient to call.
Number.prototype.add = function (arg){
return accAdd(arg,this);
};
//Subtraction function
function accSub(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));
//last modify by deeka
//Dynamic control precision length
n= (r1>=r2)?r1:r2;
return ((arg2*m-arg1*m)/m).toFixed(n);
}
///Add a sub to the number class method, which is more convenient to call
Number.prototype.sub = function (arg){
return accSub(arg,this);
};