JS浮点精确运算

[js title="浮点数相加"]
function dcmAdd(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 (dcmMul(arg1,m)+dcmMul(arg2,m))/m;
}
[/js]


[js title="浮点数相减"]
function dcmSbt(arg1,arg2){
return dcmAdd(arg1,-arg2);
}
[/js]

[js title="浮点数相乘"]
function dcmMul(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);
}
[/js]

[js title="浮点数除"]
function dcmDiv(arg1,arg2){
return dcmMul(arg1,1/arg2);
}
[/js]