JS 关于小数的精确计算

//js 加法计算
//调用：accAdd(arg1,arg2)
//返回值：arg1加arg2的精确结果
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).toFixed(2);
}
//js 减法计算
//调用：Subtr(arg1,arg2)
//返回值：arg1减arg2的精确结果
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));
//last modify by deeka
//动态控制精度长度
n=(r1>=r2)?r1:r2;
return ((arg1*m-arg2*m)/m).toFixed(2);
}
//js 除法函数
//调用：accDiv(arg1,arg2)
//返回值：arg1除以arg2的精确结果
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);
}
}

//js 乘法函数
//调用：accMul(arg1,arg2)
//返回值：arg1乘以arg2的精确结果
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)
}