JS实现的比较精确的计算
/**
* 金钱类型(提供JS比较精确的计算)
*/
var BigDecimal = new Object();
/**
* 除法函数
*/
BigDecimal.accDiv = function(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);
}
};
/**
* 乘法函数
*/
BigDecimal.accMul = function(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);
};
/**
* 加法函数
*/
BigDecimal.accAdd = function(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;
};
/**
* 减法函数
*/
BigDecimal.accSub = function(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);
};
/**
* 添加千位符并且保留2位小数
*/
BigDecimal.milliFormat = function(s) {
if(/[^0-9\.]/.test(s)) return "invalid value";
s=s.replace(/^(\d*)$/,"$1.");
s=(s+"00").replace(/(\d*\.\d\d)\d*/,"$1");
s=s.replace(".",",");
var re=/(\d)(\d{3},)/;
while(re.test(s)){
s=s.replace(re,"$1,$2");
}
s=s.replace(/,(\d\d)$/,".$1");
return s.replace(/^\./,"0.")
};