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js高精度计算-2013年9月6号技术分享-付培举

技术文档
09/06/2013

/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;
}
// 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(n);
}
// 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);
}

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