JS高精度加減乘除

//加法
function accAdd(arg1, arg2) {
    var r1, r2, max;
    try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
    try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
    max = Math.pow(10, Math.max(r1, r2))
    return (arg1 * max + arg2 * max) / max
}

//減法
function accSub(arg1, arg2) {
    var r1, r2, max, min;
    try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
    try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
    max = Math.pow(10, Math.max(r1, r2));
    //動态控制精度長度
    min = (r1 >= r2) ? r1 : r2;
    return ((arg1 * max - arg2 * max) / max).toFixed(min)
}

//乘法
function accMul(arg1, arg2) {
    var max = 0, s1 = arg1.toString(), s2 = arg2.toString();
    try { max += s1.split(".")[1].length } catch (e) { }
    try { max += s2.split(".")[1].length } catch (e) { }
    return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, max)
}

//除法
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)
    }
}