js 计算精度处理

// 加
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;
}

// 减
function accSub(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);
}

// 乘
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);
}

// 除
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) { }
    r1 = Number(arg1.toString().replace(".", ""));
    r2 = Number(arg2.toString().replace(".", ""));
    if (r2 == 0) {
        return Infinity;
    } else {
        return (r1 / r2) * Math.pow(10, t2 - t1);
    }
}

原文链接：https://blog.csdn.net/helloschurmi/article/details/128844376