Javascript 如何访问函数对象中的函数？

目前，我已将github中的代码添加到我的代码中：

var ExcelFormulas = {

    PVIF: function(rate, nper) {
        return Math.pow(1 + rate, nper);
    },

    FVIFA: function(rate, nper) {
        return rate == 0? nper: (this.PVIF(rate, nper) - 1) / rate;
    },  

    PMT: function(rate, nper, pv, fv, type) {
        if (!fv) fv = 0;
        if (!type) type = 0;

        if (rate == 0) return -(pv + fv)/nper;
        
        var pvif = Math.pow(1 + rate, nper);
        var pmt = rate / (pvif - 1) * -(pv * pvif + fv);

        if (type == 1) {
            pmt /= (1 + rate);
        };

        return pmt;
    },

    IPMT: function(pv, pmt, rate, per) {
        var tmp = Math.pow(1 + rate, per);
        return 0 - (pv * tmp * rate + pmt * (tmp - 1));
    },

    PPMT: function(rate, per, nper, pv, fv, type) {
        if (per < 1 || (per >= nper + 1)) return null;
        var pmt = this.PMT(rate, nper, pv, fv, type);
        var ipmt = this.IPMT(pv, pmt, rate, per - 1);
        return pmt - ipmt;
    },
    
    DaysBetween: function(date1, date2) {
        var oneDay = 24*60*60*1000;
        return Math.round(Math.abs((date1.getTime() - date2.getTime())/oneDay));
    },
    
    // Change Date and Flow to date and value fields you use
    XNPV: function(rate, values) {
        var xnpv = 0.0;
        var firstDate = new Date(values[0].Date);
        for (var key in values) {
            var tmp = values[key];
            var value = tmp.Flow;
            var date = new Date(tmp.Date);
            xnpv += value / Math.pow(1 + rate, this.DaysBetween(firstDate, date)/365);
        };
        return xnpv;
    },

    XIRR: function(values, guess) {
        if (!guess) guess = 0.1;
        
        var x1 = 0.0;
        var x2 = guess;
        var f1 = this.XNPV(x1, values);
        var f2 = this.XNPV(x2, values);
        
        for (var i = 0; i < 100; i++) {
            if ((f1 * f2) < 0.0) break;
            if (Math.abs(f1) < Math.abs(f2)) {
                f1 = this.XNPV(x1 += 1.6 * (x1 - x2), values);
            }
            else {
                f2 = this.XNPV(x2 += 1.6 * (x2 - x1), values);
            }
        };
        
        if ((f1 * f2) > 0.0) return null;
        
        var f = this.XNPV(x1, values);
        if (f < 0.0) {
            var rtb = x1;
            var dx = x2 - x1;
        }
        else {
            var rtb = x2;
            var dx = x1 - x2;
        };
        
        for (var i = 0; i < 100; i++) {
            dx *= 0.5;
            var x_mid = rtb + dx;
            var f_mid = this.XNPV(x_mid, values);
            if (f_mid <= 0.0) rtb = x_mid;
            if ((Math.abs(f_mid) < 1.0e-6) || (Math.abs(dx) < 1.0e-6)) return x_mid;
        };
        
        return null;
    }

};

但是当我尝试用PPMT做类似的事情时，我得到了null。这就是我正在尝试的：

var values =
[
{rate:0.53, per: 1, nper : 12, pv:10000}
];
alert(ExcelFormulas.XIRR(values));

有人能帮我访问PPMT功能吗？提前谢谢你

旁注：只要有效，您可以输入任何值，我只需要一个示例

您的PPMT函数在定义顶部有一个控制结构

    PPMT: function(rate, per, nper, pv, fv, type) {
        // will return null if condition is met
        if (per < 1 || (per >= nper + 1)) return null;
        var pmt = this.PMT(rate, nper, pv, fv, type);
        var ipmt = this.IPMT(pv, pmt, rate, per - 1);
        return pmt - ipmt;
    },

---

您知道如何调用函数吗？函数被正确调用，因此这必须是关于该函数中的逻辑首先，您仍然在调用XIRR而不是PPMT。其次，PPMT似乎要求6！值，不是对象，不是数组-在您的值中，您只有4个缺少的类型-您应该这样调用它：alertExcelFormulas.PPMTrate、per、nper、pv、fv、type；-要么给出这些值：var rate=0.53，per=1，nper=12，pv=10000，fv=**你需要什么**，type=**你需要什么**；或者直接：alertExcelFormulas.PPMT0.53,1,12,10000，**您需要的任何fv**，**您需要的任何类型**；您不是在调用PPMT函数，而是在调用XIRR函数。在警报中，您应该有Excel公式。PPMT0.53,1,12,10000。你应该有两个更多的值在最后的fv和类型。谢谢大家！这些答案的组合帮助我找到了答案，这真的很有帮助。抱歉，响应时间太长，我的电脑有问题

    PPMT: function(rate, per, nper, pv, fv, type) {
        // will return null if condition is met
        if (per < 1 || (per >= nper + 1)) return null;
        var pmt = this.PMT(rate, nper, pv, fv, type);
        var ipmt = this.IPMT(pv, pmt, rate, per - 1);
        return pmt - ipmt;
    },