js房贷等额本金与等额本息计算公式及函数

js房贷等额本金与等额本息计算公式及函数

我们在买房的时候经常会被售楼处的小姐问道，要办等额本金还是等额本息呢，我们一般选择等额本息，因为总利息变少了，那么怎么进行计算的呢，今天我们来说一下在html中怎么通过js来实现等额本金及等额本息的计算。

一、等额本金js版

 //等额本金计算
    var benjin=function (type, num, year, lilv) {
        var mouth = parseInt(year) * 12,
            mouthlilv = parseFloat(lilv) / 12,
            dknum = parseFloat(num) * 10000,
            yhbenjin = 0; //首月还款已还本金金额是0
        //每月应还本金=贷款本金÷还款月数
        var everymonthyh = dknum / mouth
        //每月月供额=(贷款本金÷还款月数)+(贷款本金-已归还本金累计额)×月利率
        var yuegong = everymonthyh + (dknum - yhbenjin) * mouthlilv;
        //每月月供递减额=每月应还本金×月利率=贷款本金÷还款月数×月利率
        var yuegongdijian = everymonthyh * mouthlilv;
        //总利息=〔(总贷款额÷还款月数+总贷款额×月利率)+总贷款额÷还款月数×(1+月利率)〕÷2×还款月数-总贷款额
        var totalLixi = ((everymonthyh + dknum * mouthlilv) + dknum / mouth * (1 + mouthlilv)) / 2 * mouth - dknum;
        //还款总额 总利息+贷款本金
        var totalPrice = totalLixi + dknum,
            leftFund = totalLixi + dknum;

        //循环月份
        var mouthdataArray = [],
            nowmouth = new Date().getMonth(),
            realmonth = 0;

        for (var i = 1; i <= mouth; i++) {
            realmonth = nowmouth + i;
            var yearlist = Math.floor(i / 12);

            realmonth = realmonth - 12 * yearlist;

            if (realmonth > 12) {
                realmonth = realmonth - 12
            }
            yhbenjin = everymonthyh * (i - 1);
            var yuebenjin = everymonthyh + (dknum - yhbenjin) * mouthlilv;
     ...

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