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; //每月应还利息=剩余本金×月利率=(贷款本金-已归还本金累计额)×月利率 var yuelixi = (dknum - yhbenjin) * mouthlilv; leftFund = leftFund - yuebenjin; if (leftFund < 0) { leftFund = 0 } mouthdataArray[i - 1] = { monthName: realmonth + "月", yuelixi: yuelixi, //每月本金 yuebenjin: everymonthyh, //剩余还款 leftFund: leftFund } } return { yuegong: yuegong, totalLixi: totalLixi, totalPrice: totalPrice, yuegongdijian: yuegongdijian, mouthdataArray: mouthdataArray, totalDknum: num, year: year } };
二、等额本息js版
//等额本息计算 var benxi= function (type, num, year, lilv) { //每月月供额=〔贷款本金×月利率×(1+月利率)^还款月数〕÷〔(1+月利率)^还款月数-1〕 var mouth = parseInt(year) * 12, mouthlilv = parseFloat(lilv) / 12, dknum = parseFloat(num) * 10000; //每月月供 var yuegong = (dknum * mouthlilv * Math.pow((1 + mouthlilv), mouth)) / (Math.pow((1 + mouthlilv), mouth) - 1); //总利息=还款月数×每月月供额-贷款本金 var totalLixi = mouth * yuegong - 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 } //console.log(realmonth) //每月应还利息=贷款本金×月利率×〔(1+月利率)^还款月数-(1+月利率)^(还款月序号-1)〕÷〔(1+月利率)^还款月数-1〕 var yuelixi = dknum * mouthlilv * (Math.pow((1 + mouthlilv), mouth) - Math.pow((1 + mouthlilv), i - 1)) / (Math.pow((1 + mouthlilv), mouth) - 1); //每月应还本金=贷款本金×月利率×(1+月利率)^(还款月序号-1)÷〔(1+月利率)^还款月数-1〕 var yuebenjin = dknum * mouthlilv * Math.pow((1 + mouthlilv), i - 1) / (Math.pow((1 + mouthlilv), mouth) - 1); leftFund = leftFund - (yuelixi + yuebenjin); if (leftFund < 0) { leftFund = 0 } mouthdataArray[i - 1] = { monthName: realmonth + "月", yuelixi: yuelixi, yuebenjin: yuebenjin, //剩余还款 leftFund: leftFund } } return { yuegong: yuegong, totalLixi: totalLixi, totalPrice: totalPrice, mouthdataArray: mouthdataArray, totalDknum: num, year: year }; };
完整的在线webide地址:http://studio.bfw.wiki/Studio/Open.html?projectid=15850568146636220062
打开后直接在线克隆就可开发修改
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