純js版本房貸計算器

前言

純js版本的房貸計算器，介面精美。

介面

原始碼地址：

github地址：

https://github.com/confidence68/houseCal

預覽地址：

https://www.haorooms.com/uploads/loancal/

核心程式碼

[JavaScript]

純文字檢視

複製程式碼

?

001

002

003

004

005

006

007

008

009

010

011

012

013

014

015

016

017

018

019

020

021

022

023

024

025

026

027

028

029

030

031

032

033

034

035

036

037

038

039

040

041

042

043

044

045

046

047

048

049

050

051

052

053

054

055

056

057

058

059

060

061

062

063

064

065

066

067

068

069

070

071

072

073

074

075

076

077

078

079

080

081

082

083

084

085

086

087

088

089

090

091

092

093

094

095

096

097

098

099

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

//等額本息計算

benxi: function (type, num, year, lilv) {

//每月月供額=〔貸款本金×月利率×(1＋月利率)＾還款月數〕÷〔(1＋月利率)＾還款月數-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);

//總利息=還款月數×每月月供額-貸款本金

var totalLixi = mouth * yuegong - dknum;

//還款總額總利息+貸款本金

var totalPrice = totalLixi + dknum,

leftFund = totalLixi + dknum;

//迴圈月份

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)

//每月應還利息=貸款本金×月利率×〔(1+月利率)^還款月數-(1+月利率)^(還款月序號-1)〕÷〔(1+月利率)^還款月數-1〕

var

yuelixi = dknum * mouthlilv * (Math.pow((1 + mouthlilv), mouth) - Math.pow((1 + mouthlilv), i - 1)) / (Math.pow((1 + mouthlilv), mouth) - 1);

//每月應還本金=貸款本金×月利率×(1+月利率)^(還款月序號-1)÷〔(1+月利率)^還款月數-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,

//剩餘還款

leftFund: leftFund

}

return {

yuegong: yuegong,

totalLixi: totalLixi,

totalPrice: totalPrice,

mouthdataArray: mouthdataArray,

totalDknum: num,

year: year

};

},

//等額本金計算

benjin: function (type, num, year, lilv) {

var mouth = parseInt(year) * 12,

mouthlilv = parseFloat(lilv) / 12,

dknum = parseFloat(num) * 10000,

yhbenjin = 0; //首月還款已還本金金額是0

//每月應還本金=貸款本金÷還款月數

var everymonthyh = dknum / mouth

//每月月供額=(貸款本金÷還款月數)+(貸款本金-已歸還本金累計額)×月利率

var yuegong = everymonthyh + (dknum - yhbenjin) * mouthlilv;

//每月月供遞減額=每月應還本金×月利率=貸款本金÷還款月數×月利率

var yuegongdijian = everymonthyh * mouthlilv;

//總利息=〔(總貸款額÷還款月數+總貸款額×月利率)+總貸款額÷還款月數×(1+月利率)〕÷2×還款月數-總貸款額

var totalLixi = ((everymonthyh + dknum * mouthlilv) + dknum / mouth * (1 + mouthlilv)) / 2 * mouth - dknum;