JS计算十万块钱 分31期 利息万分之五 每个月的还款数

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>TEST</title>
</head>
<body>
<script type="text/javascript">
let lx = 0.0005;   // 利率
let ben = 100000;  // 本金
let time = 31;     // 分期数
let huan = 0;      // 一个月还多少
let yi = 0;        // 总利息
let sheng = 0;     // 未还本金
let all = 0;       // 总金额
for (let i = 0; i < time; i++) {
    // 一期还款金额 = （本金/分期数）+（（本金-已经还款金额）*利率）
    huan = ((ben/time)+((ben -(ben/time)*i)*lx)*30);
    yi += (((ben -(ben/time)*i)*lx)*30);
    all += huan;
    sheng = (ben - (ben/time)*i);
    console.log("待还本金："+parseInt(sheng)+" => 还款金额："+parseInt(huan)+" = 本金："+parseInt(ben/time)+" + 利息："+parseInt((ben -(ben/time)*i)*lx)*30)
}
console.warn("总金额："+parseInt(all))
console.warn("总利息："+parseInt(yi))
console.error("分"+time+"个月还，一个月还："+parseInt(all/time))
</script>
</body>
</html>

由于我在网上找不到这种算法的在线计算器，所以就自己写一个玩玩，如下图：

提示：假如每个月都是30天

 完善思路：把每个月30天改为对应月份的天数，和显示还款日期。

------------------------------------------------------- 2019-03-18更新------------------------------------------------------------

由于我们是有追求的人，直接用console.log()打印显得太low,自己都看不下去，所以决定给它个皮肤，加入对应月份天数和还款日期，好见人。

  1 <!DOCTYPE html>
  2 <html>
  3   <head>
  4     <meta charset="UTF-8" />
  5     <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  6     <title>zhengshize</title>
  7     <link
  8       rel="stylesheet"
  9       type="text/css"
 10       href="http://unpkg.com/iview/dist/styles/iview.css"
 11     />
 12     <script
 13       type="text/javascript"
 14       src="http://vuejs.org/js/vue.min.js"
 15     ></script>
 16     <script
 17       type="text/javascript"
 18       src="http://unpkg.com/iview/dist/iview.min.js"
 19     ></script>
 20     <style>
 21       .content {
 22         margin: 30px auto;
 23         max-width:1100px;
 24       }
 25     </style>
 26   </head>
 27 
 28   <body>
 29     <div id="app">
 30       <div class="content">
 31         <Row>
 32           <i-col span=20>
 33             <i-form label-width="80" inline>
 34               <form-item label="本金：" >
 35                   <i-input type="text" v-model="ben" @on-blur='calc()'/>
 36               </form-item>
 37               <form-item label="利率：">
 38                   <i-input type="text" v-model="lx" @on-blur='calc()'/>
 39               </form-item>
 40               <form-item label="分期数：">
 41                   <i-input type="text" v-model="time" @on-blur='calc()'/>
 42               </form-item>
 43             </i-form>
 44           </i-col>
 45           <i-col span=4>
 46             <i-button type="primary" @click="calc()">计算</i-button>
 47           </i-col>
 48         </Row>
 49         <Alert>
 50           <Row style="text-align:center">
 51             <i-col span=6>总还款金额：{{all | zheng}}</i-col>
 52             <i-col span=6>总利息：{{all_lx | zheng}}</i-col>
 53             <i-col span=6>平均每月需还：{{all/time | zheng}}</i-col>
 54             <i-col span=6>平均每月利息：{{all_lx/time | zheng}}</i-col>
 55           </Row>
 56         </Alert>
 57         <i-table :loading="loading" :columns="columns1" :data="data1" size="small" border></i-table>
 58         
 59       </div>
 60     </div>
 61     <script type="text/javascript">
 62       new Vue({
 63         el: "#app",
 64         data: {
 65           loading: true,
 66           ben:120000,
 67           lx:0.000288,
 68           time: 24,
 69           all:0,
 70           all_lx:0,
 71           columns1:[
 72             {
 73               title: '还款日期',
 74               key: 'day'
 75             },
 76             {
 77               title: '平均每月需还',
 78               key: 'ping'
 79             },
 80             {
 81               title: '平均每月利息',
 82               key: 'ping_lx'
 83             },
 84             {
 85               title: '待还本金',
 86               key: 'ben'
 87             },
 88             {
 89               title: '还款金额',
 90               key: 'er'
 91             },
 92             {
 93               title: '本金',
 94               key: 'jin'
 95             },
 96             {
 97               title: '利息',
 98               key: 'xi'
 99             },
100             {
101               title: '当前月份天数',
102               key: 'num'
103             },
104           ],
105           data1:[
106             {
107               day:"",
108               ping:"",
109               ping_lx:"",
110               ben:"",
111               er:"",
112               jin:"",
113               xi:"",
114               num:"",
115             }
116           ],
117         },
118         methods: {
119           calc() {
120             let self = this;
121             let lx = this.lx; // 利率
122             let ben = this.ben; // 本金
123             let time = this.time; // 分期数
124             let huan = 0; // 一个月还多少
125             let yi = 0; // 总利息
126             let sheng = 0; // 未还本金
127             let all = 0; // 总金额
128             let dt = new Date();
129 
130             self.loading = true;
131             this.data1 = [];
132 
133             for (let i = 0; i < time; i++) {
134               dt.setMonth(dt.getMonth() + 1);
135               let y = dt.getFullYear();
136               let m =
137                 dt.getMonth() + 1 < 10
138                   ? "0" + (dt.getMonth() + 1)
139                   : dt.getMonth() + 1;
140               let d = dt.getDate()<10 ? "0"+ dt.getDate() : dt.getDate();
141               // 一期还款金额 = （本金/分期数）+（（本金-已经还款金额）*利率）
142               let mylx = (ben - (ben / time) * i) * lx * 30;
143               // let mylx = (ben - (ben / time) * i) * lx * new Date(y, m, 0).getDate();
144               huan = ben / time + mylx;
145               yi += mylx;
146               all += huan;
147               sheng = ben - (ben / time) * i;
148 
149               this.data1.push({day:y+"-"+m+"-"+d,ping:"",ping_lx:"",ben: parseInt(sheng),er: parseInt(huan),jin:parseInt(ben/time),xi: parseInt(mylx),num: (new Date(y, m, 0).getDate())})
150             
151             }
152             // 平均每月需还金额
153             for (let k = 0; k < this.data1.length; k++) {
154               this.data1[k].ping = parseInt(all/time);
155               this.data1[k].ping_lx = parseInt(yi/time);
156             }
157             this.all = parseInt(all);
158             this.all_lx = parseInt(yi);
159             setTimeout(() => {
160               self.loading = false;
161             },300);
162           }
163         },
164         created(){
165           this.calc();
166         },
167         filters: {
168           zheng(data) {
169             return parseInt(data) || 0;
170           }
171         }
172       });
173     </script>
174   </body>
175 </html>
View Code

------------------------------------------------------- 2019-03-19更新-----------------------------------------------------------

今天又看了一下，然后改了2个地方

1. 加入序号，知道什么时候还的是第几期

2. 加入可以选中当前行，对，它就是这个月的讨债仔

代码：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>zhengshize</title>
    <link
      rel="stylesheet"
      type="text/css"
      href="http://unpkg.com/iview/dist/styles/iview.css"
    />
    <script
      type="text/javascript"
      src="http://vuejs.org/js/vue.min.js"
    ></script>
    <script
      type="text/javascript"
      src="http://unpkg.com/iview/dist/iview.min.js"
    ></script>
    <style>
      .content {
        margin: 30px auto;
        max-width:1100px;
      }
    </style>
  </head>

  <body>
    <div id="app">
      <div class="content">
        <Row>
          <i-col span=20>
            <i-form label-width="80" inline>
              <form-item label="本金：" >
                  <i-input type="text" v-model="ben" @on-blur='calc()'/>
              </form-item>
              <form-item label="利率：">
                  <i-input type="text" v-model="lx" @on-blur='calc()'/>
              </form-item>
              <form-item label="分期数：">
                  <i-input type="text" v-model="time" @on-blur='calc()'/>
              </form-item>
            </i-form>
          </i-col>
          <i-col span=4>
            <i-button type="primary" @click="calc()">计算</i-button>
          </i-col>
        </Row>
        <Alert>
          <Row style="text-align:center">
            <i-col span=6>总还款金额：{{all | zheng}}</i-col>
            <i-col span=6>总利息：{{all_lx | zheng}}</i-col>
            <i-col span=6>平均每月需还：{{all/time | zheng}}</i-col>
            <i-col span=6>平均每月利息：{{all_lx/time | zheng}}</i-col>
          </Row>
        </Alert>
        <i-table :loading="loading" :columns="columns1" :data="data1" size="small" border highlight-row></i-table>
        
      </div>
    </div>
    <script type="text/javascript">
      new Vue({
        el: "#app",
        data: {
          loading: true,
          ben:120000,
          lx:0.000288,
          time: 24,
          all:0,
          all_lx:0,
          columns1:[
            {
              type:"index",
              68,
              title:"期数",
              align:'center'
            },
            {
              title: '还款日期',
              key: 'day'
            },
            {
              title: '平均每月需还',
              key: 'ping'
            },
            {
              title: '平均每月利息',
              key: 'ping_lx'
            },
            {
              title: '待还本金',
              key: 'ben'
            },
            {
              title: '还款金额',
              key: 'er'
            },
            {
              title: '本金',
              key: 'jin'
            },
            {
              title: '利息',
              key: 'xi'
            },
            {
              title: '当前月份天数',
              key: 'num'
            },
          ],
          data1:[
            {
              day:"",
              ping:"",
              ping_lx:"",
              ben:"",
              er:"",
              jin:"",
              xi:"",
              num:"",
            }
          ],
        },
        methods: {
          calc() {
            let self = this;
            let lx = this.lx; // 利率
            let ben = this.ben; // 本金
            let time = this.time; // 分期数
            let huan = 0; // 一个月还多少
            let yi = 0; // 总利息
            let sheng = 0; // 未还本金
            let all = 0; // 总金额
            let dt = new Date();

            self.loading = true;
            this.data1 = [];

            for (let i = 0; i < time; i++) {
              dt.setMonth(dt.getMonth() + 1);
              let y = dt.getFullYear();
              let m =
                dt.getMonth() + 1 < 10
                  ? "0" + (dt.getMonth() + 1)
                  : dt.getMonth() + 1;
              let d = dt.getDate()<10 ? "0"+ dt.getDate() : dt.getDate();
              // 一期还款金额 = （本金/分期数）+（（本金-已经还款金额）*利率）
              let mylx = (ben - (ben / time) * i) * lx * 30;
              // let mylx = (ben - (ben / time) * i) * lx * new Date(y, m, 0).getDate();
              huan = ben / time + mylx;
              yi += mylx;
              all += huan;
              sheng = ben - (ben / time) * i;

              this.data1.push({day:y+"-"+m+"-"+d,ping:"",ping_lx:"",ben: parseInt(sheng),er: parseInt(huan),jin:parseInt(ben/time),xi: parseInt(mylx),num: (new Date(y, m, 0).getDate())})
            
            }
            // 平均每月需还金额
            for (let k = 0; k < this.data1.length; k++) {
              this.data1[k].ping = parseInt(all/time);
              this.data1[k].ping_lx = parseInt(yi/time);
            }
            this.all = parseInt(all);
            this.all_lx = parseInt(yi);
            setTimeout(() => {
              self.loading = false;
            },300);
          }
        },
        created(){
          this.calc();
        },
        filters: {
          zheng(data) {
            return parseInt(data) || 0;
          }
        }
      });
    </script>
  </body>
</html>
View Code

------------------------------------------------------- 2019-04-21更新-----------------------------------------------------------

今天又又看了一下，然后改了1个地方

1. 增加“开始日期”

默认是当前日期，如果想从1号开始算起，就选1号，还款日期也会相应改变：

  1 <!DOCTYPE html>
  2 <html>
  3   <head>
  4     <meta charset="UTF-8" />
  5     <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  6     <title>zhengshize</title>
  7     <link
  8       rel="stylesheet"
  9       type="text/css"
 10       href="http://unpkg.com/iview/dist/styles/iview.css"
 11     />
 12     <script
 13       type="text/javascript"
 14       src="http://vuejs.org/js/vue.min.js"
 15     ></script>
 16     <script
 17       type="text/javascript"
 18       src="http://unpkg.com/iview/dist/iview.min.js"
 19     ></script>
 20     <style>
 21       .content {
 22         margin: 30px auto;
 23         max-width:1000px;
 24       }
 25       .input_width{
 26         width: 120px;
 27       }
 28     </style>
 29   </head>
 30 
 31   <body>
 32     <div id="app">
 33       <div class="content">
 34         <Row>
 35           <i-col span=21>
 36             <i-form label-width="80" inline>
 37               <form-item label="本金：" >
 38                   <i-input type="text" class="input_width" v-model="ben" @on-blur='calc()'/>
 39               </form-item>
 40               <form-item label="利率：">
 41                   <i-input type="text" class="input_width" v-model="lx" @on-blur='calc()'/>
 42               </form-item>
 43               <form-item label="分期数：">
 44                   <Input-Number type="text" class="input_width" v-model="time" @on-blur='calc()'/>
 45               </form-item>
 46               <form-item label="开始日期：">
 47                   <Date-Picker type="date" class="input_width" v-model="day" format="yyyy年MM月dd日" placeholder=""></Date-Picker>
 48               </form-item>
 49             </i-form>
 50           </i-col>
 51           <i-col span=3>
 52             <i-button type="primary" @click="calc()">计算</i-button>
 53           </i-col>
 54         </Row>
 55         <Alert>
 56           <Row style="text-align:center">
 57             <i-col span=6>总还款金额：<strong>{{all | zheng}}</strong></i-col>
 58             <i-col span=6>总利息：<strong>{{all_lx | zheng}}</strong></i-col>
 59             <i-col span=6>平均每月需还：<strong>{{all/time | zheng}}</strong></i-col>
 60             <i-col span=6>平均每月利息：<strong>{{all_lx/time | zheng}}</strong></i-col>
 61           </Row>
 62         </Alert>
 63         <i-table :loading="loading" :columns="columns1" :data="data1" size="small" border highlight-row></i-table>
 64       </div>
 65     </div>
 66     <script type="text/javascript">
 67       new Vue({
 68         el: "#app",
 69         data: {
 70           loading: true,
 71           day: "",
 72           ben:120000,
 73           lx:0.000288,
 74           time: 24,
 75           all:0,
 76           all_lx:0,
 77           columns1:[
 78             {
 79               type:"index",
 80               70,
 81               title:"期数",
 82               align:'center'
 83             },
 84             {
 85               title: '还款日期',
 86               100,
 87               key: 'day'
 88             },
 89             {
 90               title: '平均每月需还',
 91               key: 'ping'
 92             },
 93             {
 94               title: '平均每月利息',
 95               key: 'ping_lx'
 96             },
 97             {
 98               title: '待还本金',
 99               key: 'ben'
100             },
101             {
102               title: '还款金额',
103               key: 'er'
104             },
105             {
106               title: '本金',
107               key: 'jin'
108             },
109             {
110               title: '利息',
111               key: 'xi'
112             },
113             {
114               title: '当前月份天数',
115               110,
116               key: 'num'
117             },
118           ],
119           data1:[
120             {
121               day: "",
122               ping:"",
123               ping_lx:"",
124               ben:"",
125               er:"",
126               jin:"",
127               xi:"",
128               num:"",
129             }
130           ],
131         },
132         methods: {
133           calc() {
134             let self = this;
135             let lx = this.lx; // 利率
136             let ben = this.ben; // 本金
137             let time = this.time; // 分期数
138             let huan = 0; // 一个月还多少
139             let yi = 0; // 总利息
140             let sheng = 0; // 未还本金
141             let all = 0; // 总金额
142             let dt = this.day || new Date(); // 如果没有选择开始时间，默认当前日期
143 
144             self.loading = true;
145             this.data1 = [];
146 
147             for (let i = 0; i < time; i++) {
148               dt.setMonth(dt.getMonth() + 1);
149               let y = dt.getFullYear();
150               let m =
151                 dt.getMonth() + 1 < 10
152                   ? "0" + (dt.getMonth() + 1)
153                   : dt.getMonth() + 1;
154               let d = dt.getDate()<10 ? "0"+ dt.getDate() : dt.getDate();
155               // 一期还款金额 = （本金/分期数）+（（本金-已经还款金额）*利率）
156               let mylx = (ben - (ben / time) * i) * lx * 30;
157               // let mylx = (ben - (ben / time) * i) * lx * new Date(y, m, 0).getDate();
158               huan = ben / time + mylx;
159               yi += mylx;
160               all += huan;
161               sheng = ben - (ben / time) * i;
162 
163               this.data1.push({day:y+"-"+m+"-"+d,ping:"",ping_lx:"",ben: parseInt(sheng),er: parseInt(huan),jin:parseInt(ben/time),xi: parseInt(mylx),num: (new Date(y, m, 0).getDate())})
164             
165             }
166             // 平均每月需还金额
167             for (let k = 0; k < this.data1.length; k++) {
168               this.data1[k].ping = parseInt(all/time);
169               this.data1[k].ping_lx = parseInt(yi/time);
170             }
171             this.all = parseInt(all);
172             this.all_lx = parseInt(yi);
173             setTimeout(() => {
174               self.loading = false;
175             },300);
176           }
177         },
178         created(){
179           this.calc();
180           // 初始化显示当前日期
181           this.day = new Date();
182         },
183         mounted(){
184           
185         },
186         filters: {
187           zheng(data) {
188             return parseInt(data) || 0;
189           }
190         }
191       });
192     </script>
193   </body>
194 </html>
View Code
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原文地址：https://www.cnblogs.com/zhengshize/p/10548165.html