xiaoafei1991

导航

锋利的js之妈妈再也不用担心我找错钱了

用js实现收银功能。

 1 <!DOCTYPE html>
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4     <title>xx超市收银系统</title>
 5     <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
 6     </script>
 7     <script type="text/javascript">
 8         $(function () {
 9             $('form').submit(function () {
10                 var payable = Number($('#txtPayable').val());//应付
11                 var payment = Number($('#txtPayment').val());//实付
12                 if (payable === payment) {
13                     $('#tdPocket').text(0);
14                 } else if (payable > payment) {
15                     $('#tdPocket').text('您还需再支付' + (payable*10 - payment*10)/10 + '元!');
16                 } else {//需要找零
17                     var yuan = [100, 50, 20, 10, 5, 1];
18                     var jiao = [5, 2, 1];
19                     var msg = '';
20                     var payableYuan = parseInt(payable);
21                     var paymentYuan = parseInt(payment);
22                     var pocketYuan = paymentYuan - payableYuan;//找零元
23                     var surplus = pocketYuan;
24                     $(yuan).each(function() {
25                             if (surplus >= this) {
26                                 var count = parseInt(surplus / this);
27                                 msg += this + '' + count + '';
28                                 surplus -= count * this;
29                             }
30                     });
31                     //在js中10.2-10.1=0.09999999999999964,防止小数误差,需要*10
32                     var pocketJiao = parseInt(((payment * 10) - (payable * 10)) - (pocketYuan * 10));//找零角
33                     surplus = pocketJiao;
34                     $(jiao).each(function () {
35                         if (surplus >= this) {
36                             var count = parseInt(surplus / this);
37                             msg += this + '' + count + '';
38                             surplus -= count * this;
39                         }
40                     });
41                     msg += '' + pocketYuan + '.' + pocketJiao + '';
42                     $('#tdPocket').text(msg);
43                 }
44                 return false;
45             });
46         });
47     </script>
48     <style type="text/css">
49         table {
50             border: 1px solid #0000cd;
51         }
52 
53         td {
54             padding: 2px;
55         }
56 
57         .right {
58             text-align: right;
59         } 
60 
61         .left {
62             text-align: left;
63             width: 50px;
64         }
65 
66         .center {
67             text-align: center;
68         }
69     </style>
70 </head>
71 <body>
72     <form>
73         <table border="1" cellpadding="0" cellspacing="0">
74             <tr>
75                 <td class="right">应付:</td>
76                 <td class="left"><input type="number" id="txtPayable" min="0" step="any" /></td>
77             </tr>
78             <tr>
79                 <td class="right">实付:</td>
80                 <td class="left"><input type="number" id="txtPayment" min="0" step="any" /></td>
81             </tr>
82             <tr>
83                 <td class="right">找零:</td>
84                 <td class="left" id="tdPocket"></td>
85             </tr>
86             <tr>
87                 <td colspan="2" class="center"><input type="submit" value="计算" id="btnCalc" /></td>
88             </tr>
89         </table>
90     </form>
91 </body>
92 </html>

效果

样式有点丑,没时间去调。

找零时,从最大面值的钱开始找,找零5.1,找一张5元,而不是找5张1元。

只考现行的第五套人民币面值,不考虑分币,目前几乎不怎么流通分币了。

重点是算出零钱该找出x张y面值的钱,由于js对于小数计算有误差,需要先将小数换算成整数,再转成小数.

js中10.2-10.1结果是0.09999999999999964;

要想得到结果0.1,笨一点的办法(10.2*10-10.1*10)/10=0.1;

有了这款神器,是不是再也不用担心找错钱了?我还是比较喜欢收银员给我多找点钱:)

 

如果觉得对你有帮助,请点个赞,谢谢!

不足与错误之处,敬请批评指正!

posted on 2015-05-31 13:28  xiaoafei1991  阅读(570)  评论(0编辑  收藏  举报