1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2 <html>
3
4 <meta http-equiv="content-type" content="text/html; charset=UTF-8">
5
6 <head>
7
8 <title>打折后价格计算</title>
9
10 <!-- 设置计算价格事件函数，取不同下拉打折数，计算结果送入文字框-->
11
12 <script type="text/javascript">
13
14 function calculator(){
15 var prices=document.getElementById("price");
16 var discounts=document.getElementById("number");
17 var pay;
18 var select=document.getElementById("payfunction");
19 if((prices.value>=0&&!isNaN(prices.value))&&(discounts.value>=0&&!isNaN(discounts.value))&&prices.value!=""&&discounts.value!="")
20 {
21 pay=prices.value*discounts.value;
22
23 switch(parseInt(select.value)){
24 case 1:pay=pay*0.5; break;
25 case 2:pay=pay*0.8; break;
26 case 3:pay=pay*0.6; break;
27 }
28
29 document.getElementById("result").value=pay;
30 alert("恭喜你，交易成功！");
31
32 }else
33 {
34 prices.focus();
35 prices.select();
36 alert("请输入正确的价格和数量(也不能为空)！");
37 }
38
39 }
40
41
42 </script>
43
44
45 </head>
46
47 <!-- 定义界面格式，设置下拉表，设置计算价格事件-->
48
49 <body>
50 <center>
51 <form name="discount" action="result.jsp" method="post">
52 竞拍价格：<input type="text" id="price" style="width: 150px"/><br>
53
54 购买数量：<input type="text" id="number" style="width: 150px"/><br>
55
56 支付方式：<select id="payfunction" style="width: 150px">
57 <option value="1">网银支付-打5折</option>
58 <option value="2">支付宝支付-打8折</option>
59 <option value="3" selected="true">Q币支付-打6折</option>
60 </select><br>
61
62 预计总价：<input type="text" id="result" style="width: 150px"><br>
63
64 <input type="button" id="allresult" value="计算总价" onclick="calculator()" />
65 </form>
66 </center>
67
68 </body>
69 </html>
