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 }else33 {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>
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