HTML打折计算价格

时间：2024-07-10 18:33:02
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

      <meta http-equiv="content-type" content="text/html; charset=UTF-8">

   <head>

     <title>打折后价格计算</title>

   <!--  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-->

       <script type="text/javascript">

     function calculator(){

         var prices=document.getElementById("price");

         var discounts=document.getElementById("number");

         var pay;

         var select=document.getElementById("payfunction");

         if((prices.value>=0&&!isNaN(prices.value))&&(discounts.value>=0&&!isNaN(discounts.value))&&prices.value!=""&&discounts.value!="")

         {

             pay=prices.value*discounts.value;

             switch(parseInt(select.value)){

             case 1:pay=pay*0.5; break;

             case 2:pay=pay*0.8; break;

             case 3:pay=pay*0.6;    break;

             }

             document.getElementById("result").value=pay;

             alert("恭喜你，交易成功！");

         }else

         {

             prices.focus();

             prices.select();

             alert("请输入正确的价格和数量(也不能为空)！");

         }

     }

     </script>

   </head>

   <!--  定义界面格式，设置下拉表，设置计算价格事件-->

 <body>

     <center>

     <form name="discount" action="result.jsp" method="post">

          竞拍价格：<input type="text" id="price" style="width: 150px"/><br>

          购买数量：<input type="text" id="number" style="width: 150px"/><br>

          支付方式：<select id="payfunction" style="width: 150px">

          <option value="1">网银支付-打5折</option>

         <option value="2">支付宝支付-打8折</option>

         <option value="3" selected="true">Q币支付-打6折</option>

          </select><br>

          预计总价：<input type="text" id="result" style="width: 150px"><br>

          <input type="button" id="allresult"  value="计算总价" onclick="calculator()" />

     </form>

      </center>

   </body>

 </html>

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