HTML打折计算价格实现原理与脚本代码

<!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"/>

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

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>

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

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

</form>

</center>

</body>

</html>

 

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