智能计算脚本

作者：佚名来源：不详发布时间：2006/10/28 发布人：admin

要完成此效果需要三个步骤

第一步：把如下代码加入到<head>区域中

<-- Begin
var max_units = 200; // 最大值
var currency = "￥"; // 货币符号
function getDiscountPrice(units) {
if (units >= max_units) return 4; 
if (units >= 100) return 6;
if (units >= 50) return 8;
if (units >= 25) return 10;
if (units >= 10) return 13;
if (units >= 5) return 16;
if (units >= 2) return 17.50;
if (units == 1) return 19.95;
if (units <= 0) return 0;
}
function getNumberOfUnits() {
var units = document.calculator.units.value; 
return (units == "") ? 0 : units;
}
function showResult(result) {
// adjust the following line if result must popup somewhere else
document.calculator.respons.value = result;    
}
function formatMessage(units, unit_price) {
return units + " * " + currency + formatPrice(unit_price) + " = " + currency + formatPrice(units * unit_price);
}
// AltUnits (alternate units): add extra units to reach minimum for next discount price
function getAltUnits(units) {
var discount_price = getDiscountPrice(units);
if (units < max_units) do { units++ } while (discount_price == getDiscountPrice(units));
return units;
}
function findPrice() {
var units = getNumberOfUnits();
var unit_price = getDiscountPrice(units);
var alt_units = getAltUnits(units);
var alt_unit_price = getDiscountPrice(alt_units);
var result;
if ((units * unit_price) < (alt_units * alt_unit_price)) 
result = formatMessage(units, unit_price); 
else
result = formatMessage(alt_units, alt_unit_price);
showResult(result);
}
function formatPrice(value) {
var result= Math.floor(value) + ".";
var cents = 100 * (value-Math.floor(value)) + 0.5;
result += Math.floor(cents / 10);
result += Math.floor(cents % 10);
return result;
}
function filterNonNumeric(field) {
var result = new String();
var numbers = "0123456789";
var chars = field.value.split(""); // create array 
for (i = 0; i < chars.length; i++) {
if (numbers.indexOf(chars[i]) != -1) result += chars[i];
}
if (field.value != result) field.value = result;
}
//  End -->
</Script>

第二步：把如下代码加入到<body>区域中

<table border="1" cellspacing="0" cellpadding="3" width="300" align="center">
  <tr>
    <td>单个数量单位的价格</td>
    <td width=50 align=right>￥19.95</td>
</tr>
<tr>
    <td>2-4个数量单位的价格</td>
    <td width=50 align=right> ￥17.50</td>
</tr>
<tr>
    <td>5-9个数量单位的价格</td>
    <td width=50 align=right>￥16.00</td>
</tr>
<tr>
    <td>10-24个数量单位的价格</td>
    <td width=50 align=right> ￥13.00</td>
</tr>
<tr>
    <td>25-49个数量单位的价格</td>
    <td width=50 align=right>￥10.00</td>
</tr>
<tr>
    <td>50-99个数量单位的价格</td>
    <td width=50 align=right> ￥8.00</td>
</tr>
<tr>
    <td>100-199个数量单位的价格</td>
    <td width=50 align=right> ￥6.00</td>
</tr>
<tr>
    <td>大于200个数量单位的价格</td>
    <td width=50 align=right> ￥4.00</td>
</tr>
</table>
<br>
<form name=calculator>
  <div align="center">只需输入数量即可: 
    <input type=text value="1" name="units" onkeydown="findPrice()" onKeyUp="filterNonNumeric(this); findPrice()" onkeypress="findPrice()" size="4">
    <input type=text onfocus="this.blur()" name="respons" size="24" style="border:0; font-weight:bold">
  </div>
</form>

第三步：把“onLoad="findPrice()"”加在<body>标记里
例如：<body onLoad="findPrice()">

特别说明：如网页特效代码中有引用图片文件等，请自己下载到本地调试！

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