贝宝付款页面价格计算

Question

我想为我的贝宝付款选项创建价格计算。我使用JavaScript来做到这一点。但它不起作用。那么任何人都可以帮助我？以下是代码：

<script LANGUAGE="JavaScript"> 

function dp(price) { 
    string = "" + price; 
    number = string.length - string.indexOf('.'); 
    if (string.indexOf('.') == -1) return string + '.00'; 
    if (number == 1) return string + '00'; 
    if (number == 2) return string + '0'; 
    if (number > 3) return string.substring(0, string.length - number + 3); 
    return string; 
} 

function calculate() { 
    document.calcform.total1.value = dp((document.calcform.amount.value) * (document.calcform.quantity1.value)) 

} 
</script> 


<p>number of licenses (US$59.99 per license):</p> 
<p><form name="calcform" action="https://www.paypal.com/cgi-bin/webscr" method="post"> 
<input type="hidden" name="cmd" value="_xclick"> 
<input type="hidden" name="business" value="sample@paypal.com"> 
<input type="hidden" name="lc" value="MY"> 
<input type="hidden" name="item_number" value="abc"> 
<input type="text" name="quantity1" size="50" ONCHANGE="calculate()"> 
<input type="hidden" name="amount" ONCHANGE="calculate()" value="59.99"> 
<input type="hidden" name="item_name" value = "J-2011"> 

</form></p> 

enter to process payment 

Answer 1

在窗体标记内添加名为“total1”的隐藏框。

<input type="hidden" name="total1" value = "">