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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文件</title>
<script type="text/javascript">
function comp(){
var num = document.getElementById("num").value;
var discount = document.getElementById("discount").value;
var price = document.getElementById("price").value;
var count = num * price * discount/10;
document.getElementById("count").value=count;
}
</script>
</head>
<body>
数量<input type="text" id="num" onpropertychange="comp();" oninput="comp();"/>件<br/>
折扣<input type="text" id="discount" onpropertychange="comp();" oninput="comp();"/>折<br/>
价格<input type="text" id="price" onpropertychange="comp();" oninput="comp();"/>元<br/>
总价<input type="text" id="count" readonly="readonly" oninput="comp();"/>元<br/>
<input type="button" value="计算" onclick="comp();"/>
</body>
</html>