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<script language="javascript">
var num=document.form1.num1.value;
var count=document.form1.num2.value;
var result=document.form1.num3.value;
if(count=="")
{
alert("请输入个数");
}
//document.write(result);
document.form1.num3.value=parseFloat(num)*parseFloat(count);
</script>
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<form id="form1" name="form1">
<input type="text" id="num1" name="num1" value="12">
<input type="text" id="num2" name="num2" value="2">
<input type="text" id="num3" name="num3">
</form>
<script language="javascript">
var num=document.form1.num1.value;
var count=document.form1.num2.value;
var result=document.form1.num3.value;
if(count=="")
{
alert("请输入个数");
}
//document.write(result);
document.form1.num3.value=parseFloat(num)*parseFloat(count);
</script>
</body>
</html>