计算器

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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>计算器</title>
<script type="text/javascript">
function jia()
{
var num1=parseInt(document.form1.num1.value);
var num2=parseInt(document.form1.num2.value);
document.form1.num3.value=num1+num2;
}

function jian()
{
var num1=parseInt(document.form1.num1.value);
var num2=parseInt(document.form1.num2.value);
document.form1.num3.value=num1-num2;
}
function chen()
{
var num1=parseInt(document.form1.num1.value);
var num2=parseInt(document.form1.num2.value);
document.form1.num3.value=num1*num2;
}
function chu()
{
var num1=parseInt(document.form1.num1.value);
var num2=parseInt(document.form1.num2.value);
document.form1.num3.value=num1/num2;
}
</script>
</head>
<body>
<form name="form1" method="post" action="">
第一个数:<input type="text" name="num1" value=""><br><br>
第二个数:<input type="text" name="num2" value=""><br><br>
<input type="button" name="1" value="+" onclick="jia()">&nbsp;&nbsp;&nbsp;
<input type="button" name="2" value="-" onclick="jian()">&nbsp;&nbsp;&nbsp;
<input type="button" name="3" value="*" onclick="chen()">&nbsp;&nbsp;&nbsp;
<input type="button" name="4" value="/" onclick="chu()">&nbsp;&nbsp;&nbsp;<br><br>
结果是:<input type="text" name="num3" value="">
</form>
</body>
</html>