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<html>
<head>
<title>简易Servlet计算器</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function calc(form){
with(form){
if(firstNum.value == "" || secendNum.value == ""){
alert("请输入数字！");
return false;
}
if(isNaN(firstNum.value) || isNaN(secendNum.value)){
alert("数字格式错误！");
return false;
}
if(operator.value == "-1"){
alert("请选择运算符！");
return false;
}
}
}
</script>
</head>
<body>
<form action="CalculateServlet" method="post" onsubmit="return calc(this);">
<table align="center" border="0">
<tr>
<th>简易Servlet计算器</th>
</tr>
<tr>
<td>
<input type="text" name="firstNum">
<select name="operator">
<option value="-1">运算符</option>
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" name="secendNum">
<input type="submit" value="计算">
</td>
</tr>
</table>
</form>
</body>
</html>
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原文地址：http://www.cnblogs.com/ganjun/p/5038942.html
