<html>
<head>
<title>我的计算器</title>
<script language="javascript">
function check(){
//js的内容
var num1var=document.getElenmentById("num1").value;
var num2var-document.getElenmentById("num2").value;
if(isNaN(num1val) || isNaN(num2val)){
window.alert("num1和num2必须是数");
//如果返回false就不提交.
return false;
}}
</script>
<head>
<h1>我的计算器</h1>
<form action="CalProcess.php" method="post">
num1:<input type="text" name="num1"></br>
num2:<input type="text" name="num2"></br>
oper:
<select name="oper">
<option value="+">+</option>
<option value="-">-</option>
<option value="*" >*</option>
<option value="/">/</option>
<input type="submit" value="提交">
</form>
</html>