1、html页面 a.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>calculate</title>
</head>
<body>
<input type = "text" name="num1" id="num1">
<select name = "select" id="select">
<option value="+" >+</option>
<option value="-" >-</option>
<option value="*" >*</option>
<option value="/" >/</option>
</select>
<input type = "text" name="num2" id="num2" >
<input type = "submit" name = "submit" id="submit" value="=">
<input type = "text" name="result" id=‘result‘ placeholder="结果显示">
<script src="jquery.min.js"></script>
<script type="text/javascript">
$(‘#submit‘).click(function(){
var data={‘num1‘:$(‘#num1‘).val(),‘num2‘:$(‘#num2‘).val(),‘select‘:$("#select").val()};
$.ajax({
type:‘get‘,
url:‘a.php‘,
data:data,
dataType:‘json‘,
success:function(data){
$(‘#result‘).val(data);
},
error:function(error){
alert(‘no‘);
}
});
});
</script>
</body>
</html>
2、php页面 a.php
<?php
$data=$_GET;
$num1=$data[‘num1‘];
$num2=$data[‘num2‘];
$select=$data[‘select‘];
if(is_numeric($num1) && is_numeric($num2)){
switch($select){
case ‘+‘:
$result=$num1+$num2;break;
case ‘-‘:
$result=$num1-$num2;break;
case ‘*‘:
$result=$num1*$num2;break;
case ‘/‘:
$result=$num1/$num2;break;
}
}
echo json_encode($result);
原文：http://www.cnblogs.com/yolo-bean/p/7725852.html