Jquery Ajax POST方法不工作，返回未定义的值 - Jquery Ajax POST method is not working, return undefined value

Jquery Ajax POST method is not working, return undefined value

POST方法返回未定义的值，但GET方法工作正常。我甚至尝试了$.post(url, data, success);<lt；$.post更糟糕的是GET和POST无法工作。

<input type="submit" value="submit"  id="btnUpload">

$('#btnUpload').click(function(){       
$.ajax({  
    type: 'POST',  
    url: 'ajax.php',
    data: { 'action': 'scan_email' },
    success: function(response) {
        alert(response);
        }
    });

ajax.php

<?php echo $_POST['action'];?>

使用method而不是type:

代码：

<input type="submit" value="submit"  id="btnUpload">
$('#btnUpload').click(function(){       
    $.ajax({  
    method: 'POST',  
    url: 'ajax.php',
    data: { 'action': 'scan_email' },
    success: function(response) {
       alert(response);
    }
});

添加了jquery库

<input type="button" value="submit" id="btnUpload">
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){ 
    $('#btnUpload').on('click', function(){ 
        $.ajax({
                type: "POST",  
                url: "login.php",  
                data: { 'action':'scan_email'},
                success: function(theResponse) {
                    // Output from ajax.php
                    alert(theResponse); // comment this
                    }  
            });
    });
});                 
</script>