php实现post的jsonp

后台代码：

function ajax()
{
    header('Access-Control-Allow-Origin:*');
    $data['test'] = "this is test..";
    $data['aaa'] = $_POST['aaa'];
    $callback = $_POST['callback'];
    echo $callback.'('.json_encode($data).')';
    exit;
}

前端代码：

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>test</title>
<!-- <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script> -->
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
</head>
<body>
</body>
<script type="text/javascript">
    $.ajax({
        type : "POST",
        async:false,
        url : "http://biz.live.com/caller?c=alipay&a=ajax",
        data: {aaa: 'ttaaatatata', callback:'callback'},
        success : function(json){
            alert(json);
        },
        error:function(){
            alert('fail');
        }
    });
</script>
</html>

php实现post的jsonp

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