如何使用jQuery获取Ajax请求数据？

I have an Ajax request:

我有一个Ajax请求:

$.ajax({ url: "MyPage.aspx", 
    data: params,
    success: function(data) {
        // Check results                
        $('#testp').append(data.message);
        enableForm();
    },
    error: function() {
        alert('Unable to load the permissions for this user level.\n\nYour login may have expired.');
        enableForm();
    },
    dataType: "json"
});
$.ajax(