是否可以在一个AJAX请求中上传文本和图像？

Question

到目前为止，我有这个表格

<form id = "newpost" enctype="multipart/form-data">
    <input type = "text" id = "post_title"  name = "post_title" placeholder = "Post Title"/>
    <textarea id = "post_txt" name = "post_txt" placeholder = "Post Text"></textarea>
    <input type = "file" id = "file_upload" name = "file_upload"/></br>
    <input type = "submit" value = "Post" id = "newpost_btn" name = "newpost_btn"/>
</form>

和这个脚本

var serializedData = $form.serialize();
$.ajax({
    url: "submit.php",
    type: "post",
    data: serializedData
});

但上述脚本仅适用于文本。那么有没有办法在一个请求中传递文本和图像？