jquery 和 FormData 最简单图片异步上传

<script src="/scripts/jquery/jquery-3.1.1.min.js"></script>
    <script type="text/javascript">
        $(function () {
            var fileInfo = $('#file').prop('files')[0];
            var fm = new FormData();
            fd.append("xxxx", fileInfo);
            $.post("url", fm, function (rs) { }, "json");
        })
    </script>