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我正在使用一个浏览器插件，它接收来自扫描仪的输入并返回一个 base64 编码的字符串。我正在尝试获取此字符串并将其用作表单帖子的内容。我不知所措。

var formElem = document.getElementById("fileUploadForm");
var imagedata;

Plugin.SelectedImagesCount = 1;
Plugin.SetSelectedImageIndex(0,0); // Set the 1st image as the first selected image.

Plugin.GetSelectedImagesSize(1); //jpeg
imagedata = Plugin.SaveSelectedImagesToBase64Binary();
//This is where I'd like to send the imagedata to the server

我试过搜索，但到目前为止我发现的唯一方法是构建自定义 http 来模拟表单提交。我想重用现有的文件上传表单。

<form id="fileUploadForm" method="POST" enctype="multipart/form-data">
    <!-- Scanning -->
    <select name="docType">
        <option>1</option>
        <option>2</option>
        <option>3</option>
    </select>
    <button onClick="ScanImage(); return false;">Scan</button>
    <!-- Uploading -->
    <input id="DocUploadInput" type="file" name="RemoteFile" />
    <button onClick="fileUpload(this.form,'/UploadDocument/'); return false;">Upload</button>
</form>
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