html5 / Javascript - 如何上传多个文件夹？

Question

HTML CODE

<input type="file" id="FileUpload" onchange="selectFolder(event)" webkitdirectory mozdirectory msdirectory odirectory directory multiple />

或

<input type="file" id="file1" name="abc" onchange="Filter(); upload.disabled = false;" webkitdirectory mozdirectory msdirectory odirectory directory AllowMultiple="true"/>

multiple和webkitdirectory未按预期工作