webuploader drag and drop to upload a file or folder, how to get the path webkitRelativePath of the file. If you use < input type= "file" / >, you can get the path of the file inside, but if you drag and drop, you will see that the path inside is empty.

// 
        uploader.on("fileQueued", function( file ) {
            console.log(file);
            uploader.md5File( file )

           // 
           .progress(function(percentage) {
               console.log("Percentage:", percentage);
           })
            // 
            .then(function(val) {
                // console.log("md5 result:", val);
            });
        });

        uploader.on("uploadBeforeSend",function(object,data,headers){
            console.log(object);

            data.webkitRelativePath=object.file.source.source.webkitRelativePath?object.file.source.source.webkitRelativePath:"";
            console.log(data);
            data.fileId="";
        });

when I upload with the input control, both the fileQueued event trigger and the uploadBeforeSend event trigger print can get the path of the file, but when I use drag-and-drop upload, the path is empty.