code: function(_form){
              var _result = [];
              _u._$reverseEach(
                  _form.getElementsByTagName('input'),
                  function(_input){
                      if (_input.type!='file'){
                          return;
                      }
                      // remove file without name
                      if (!_input.name){
                          _input.parentNode.removeChild(_input);
                          return;
                      }
                      // for multiple file per-input
                      if (_input.files.length>1){
                          _u._$forEach(_input.files,function(_file){
                              _result.push({name:_input.name,file:_file});
                          });
                          _input.parentNode.removeChild(_input);
                      }
                  }
              );
              return _result.length>0?_result:null;
          }
docs: split input.file for multiple files