code: function(_form,_param){
              if (!_param) return;
              var _arr = [];
              _u._$loop(_param,function(_value,_key){
                  _arr.push('<input type="hidden" name="'+_key+'" value="'+_value+'">');
              });
              _form.insertAdjacentHTML('afterBegin',_arr.join(''));
          }
docs: init param