code: function(_list){
              var _result = 0;
              _u._$forEach(
                  _list,function(_size){
                      if (!_size) return;
                      if (!_result){
                          _result = _size;
                      }else{
                          _result = Math.min(_result,_size);
                      }
                  }
              );
              return _result;
          }
docs: get min value but not zero