(function ($) {
  jQuery.fn.reverse = Array.prototype.reverse;

  var
    // auxiliar functions
    aux = {
      setup: function ($wrapper, $items, opts) {

        // set the wrappers position to relative
        $wrapper.css('position', 'relative');

        // save the items position
        aux.saveInitialPosition($items);

        // set the items to absolute and assign top & left
        $items.each(function (i) {
          var $item = $(this);

          $item.css({
            position: 'absolute',
            left: $item.data('left'),
            top: $item.data('top')
          });
        });

        // check how many items we have per row
        var rowCount = Math.floor($wrapper.width() / $items.width()),
          // number of items to show is rowCount * n rows
          shown = rowCount * opts.rows,
          // total number of rows
          totalRows = Math.ceil($items.length / rowCount);

        // save this values for later
        var config = {};
        config.currentRow = 1;
        config.totalRows = totalRows;
        config.rowCount = rowCount;
        config.shownItems = shown;
        $wrapper.data('config', config);

        // show n rowns
        $wrapper.children(':gt(' + (shown - 1) + ')').hide();

        // assign row classes to the items
        $items.each(function (i) {
          var $item = $(this),
            row = Math.ceil((i + 1) / rowCount);

          $item.addClass('tj_row_' + row);
        });

        nav.setup($wrapper, $items, opts);

      },
      saveInitialPosition: function ($items) {
        $items.each(function (i) {
          var $item = $(this);

          $item.data({
            left: $item.position().left + 'px',
            top: $item.position().top+ 'px'
          });
        });
      }
    },
    // navigation types
    nav = {
      setup: function ($wrapper, $items, opts) {
        nav[opts.type.mode].setup($wrapper, $items, opts);
      },
      def: {
        setup: function ($wrapper, $items, opts) {
          var config = $wrapper.data('config');

          $items.each(function (i) {
            var $item = $(this),
              row = Math.ceil((i + 1) / config.rowCount),
              t,
              f = row % opts.rows;

            if (f === 1) {
              t = '0px';
            } else if (f === 0) {
              t = (opts.rows - 1) * $items.height() + 'px';
            } else {
              t = (f - 1) * $items.height() + 'px';
            }

            $item.css({ top: t });
          });
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          // var currentRows = '', nextRows = '';

          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }

          // 使用数组来存储选择器
          var currentRows = [];
          var nextRows = [];

          // 获取当前行的起始位置
          var currentRowStart = config.currentRow;

          for (var i = 0; i < opts.rows; ++i) {
            // 生成当前行选择器并存储到数组中
            currentRows.push('.tj_row_' + (currentRowStart + i));

            // 根据方向计算下一行的选择器并存储到数组中
            if (dir === 1) {
              nextRows.push('.tj_row_' + (currentRowStart + opts.rows + i));
            } else {
              nextRows.push('.tj_row_' + (currentRowStart - 1 - i));
            }
          }

          // 通过 join(',') 将数组中的选择器连接成字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');


          $wrapper.children(currentRows).hide();
          $wrapper.children(nextRows).show();

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('anim', false);

          $wrapper.data('config', config);
        }
      },
      fade: {
        setup: function ($wrapper, $items, opts) {
          // same like def mode
          nav['def'].setup($wrapper, $items, opts);
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }


          
          // var currentRows = '', nextRows = '';

          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }

          var currentRows = [];
          var nextRows = [];

          for (var i = 0; i < opts.rows; ++i) {
            currentRows.push('.tj_row_' + (config.currentRow + i));

            if (dir === 1) {
              nextRows.push('.tj_row_' + (config.currentRow + opts.rows + i));
            } else {
              nextRows.push('.tj_row_' + (config.currentRow - 1 - i));
            }
          }

          // 生成最终的选择器字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');

          $wrapper.children(currentRows).fadeOut(opts.type.speed, opts.type.easing);

          var $nextRowElements = $wrapper.children(nextRows),

            totalNextRows = $nextRowElements.length,
            cnt = 0;

          $nextRowElements.fadeIn(opts.type.speed, opts.type.easing, function () {
            ++cnt;
            if (cnt === totalNextRows) {
              $wrapper.data('anim', false);
            }
          });

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('config', config);
        }
      },
      seqfade: {
        setup: function ($wrapper, $items, opts) {
          // same like def mode
          nav['def'].setup($wrapper, $items, opts);
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          // var currentRows = '', nextRows = '';
          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }

          // 使用数组来收集结果
          var currentRows = [];
          var nextRows = [];

          // 获取当前行和下一行的起始位置
          var currentStart = config.currentRow;
          var nextStartOffset = opts.rows;

          for (var i = 0; i < opts.rows; ++i) {
            // 将当前行的选择器加入数组
            currentRows.push('.tj_row_' + (currentStart + i));

            // 根据方向计算下一行的选择器并加入数组
            if (dir === 1) {
              nextRows.push('.tj_row_' + (currentStart + nextStartOffset + i));
            } else {
              nextRows.push('.tj_row_' + (currentStart - 1 - i));
            }
          }

          // 通过 join(',') 将数组中的选择器连接成字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');

          var seq_t = opts.type.factor;

          var $currentRowElements;
          (dir === 1)
            ? $currentRowElements = $wrapper.children(currentRows)
            : $currentRowElements = $wrapper.children(currentRows).reverse();

          $currentRowElements.each(function (i) {
            var $el = $(this);
            setTimeout(function () {
              $el.fadeOut(opts.type.speed, opts.type.easing)
            }, seq_t + i * seq_t);
          });

          var $nextRowElements;
          (dir === 1)
            ? $nextRowElements = $wrapper.children(nextRows)
            : $nextRowElements = $wrapper.children(nextRows).reverse();

          var total_elems = $nextRowElements.length,
            cnt = 0;

          $nextRowElements.each(function (i) {
            var $el = $(this);
            setTimeout(function () {
              $el.fadeIn(opts.type.speed, opts.type.easing, function () {
                ++cnt;
                if (cnt === total_elems) {
                  $wrapper.data('anim', false);
                }
              })
            }, (seq_t * 2) + i * seq_t);
          });

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('config', config);
        }
      },
      updown: {
        setup: function ($wrapper, $items, opts) {
          var config = $wrapper.data('config');

          $wrapper.children(':gt(' + (config.shownItems - 1) + ')').css('opacity', 0);

          $items.each(function (i) {
            var $item = $(this),
              row = Math.ceil((i + 1) / config.rowCount),
              t = $item.position().top,
              f = row % opts.rows;

            if (row > opts.rows) {
              t = (opts.rows * $items.height());
            }

            $item.css({ top: t + 'px' });
          });
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - 1 <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          var movingRows = '';
          for (var i = 0; i <= opts.rows; ++i) {
            if (i > 0) movingRows += ','; // 添加逗号作为分隔符
            movingRows += '.tj_row_' + (dir === 1 ? (config.currentRow + i) : (config.currentRow + (i - 1)));
          }

          var $elements;

          (dir === 1)
            ? $elements = $wrapper.children(movingRows)
            : $elements = $wrapper.children(movingRows).reverse();

          var total_elems = $elements.length,
            cnt = 0;

          $elements.each(function (i) {
            var $el = $(this),
              row = $el.attr('class'),
              animParam = {},

              currentRow = config.currentRow;

            // if first row fade out
            // if last row fade in
            // for all the rows move them up / down
            if (dir === 1) {
              if (row === 'tj_row_' + (currentRow)) {
                animParam.opacity = 0;
              }
              else if (row === 'tj_row_' + (currentRow + opts.rows)) {
                animParam.opacity = 1;
              }
            }
            else {
              if (row === 'tj_row_' + (currentRow - 1)) {
                animParam.opacity = 1;
              }
              else if (row === 'tj_row_' + (currentRow + opts.rows - 1)) {
                animParam.opacity = 0;
              }
            }

            $el.show();

            (dir === 1)
              ? animParam.top = $el.position().top - $el.height() + 'px'
              : animParam.top = $el.position().top + $el.height() + 'px'

            $el.stop().animate(animParam, opts.type.speed, opts.type.easing, function () {
              if (parseInt(animParam.top) < 0 || parseInt(animParam.top) > $el.height() * (opts.rows - 1))
                $el.hide();

              ++cnt;
              if (cnt === total_elems) {
                $wrapper.data('anim', false);
              }
            });
          });

          (dir === 1) ? config.currentRow += 1 : config.currentRow -= 1;

          $wrapper.data('config', config);
        }
      },
      sequpdown: {
        setup: function ($wrapper, $items, opts) {
          // same like updown mode
          nav['updown'].setup($wrapper, $items, opts);
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - 1 <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          var movingRows = '';

          for (var i = 0; i <= opts.rows; ++i) {
            if (i > 0) movingRows += ','; // 添加逗号作为分隔符
            movingRows += '.tj_row_' + (dir === 1 ? (config.currentRow + i) : (config.currentRow + (i - 1)));
          }

          var seq_t = opts.type.factor,
            $elements;

          var dircond = 1;
          if (opts.type.reverse) dircond = -1;
          (dir === dircond)
            ? $elements = $wrapper.children(movingRows)
            : $elements = $wrapper.children(movingRows).reverse();

          var total_elems = $elements.length,
            cnt = 0;

          $elements.each(function (i) {
            var $el = $(this),
              row = $el.attr('class'),
              animParam = {},

              currentRow = config.currentRow;

            setTimeout(function () {
              // if first row fade out
              // if last row fade in
              // for all the rows move them up / down
              if (dir === 1) {
                if (row === 'tj_row_' + (currentRow)) {
                  animParam.opacity = 0;
                }
                else if (row === 'tj_row_' + (currentRow + opts.rows)) {
                  animParam.opacity = 1;
                }
              }
              else {
                if (row === 'tj_row_' + (currentRow - 1)) {
                  animParam.opacity = 1;
                }
                else if (row === 'tj_row_' + (currentRow + opts.rows - 1)) {
                  animParam.opacity = 0;
                }
              }

              $el.show();

              (dir === 1)
                ? animParam.top = $el.position().top - $el.height() + 'px'
                : animParam.top = $el.position().top + $el.height() + 'px'

              $el.stop().animate(animParam, opts.type.speed, opts.type.easing, function () {
                if (parseInt(animParam.top) < 0 || parseInt(animParam.top) > $el.height() * (opts.rows - 1))
                  $el.hide();

                ++cnt;
                if (cnt === total_elems) {
                  $wrapper.data('anim', false);
                }
              });
            }, seq_t + i * seq_t);
          });

          (dir === 1) ? config.currentRow += 1 : config.currentRow -= 1;

          $wrapper.data('config', config);
        }
      },
      showhide: {
        setup: function ($wrapper, $items, opts) {
          var config = $wrapper.data('config');

          $items.each(function (i) {
            var $item = $(this),
              row = Math.ceil((i + 1) / config.rowCount),
              t,
              f = row % opts.rows;

            if (f === 1) {
              t = '0px';
            } else if (f === 0) {
              t = (opts.rows - 1) * $items.height() + 'px';
            } else {
              t = (f - 1) * $items.height() + 'px';
            }

            $item.css({ top: t });
          });
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          // var currentRows = '', nextRows = '';

          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }

          // 使用数组来存储选择器
          var currentRows = [];
          var nextRows = [];

          // 获取当前行的起始位置
          var currentRowStart = config.currentRow;

          for (var i = 0; i < opts.rows; ++i) {
            // 生成当前行选择器并存储到数组中
            currentRows.push('.tj_row_' + (currentRowStart + i));

            // 根据方向计算下一行的选择器并存储到数组中
            if (dir === 1) {
              nextRows.push('.tj_row_' + (currentRowStart + opts.rows + i));
            } else {
              nextRows.push('.tj_row_' + (currentRowStart - 1 - i));
            }
          }

          // 通过 join(',') 将数组中的选择器连接成字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');


          $wrapper.children(currentRows).hide(opts.type.speed, opts.type.easing);

          var $nextRowElements = $wrapper.children(nextRows),
            totalNextRows = $nextRowElements.length,
            cnt = 0;

          $nextRowElements.show(opts.type.speed, opts.type.easing, function () {
            ++cnt;
            if (cnt === totalNextRows) {
              $wrapper.data('anim', false);
            }
          });

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('config', config);
        }
      },
      disperse: {
        setup: function ($wrapper, $items, opts) {
          var config = $wrapper.data('config');

          $items.each(function (i) {
            var $item = $(this),
              row = Math.ceil((i + 1) / config.rowCount),
              t,
              f = row % opts.rows;

            if (f === 1) {
              t = '0px';
            } else if (f === 0) {
              t = (opts.rows - 1) * $items.height() + 'px';
            } else {
              t = (f - 1) * $items.height() + 'px';
            }

            $item.css({ top: t }).data('top', t);
          });
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          // var currentRows = '', nextRows = '';
          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }


          // 使用数组来存储选择器
          var currentRows = [];
          var nextRows = [];

          // 获取当前行的起始位置
          var currentRowStart = config.currentRow;

          for (var i = 0; i < opts.rows; ++i) {
            // 生成当前行选择器并存储到数组中
            currentRows.push('.tj_row_' + (currentRowStart + i));

            // 根据方向计算下一行的选择器并存储到数组中
            if (dir === 1) {
              nextRows.push('.tj_row_' + (currentRowStart + opts.rows + i));
            } else {
              nextRows.push('.tj_row_' + (currentRowStart - 1 - i));
            }
          }

          // 通过 join(',') 将数组中的选择器连接成字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');


          $wrapper.children(currentRows).each(function (i) {
            var $el = $(this);
            $el.stop().animate({
              left: $el.position().left + Math.floor(Math.random() * 101) - 50 + 'px',
              top: $el.position().top + Math.floor(Math.random() * 101) - 50 + 'px',
              opacity: 0
            }, opts.type.speed, opts.type.easing, function () {
              $el.css({
                left: $el.data('left'),
                top: $el.data('top')
              }).hide();
            });
          });

          var $nextRowElements = $wrapper.children(nextRows);
          total_elems = $nextRowElements.length,
            cnt = 0;

          $nextRowElements.each(function (i) {
            var $el = $(this);

            $el.css({
              left: parseInt($el.data('left')) + Math.floor(Math.random() * 301) - 150 + 'px',
              top: parseInt($el.data('top')) + Math.floor(Math.random() * 301) - 150 + 'px',
              opacity: 0
            })
              .show()
              .animate({
                left: $el.data('left'),
                top: $el.data('top'),
                opacity: 1
              }, opts.type.speed, opts.type.easing, function () {
                ++cnt;
                if (cnt === total_elems) {
                  $wrapper.data('anim', false);
                }
              });
          });

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('config', config);
        }
      },
      rows: {
        setup: function ($wrapper, $items, opts) {
          // same like def mode
          nav['def'].setup($wrapper, $items, opts);
        },
        pagination: function ($wrapper, dir, opts) {
          var config = $wrapper.data('config');

          if ((dir === 1 && config.currentRow + opts.rows > config.totalRows) ||
            (dir === -1 && config.currentRow - opts.rows <= 0)
          ) {
            $wrapper.data('anim', false);
            return false;
          }

          // var currentRows = '', nextRows = '';
          // for (var i = 0; i < opts.rows; ++i) {
          //   currentRows += '.tj_row_' + (config.currentRow + i) + ',';

          //   (dir === 1)
          //     ? nextRows += '.tj_row_' + (config.currentRow + opts.rows + i) + ','
          //     : nextRows += '.tj_row_' + (config.currentRow - 1 - i) + ',';
          // }

          // 使用数组来存储选择器
          var currentRows = [];
          var nextRows = [];

          // 获取当前行的起始位置
          var currentRowStart = config.currentRow;

          for (var i = 0; i < opts.rows; ++i) {
            // 生成当前行选择器并存储到数组中
            currentRows.push('.tj_row_' + (currentRowStart + i));

            // 根据方向计算下一行的选择器并存储到数组中
            if (dir === 1) {
              nextRows.push('.tj_row_' + (currentRowStart + opts.rows + i));
            } else {
              nextRows.push('.tj_row_' + (currentRowStart - 1 - i));
            }
          }

          // 通过 join(',') 将数组中的选择器连接成字符串
          currentRows = currentRows.join(',');
          nextRows = nextRows.join(',');


          $wrapper.children(currentRows).each(function (i) {
            var $el = $(this),
              rownmb = $el.attr('class').match(/tj_row_(\d+)/)[1],
              diff;

            if (rownmb % 2 === 0) {
              diff = opts.type.factor;
            }
            else {
              diff = -opts.type.factor;
            }

            $el.stop().animate({
              left: $el.position().left + diff + 'px',
              opacity: 0
            }, opts.type.speed, opts.type.easing, function () {
              $el.css({
                left: $el.data('left')
              }).hide();
            });
          });

          var $nextRowElements = $wrapper.children(nextRows);
          total_elems = $nextRowElements.length,
            cnt = 0;

          $nextRowElements.each(function (i) {
            var $el = $(this),
              rownmb = $el.attr('class').match(/tj_row_(\d+)/)[1],
              diff;

            if (rownmb % 2 === 0) {
              diff = opts.type.factor;
            }
            else {
              diff = -opts.type.factor;
            }

            $el.css({
              left: parseInt($el.data('left')) + diff + 'px',
              opacity: 0
            })
              .show()
              .animate({
                left: $el.data('left'),
                opacity: 1
              }, opts.type.speed, opts.type.easing, function () {
                ++cnt;
                if (cnt === total_elems) {
                  $wrapper.data('anim', false);
                }
              });
          });

          (dir === 1) ? config.currentRow += opts.rows : config.currentRow -= opts.rows;

          $wrapper.data('config', config);
        }
      }
    },
    methods = {
      init: function (options) {

        if (this.length) {

          var settings = {
            rows: 2,
            navL: '#tj_prev',
            navR: '#tj_next',
            type: {
              mode: 'def', 		// use def | fade | seqfade | updown | sequpdown | showhide | disperse | rows
              speed: 500,			// for fade, seqfade, updown, sequpdown, showhide, disperse, rows
              easing: 'jswing',		// for fade, seqfade, updown, sequpdown, showhide, disperse, rows	
              factor: 50,			// for seqfade, sequpdown, rows
              reverse: false			// for sequpdown
            }
          };

          return this.each(function () {

            // if options exist, lets merge them with our default settings
            if (options) {
              $.extend(settings, options);
            }

            var $el = $(this).css('visibility', 'hidden'),
              // the ul
              $wrapper = $el.find('ul.tj_gallery'),
              // the items
              $thumbs = $wrapper.children('li'),
              total = $thumbs.length,
              // the navigation elements
              $p_nav = $(settings.navL),
              $n_nav = $(settings.navR);

            // save current row for later (first visible row)
            //config.currentRow	= 1;

            // flag to control animation progress
            $wrapper.data('anim', false);

            // preload thumbs
            var loaded = 0;
            $thumbs.find('img').each(function (i) {
              var $img = $(this);
              $('<img/>').on('load', function () {
                ++loaded;
                if (loaded === total) {
                  // setup
                  aux.setup($wrapper, $thumbs, settings);
                  $el.css('visibility', 'visible');

                  // navigation events
                  if ($p_nav.length) {
                    $p_nav.on('click.gridnav', function (e) {
                      if ($wrapper.data('anim')) return false;
                      $wrapper.data('anim', true);
                      nav[settings.type.mode].pagination($wrapper, -1, settings);
                      return false;
                    });
                  }
                  if ($n_nav.length) {
                    $n_nav.on('click.gridnav', function (e) {
                      if ($wrapper.data('anim')) return false;
                      $wrapper.data('anim', true);
                      nav[settings.type.mode].pagination($wrapper, 1, settings);
                      return false;
                    });
                  }
                  /*
                  adds events to the mouse
                  */
                  // $el.on('mousewheel.gridnav', function (e, delta) {
                  //   if (delta > 0) {
                  //     if ($wrapper.data('anim')) return false;
                  //     $wrapper.data('anim', true);
                  //     nav[settings.type.mode].pagination($wrapper, -1, settings);
                  //   }
                  //   else {
                  //     if ($wrapper.data('anim')) return false;
                  //     $wrapper.data('anim', true);
                  //     nav[settings.type.mode].pagination($wrapper, 1, settings);
                  //   }
                  //   return false;
                  // });

                  $el.on('wheel.gridnav', function(e) {
                    var delta = e.originalEvent.deltaY; // 使用 deltaY 来检测滚轮方向
                    var direction = delta > 0 ? 1 : -1;
                  
                    if ($wrapper.data('anim')) {
                      return false;
                    }
                  
                    $wrapper.data('anim', true);
                    nav[settings.type.mode].pagination($wrapper, direction, settings);
                  
                    return false;
                  });
                }
              }).attr('src', $img.attr('src'));
            });

          });
        }
      }
    };

  $.fn.gridnav = function (method) {
    if (methods[method]) {
      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
    } else if (typeof method === 'object' || !method) {
      return methods.init.apply(this, arguments);
    } else {
      $.error('Method ' + method + ' does not exist on jQuery.gridnav');
    }
  };
})(jQuery);