//电脑端中键滚动事件

var mousewheel =

  getBrowserInfo() == "Firefox" ? "DOMMouseScroll" : "mousewheel";

$(".jgui-accordion").on(mousewheel, function(event) {

  var delta = 0;

  var direction = 0;

  if (!event)

    /* For IE. */

    event = window.event;

  if (event.originalEvent.wheelDelta) {

    /* IE/Opera. */

    delta = event.originalEvent.wheelDelta / 120;

  } else if (event.originalEvent.detail) {

    delta = -event.originalEvent.detail / 3;

  }

  if (delta) {

    var datas = $(this).data("datas");

    datas._sumdelta += delta > 0 ? -1 : 1;

    datas._startmousewheeldatetime = new Date().valueOf();

    var obj = $(this);

    var handle = function() {

      var step = Math.floor(obj.height() / 10); //可视区高度

      var cur_top = obj.scrollTop(); //当前滚过的高度

      if (new Date().valueOf() - datas._startmousewheeldatetime > 100 && datas._sumdelta != 0) {

        //100ms内没有移动滚轮

        direction = datas._sumdelta;

        datas._sumdelta = 0;

        obj.stop().animate(

          {

            scrollTop: direction * Math.abs(direction) * step + cur_top

          },

          400,

          "linear",

          function() {

            clearInterval(datas._mouseintervalhandle);

            datas._mouseintervalhandle = undefined;

          }

        );

      }

    };

    if (datas._mouseintervalhandle == undefined) {

      datas._mouseintervalhandle = setInterval(handle, 10);

    }

  }

  stopPropagation(event);

});