滑动

startX: 0,

marginL: 0,

bransWidth: 0,

bransContentWidth: 0,

bransShowContentWidth:'',

myTouchStart: function(e) {
    var that = this;
    if (that.data.appBrandList.length > 5) {
      that.setData({
        startX: e.touches[0].pageX - that.data.marginL
      });
    }
  },
  myTouchMove: function(e) {
    var that = this;
    if (that.data.appBrandList.length > 5) {
      let nowX = e.touches[0].pageX;
      let slideX = nowX - that.data.startX;
      this.setData({
        marginL: slideX
      });
    }
  },
  myTouchEnd: function(e) {
    var that = this;
    if (that.data.appBrandList.length != 0) {
      //获取代理品牌宽度
      wx.createSelectorQuery().select('#brans').boundingClientRect(function (rect) {
          that.setData({
            bransWidth: rect.width
          })
      }).exec();
      wx.createSelectorQuery().select('#brans-content').boundingClientRect(function (rect) {
          that.setData({
            bransContentWidth: rect.width
          })
        if (that.data.appBrandList.length > 5) {
          if (that.data.marginL >= 0) {
            that.setData({
              marginL: 0
            })
          } else if (that.data.marginL <= -that.data.bransContentWidth + that.data.bransWidth) {
            that.setData({
              marginL: -that.data.bransContentWidth + that.data.bransWidth
            });
          }
        }
      }).exec();
    }
   
  },