onLoad: function (options) {

    var that = this

    wx.getScreenBrightness({

      success: function (res) {

        that.setData({        

          ScreenBrightness: res.value

        })

      }

    }),

    wx.setScreenBrightness({

      value: 0.9   //屏幕亮度值，范围 0~1，0 最暗，1 最亮   

    })

  },

  onHide:function(){

    console.log(this.data)

    wx.setScreenBrightness({

      value: this.data.currentBrightness

      })

},

苹果没有恢复之前亮度,需要手动调节