通过相交来判断是否在可视区域内，页面滚动，苹果系统小程序不能时时监听变化，安卓的可以时时监听res返回的值，苹果的需要再滚动完停止了，才会返回res值 wx.createIntersectionObserver().relativeToViewport({ bottom: 100 }).observe('.select-area', (res) => { if (res.intersectionRect.bottom==0) { this.setData({ isfloat:true }) } else { this.setData({ isfloat: false }) } console.log(res) })

                      wx.getChannelsLiveNoticeInfo({                         finderUserName,                         success: (res)=>{                           if(res.reservable && res.status == 0){                           let noticeId = res.noticeId                           wx.reserveChannelsLive({                           noticeId,                           })                         }                     },                   })