微信小程序点击滚动到指定位置的实现

let query = wx.createSelectorQuery().in(this);
query.selectViewport().scrollOffset()
query.select("#Nav").boundingClientRect();
query.select("#FilterNav").boundingClientRect();
query.select("#"+((letter=='#')?'other':letter)).boundingClientRect();
query.exec(function (res) {
  let scrollTop = 0;
  if(res[3]){
   scrollTop = res[0].scrollTop + res[3].
  }else{
   scrollTop = res[0].scrollTop;
  }
  wx.pageScrollTo({
    scrollTop: scrollTop - res[1].height - res[2].height,
    duration: 300
  });
});

var query = wx.createSelectorQuery().in(this);
query.select("#swiper").boundingClientRect();
query.select("#"+ letter).fields({ rect:true,scrollOffset:true });
query.selectViewport().scrollOffset()
query.exec((res)=>{
 _this.setData({
   letterScroll: res[1]. - res[0].
 })
});