微信小程序组件滑动导航和获取元素实际高度

<view>
<scroll-view scroll-x scroll-with-animation scroll-left="{{menuIndex}}" style="height: 100px; width:100%;">
<view id='#haha' class='all' style='width:{{menuWidth}}px;'>
<block wx:key="lists" wx:for="{{lists}}">
<view id="a{{index}}" bindtap='jumpIndex' class='menu' data-menuindex='{{index}}'>{{item.list}}</view>
</block>
</view>
</scroll-view>
</view>

data: {
// 初始化滑动条数据
menuIndex:0,
// 每个菜单的宽度
onlyWidth: 70,
// 右侧的margin
marginWidth:10,
// 菜单总长
menuWidth:0,

lists:[
{ list: 'a1' },
{ list: 'a2' },
{ list: 'a3' },
{ list: 'a4' },
{ list: 'a5' },
{ list: 'a6' },
{ list: 'a7' }
],
},
jumpIndex:function(e){
var menuIndex = (e.currentTarget.dataset.menuindex-1)*80;
this.setData(
{menuIndex:menuIndex}
)
},

/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
let that=this;
let lists = this.data.lists;
let onlyWidth=this.data.onlyWidth;
let marginWidth=this.data.marginWidth;
let menuWidth = lists.length * (onlyWidth + marginWidth) - marginWidth;
that.setData({
menuWidth: menuWidth
})
// 获取用户高度
let query = wx.createSelectorQuery();
query.select('#a0').boundingClientRect()
query.exec(function (res) {
console.log(res);
})
},