vtabs 异步加载 vtabs-content 内容数据，内容高度变化问题

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vtabs 异步加载 vtabs-content 内容数据，内容高度变化问题

[lypigg]

目前我的处理方法。在vtabs-content的index.wxml 中增加了一个 标记

  <view class="weui-vtabs-content__item" style="position: relative;" id="weui-vtabs-content__{{tabIndex}}">
  <slot></slot>
  <view class="flag" style="position: absolute;top: {{flagTop}}px;width: 1px;height: 1px;right: 0;opacity: 0;">
  </view>
</view>

修改了vtabs-content的index.js文件，在attached生命周期中增加边界碰撞监听，进行内容高度的变化监听。从而再更新vtabs中的heightRecords

attached: function attached() {
                             this._observer = wx.createIntersectionObserver(this)
.                          relativeTo('.weui-vtabs-content__item').observe('.flag',res => {
                                 this.calcHeight(this.change)
                             })
                         },          

                         detached: function () {
                             this._observer.disconnect()
                         }
                     },
                     methods: {
                         calcHeight: function calcHeight(callback) {
                             this.change = callback
                             var query = this.createSelectorQuery();
                             query.select('.weui-vtabs-content__item').boundingClientRect((rect) => {
                                 this._rect = rect
                                 this.setData({
                                     flagTop: rect.height
                                 })
                                 callback && callback(rect);
                             }).exec();
                         }
                     }
                 });