API - wx.createSelectorQuery() - 获得、修改参数

1、要用定时，要在渲染之后一点点时间才有宽度

wxml

<view class="data_height" style="height:100px">
<view style="height:{{target_height}}">

js

Page({
  data: {
    target_height: 0,
  },
  change_css() {
    setTimeout(() => {
    let query = wx.createSelectorQuery();
    query.select('.data_height').boundingClientRect(function(rect){
      let height = rect.height;
      console.log("height")
      console.log(height)
      that.setData({
        target_height: height+"px",
      })
    }).exec();},300)
}