     createApp({
        data() {
          return {
            squareNum: 21,
            squareList: [],
          };
        },
        mounted() {
          // this.squareList = new Array(this.squareNum).fill(1);
          // window.addEventListener('scroll', (e) => {
          //   let scrollTop = document.documentElement.scrollTop
          //   const START_POS = 400;
          //   const END_POS = 700;
          //   // 400 - 700
          //   // 1 阶段：图标 y/scale（100px/0.3 