timeline();
          this.$nextTick(() => {
            // step1 - 方块上移，两边初步散开
            // 左侧
            t2.to(".square-0", { x: -10, y: -100, scale: 1, duration: 1 });
            t2.to(".square-1", { x: -10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-2", { x: -10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-3", { x: -10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-4", { x: -10, y: -100, scale: 1, d