le: 1, duration: 1 }, "<");
            t2.to(".square-17", { x: 10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-18", { x: 10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-19", { x: 10, y: -100, scale: 1, duration: 1 }, "<");
            t2.to(".square-20", { x: 10, y: -100, scale: 1, duration: 1 }, "<");

            // step2 不上移，加快两边散开、放大
            // 左侧
            t2.to(".square-0", { x: -160, y: -165, scale: 1.2, durat