          trigger: ".main",
                start: "top top",
                end: "+400px",
                scrub: true,
                markers: true,
                // pin: true, // 动画执行期间，页面不进行滚动，动画执行结束后
              },
            }
          );
          gsap.fromTo(".dd-icon", {
            y: 0,
              scale: 1,
              opacity: 1,
          }, {
            y: -300,
            opacity: 0.3,
            scale: 2,
          