aliapp-demo/util/items/index.js

export default {
  data: {
    animMaskData: [],
    animContentData: [],
  },
  animOp: {
    createMaskShowAnim() {
      const animation = my.createAnimation({
        duration: 200,
        timingFunction: 'cubic-bezier(.55, 0, .55, .2)',
      });

      this.maskAnim = animation;
  
      animation.opacity(1).step();
      this.setData({
        animMaskData: animation.export(),
      });
    },
    createMaskHideAnim() {
      this.maskAnim.opacity(0).step();
      this.setData({
        animMaskData: this.maskAnim.export(),
      });
    },
    createContentShowAnim() {
      const animation = my.createAnimation({
        duration: 200,
        timingFunction: 'cubic-bezier(.55, 0, .55, .2)',
      });  
      this.contentAnim = animation;  
      animation.translateY(0).step();
      this.setData({
        animContentData: animation.export(),
      });
    },
    createContentHideAnim() {
      this.contentAnim.translateY('100%').step();
      this.setData({
        animContentData: this.contentAnim.export(),
      });
    },
  },
};