小程序底部动画弹框

<view class="modals modals-bottom-dialog" hidden="{{hideModal}}">
  <view class="modals-cancel" bindtap="hideModal"></view>
  <view class="bottom-dialog-body bottom-pos" animation="{{animationData}}">
    <button class="yuyue" bindtap="subscribe">立即预约</button>
  </view>
</view>
<button bindtap="showModal" class="yuyue-to">立即预约</button>

/**index.wxss**/
/*模态框*/
.modals-cancel {
  position: absolute;
  z-index: 1000;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
}
.bottom-dialog-body {
  position: absolute;
  z-index: 10001;
  bottom: 0;
  left: 0;
  right: 0;
  height: 680rpx;
  background-color: #fff;
}
/*动画前初始位置*/
.bottom-pos {
  -webkit-transform: translateY(100%);
  transform: translateY(100%);
}
.yuyue {
  width: 100%;
  height: 100rpx;
  z-index: 9999;
  position: fixed;
  bottom: 0;
  border-radius: 0;
  border: 0;
  color: #fff;
  font-size: 40rpx;
  line-height: 100rpx;
  background-color: #069ff8;
}
.yuyue-to {
  width: 100%;
  height: 100rpx;
  position: fixed;
  bottom: 0;
  border-radius: 0;
  border: 0;
  color: #fff;
  font-size: 40rpx;
  line-height: 100rpx;
 background-color: #069ff8;
}

//index.js
//获取应用实例
const app = getApp()
Page({
  data: {
    hideModal: true, //模态框的状态  true-隐藏  false-显示
  },
  // 显示遮罩层 
  showModal: function() {
    var that = this;
    that.setData({
      hideModal: false
    })
    var animation = wx.createAnimation({
      duration: 600, //动画的持续时间 默认400ms 数值越大，动画越慢 数值越小，动画越快 
      timingFunction: 'ease', //动画的效果 默认值是linear 
    })
    this.animation = animation
    setTimeout(function() {
      that.fadeIn(); //调用显示动画 
    }, 200)
  },
  // 隐藏遮罩层 
  hideModal: function() {
    var that = this;
    var animation = wx.createAnimation({
      duration: 800, //动画的持续时间 默认400ms 数值越大，动画越慢 数值越小，动画越快 
      timingFunction: 'ease', //动画的效果 默认值是linear 
    })
    this.animation = animation
    that.fadeDown(); //调用隐藏动画 
    setTimeout(function() {
      that.setData({
        hideModal: true
      })
    }, 720) //先执行下滑动画，再隐藏模块 
  },
  //动画集 
  fadeIn: function() {
    this.animation.translateY(0).step()
    this.setData({
      animationData: this.animation.export() //动画实例的export方法导出动画数据传递给组件的animation属性 
    })
  },
  fadeDown: function() {
    this.animation.translateY(300).step()
    this.setData({
      animationData: this.animation.export(),
    })
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function() {
  },
})