微信小程序实现底部弹窗

<view bindtap="clickme">点击我可以看到底部弹框的出现</view>
 
<!--屏幕背景变暗的背景  -->
<view class="commodity_screen" bindtap="hideModal" wx:if="{{showModalStatus}}"></view>
<!--弹出框  -->
<view animation="{{animationData}}" class="commodity_attr_box" wx:if="{{showModalStatus}}">
<!--自定义弹窗内容-->
</view>

/*使屏幕变暗  */
.commodity_screen {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background: #000;
  opacity: 0.2;
  overflow: hidden;
  z-index: 1000;
  color: #fff;
}
/*对话框 */
.commodity_attr_box {
  height: 50%;
  width: 100%;
  overflow: hidden;
  position: fixed;
  bottom: 0;
  left: 0;
  z-index: 2000;
  background: #fff;
  padding-top: 20rpx;
}

//点击我显示底部弹出框
  clickme: function () {
    this.showModal();
  },
 
  //显示对话框
  showModal: function () {
    // 显示遮罩层
    var animation = wx.createAnimation({
      duration: 200,
      timingFunction: "linear",
      delay: 0
    })
    this.animation = animation
    animation.translateY(300).step()
    this.setData({
      animationData: animation.export(),
      showModalStatus: true
    })
    setTimeout(function () {
      animation.translateY(0).step()
      this.setData({
        animationData: animation.export()
      })
    }.bind(this), 200)
  },
  //隐藏对话框
  hideModal: function () {
    // 隐藏遮罩层
    var animation = wx.createAnimation({
      duration: 200,
      timingFunction: "linear",
      delay: 0
    })
    this.animation = animation
    animation.translateY(300).step()
    this.setData({
      animationData: animation.export(),
    })
    setTimeout(function () {
      animation.translateY(0).step()
      this.setData({
        animationData: animation.export(),
        showModalStatus: false
      })
    }.bind(this), 200)
  },