//index.js
var app = getApp();
 
let animationShowHeight = 300;
 
Page({
 data:{
 animationData:"",
 showModalStatus:false,
 imageHeight:0,
 imageWidth:0
 },
 imageLoad: function (e) { 
 this.setData({imageHeight:e.detail.height,imageWidth:e.detail.width}); 
 },
 showModal: function () {
 // 顯示遮罩層
 var animation = wx.createAnimation({
 duration: 200,
 timingFunction: "linear",
 delay: 0
 })
 this.animation = animation
 animation.translateY(animationShowHeight).step()
 this.setData({
 animationData: animation.export(),
 showModalStatus: true
 })
 setTimeout(function () {
 animation.translateY(0).step()
 this.setData({
 animationData: animation.export()
 })
 }.bind(this), 200)
 },
 hideModal: function () {
 // 隱藏遮罩層
 var animation = wx.createAnimation({
 duration: 200,
 timingFunction: "linear",
 delay: 0
 })
 this.animation = animation;
 animation.translateY(animationShowHeight).step()
 this.setData({
 animationData: animation.export(),
 })
 setTimeout(function () {
 animation.translateY(0).step()
 this.setData({
 animationData: animation.export(),
 showModalStatus: false
 })
 }.bind(this), 200)
 },
 onShow:function(){
 let that = this;
 wx.getSystemInfo({
 success: function(res) {
 animationShowHeight = res.windowHeight;
 }
 })
 },
 
})

<!--index.wxml-->
<view class="container-column">
 
 <view animation="{{animationData}}" class="container-column buydes-dialog-container" wx:if="{{showModalStatus}}">
 <view class="buydes-dialog-container-top" bindtap="hideModal"></view>
 <view class="container-column buydes-dialog-container-bottom">
 <block wx:for="{{['操作1','操作2','操作3','取消']}}" wx:for-index="index" wx:key="key" wx:for-item="item">
 <view bindtap="hideModal" class="buydes-dialog-container-bottom-item" >{{item}}</view>
 </block>
 </view>
 </view>
 
 <image bindtap="showModal" bindload="imageLoad" style="width:{{imageWidth}}px;;height:{{imageHeight}}px;" src="../pro1.jpg"/>
 
</view>

.buydes-dialog-container{
 width: 100%;
 height: 100%;
 justify-content: space-between;
 background-color:rgba(15, 15, 26, 0.7);
 position: fixed;
 z-index: 999;
}
 
.buydes-dialog-container-top{
 flex-grow: 1;
}
 
.buydes-dialog-container-bottom{
 display: flex;
 flex-grow: 0;
}
 
.buydes-dialog-container-bottom-item{
 padding:24rpx;
 display: flex;
 justify-content: center;
 border-bottom: 1rpx solid #eeeeee;
}