//index.js 
//获取应用实例 
var app = getApp() 
Page({ 
 data: { 
 flag: false 
 }, 
 a: function(){ 
 this.setData({flag: false}) 
 }, 
 b: function(){ 
 this.setData({flag: true}) 
 } 
}) 

.b1{position:fixed;width:100%;height:100%;top:0px;background:rgba(0,0,0,0.4);overflow: hidden;} 
.t_w{position:relative;} 
.b2{width: 90%;margin:35% auto;overflow: hidden;background-color: #fff;border-radius: 10rpx;} 
.v1{margin:110rpx auto 30rpx auto;color:#999;font-size:28rpx;background-color: #fff;padding:0rpx 30rpx;text-align: center;} 
.v2{background-color: #ff0000;padding:20rpx 0rpx;text-align: center;overflow: hidden;} 
.v3{background-color: deepskyblue;padding:20rpx 0rpx;text-align: center;overflow: hidden;} 
.p1{display: block;margin:10rpx auto;font-size: 34rpx;height:34rpx;line-height:34rpx;color: #ffffff;} 
.p2{display: block;margin:10rpx auto;font-size: 24rpx;height:24rpx;line-height:24rpx;color: #ffffff;} 
.t_image{width:204rpx;height:200rpx;position: absolute;top: -26%;left:40%;} 
.t_image1{display:block;width:204rpx;height:200rpx;} 
.btn1{border:1px solid transparent;outline:none;margin:0rpx auto;-webkit-appearance: none;-moz-appearance: none;height: 88rpx;line-height: 88rpx;width:630rpx;border-radius: 60rpx;font-family: '微软雅黑';font-size: 36rpx;color: #ffffff;cursor: pointer;background-color: #f05000;text-align: center;box-shadow:0rpx 10rpx 9rpx 0rpx rgba(240,80,0,0.35); 
} 
.btn2{margin:30rpx auto 40rpx auto;border:1px solid transparent;outline:none;-webkit-appearance: none;-moz-appearance: none;height: 88rpx;line-height: 88rpx;width:630rpx;border-radius: 60rpx;font-family: '微软雅黑';font-size: 36rpx;color: #ffffff;cursor: pointer;background-color: #5adad0;text-align: center;box-shadow:0rpx 10rpx 9rpx 0rpx rgba(90,218,208,0.35); 
} 

<view class="b1" hidden="{{flag}}"> 
   <view class="t_w"> 
    <view class="t_image"> 
            <image class="t_image1" src="/UploadFiles/2021-04-02/qcm.png">

到此位置，demo已经完成


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