let app = getApp();Page({ data: { img: "/images/1.jpg" }, onLoad() { }, scan() { wx.scanCode({  success: (res) => {  console.log("掃碼結果");  console.log(res);  this.setData({   img: res.result  })  },  fail: (res) => {  console.log(res);  } }) }})

<view class="view"> <image class="cover-9" src="{{img}}" bindtap="img"></image> <button type="primary" bindtap="scan" id="scan">掃一掃</button></view>

page{ height: 100%;}.view{ width: 100%; height: 100%;}.cover-9{ width: 688rpx; height: 80%; margin: 0 30rpx; border:2rpx solid; border-radius:5px; }button{ margin: 0 10rpx; width: 100%;}#scan{ width: 730rpx;}