fix:修复

src/modules/course-manage/offline-course/modal/QRCodeModal.jsx

@@ -151,7 +151,7 @@ export default class QRCodeModal extends React.Component {
           key="1"
           onClick={() => this.setState({ showPreviewModal: true, imgUrl: imgUrl1 })}
         >
-          <img src="https://image.xiaomaiketang.com/xm/mmQTfFSJ2j.jpg" className="image" />
+          <img src="https://image.xiaomaiketang.com/xm/Q42ZRrQDkJ.png" className="image" />
           <div className="title">签到二维码</div>
           <div className="name">{courseName}</div>
           <div className="qrcodeWrap" id="qrcodeWrap1"></div>
@@ -162,7 +162,7 @@ export default class QRCodeModal extends React.Component {
           key="2"
           onClick={() => this.setState({ showPreviewModal: true, imgUrl: imgUrl2 })}
         >
-          <img src="https://image.xiaomaiketang.com/xm/mmQTfFSJ2j.jpg" className="image" />
+          <img src="https://image.xiaomaiketang.com/xm/Q42ZRrQDkJ.png" className="image" />
           <div className="title">签退二维码</div>
           <div className="name">{courseName}</div>
           <div className="qrcodeWrap" id="qrcodeWrap2"></div>

src/modules/course-manage/offline-course/modal/QRCodeModal.less

@@ -10,7 +10,7 @@
     .image {
       width: 100%;
       height: 100%;
-      object-fit: cover;
+      object-fit: contain;
       box-shadow: 0px 0px 30px 0px rgba(128, 128, 128, 0.1);
       border-radius: 6px;
     }