公众号的

<script src="https://res.wx.qq.com/open/js/jweixin-1.6.0.js"></script>

// 进入页面获取配置
this.$api.app.jsSdk().then(({ data: response }) => {
  wx.config({
    debug: response.debug,
    appId: response.appId,
    timestamp: response.timestamp,
    nonceStr: response.nonceStr,
    signature: response.signature,
    jsApiList: response.jsApiList,
  });
  wx.ready(() => {
    wx.checkJsApi({
      jsApiList: ['scanQRCode'],
      success: ({ checkResult }) => {
        if (checkResult.scanQRCode) {
          this.scanQRCodeApi = true;
        }
      },
    });
  });
});

//按钮点击后触发
scanParcelCode(event) {
 
 wx.scanQRCode({
    needResult: 1,
    scanType: ['qrCode', 'barCode'],
    success: (res) => {
      let code;
      if (res.resultStr.startsWith('CODE')) {
        code = res.resultStr.substring(res.resultStr.indexOf(',') + 1);
      } else {
        code = res.resultStr;
      }
      this.checkParcelCode(code);
    },
    fail: () => {
    },
  });
  event.preventDefault();
  event.stopPropagation();
  return false;
},

请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。