【报Bug】uni.scanCode扫码页面点击返回走了success而不是fail

详细问题描述

（DCloud产品不会有明显的bug，所以你遇到的问题大都是在特定环境下才能重现的问题，请仔细描述你的环境和重现方式，否则DCloud很难排查解决你的问题）

[内容]

重现步骤

[步骤]
使用uni.scanCode调出扫码页面，然后点击左上角返回按钮，回调走的是success和complete，而侧滑返回走的是fail和complete。如果调用uni.scanCode进入扫码页面后先侧滑返回再调用uni.scanCode，就会报错，报错信息如下，这时点左上角返回就走的fail和complete

报错信息
12:00:18.300 appServiceSDKScriptError
12:00:18.300 scanCode 已注册:function (e){if(e&&!e.errMsg)i=e;else{var t=e&&e.errMsg?" "+e.errMsg:"";i={errMsg:"scanCode:fail"+t}}}; at uni.scanCode
12:00:18.300 B@app-service.js:2:4846
12:00:18.300 scanCode@app-service.js:2:58971
12:00:18.300 zn@app-service.js:2:82477
12:00:18.300 app-service.js:3:844
12:00:18.300 invoke@app-service.js:3:889
12:00:18.300 invoke@app-service.js:3:104451
12:00:18.300 X@app-service.js:3:162045
12:00:18.300 app-service.js:3:169498
12:00:18.300 af@app-service.js:3:365970
12:00:18.300 app-service.js:3:209890
12:00:18.300 app-service.js:3:417763
12:00:18.300 app-service.js:3:417805
12:00:18.300 app-service.js:3:173431
12:00:18.300 scan
12:00:18.301 scan@[native code]
12:00:18.301 forEach@[native code]
12:00:18.301 forEach@[native code]
12:00:18.301 handleEvent
12:00:18.301 app-service.js:3:578796
12:00:18.301 safeCallback@app-service.js:3:423904
12:00:18.301 call@app-service.js:3:423793
12:00:18.301 n@app-service.js:3:426793
12:00:18.301 app-service.js:3:427372
12:00:18.301 p@app-service.js:3:426337
12:00:18.301 dispatchEvent@app-service.js:3:427269
12:00:18.301 triggerEvent@app-service.js:3:427484
12:00:18.301 triggerEvent@app-service.js:3:503807
12:00:18.301 $emit
12:00:18.301 _onClick
12:00:18.301 _onClick@[native code]
12:00:18.301 forEach@[native code]
12:00:18.301 forEach@[native code]
12:00:18.301 handleEvent
12:00:18.301 safeCallback@app-service.js:3:423904
12:00:18.301 app-service.js:3:564625
12:00:18.301 app-service.js:3:567853
12:00:18.301 app-service.js:3:567127
12:00:18.301 n@app-service.js:3:170255
12:00:18.301 subscribeHandler@app-service.js:3:1563
12:00:18.301 app-service.js:2:82378
12:00:18.301 app-service.js:2:82399
12:00:18.301 app-service.js:2:85059
12:00:18.301 app-service.js:2:85089
12:00:18.302 consume@weex-main-jsfm.js:1:20313
12:00:18.302 map@[native code] __ERROR
[结果]

[期望]

[如果语言难以表述清晰，拍一个视频或截图，有图有真相]

IDE运行环境说明

[HBuilder 或 HBuilderX。如果你用其他工具开发uni-app，也需要在此说明]

[IDE版本号]
2.1.1
[windows版本号]
window10
[mac版本号]

uni-app运行环境说明

[运行端是h5或app或某个小程序？]
app
[运行端版本号]

[项目是cli创建的还是HBuilderX创建的？如果是cli创建的，请更新到最新版cli再试]
HBuilderX
[编译模式是老模板模式还是新的自定义组件模式？]
自定义组件模式

App运行环境说明

[Android版本号]

[iOS版本号]
12.3.1
[手机型号]
iPhone XR
[模拟器型号]

附件

[IDE问题请提供HBuilderX运行日志。菜单帮助-查看运行日志，点右键打开文件所在目录，将log文件压缩成zip包上传]

[App问题请提供可重现问题的代码片段，你补充的细一点，问题就解决的快一点]

[App安装包或H5地址]

[可重现代码片段]

联系方式

[QQ]