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]
下载hello uniapp演示
接口设备-扫码
扫第一次没问题
扫第二次报错
[结果]
13:48:16.612 ||"",charSet:"utf8",path:"",errMsg:"scanCode:ok"}:{errMsg:"scanCode:fail"})}; at uni.scanCode
13:48:16.633 48:16.364 5272 5310 I console : I@(global function):7:4599
13:48:16.654 48:16.364 5272 5310 I console : scanCode@(global function):7:52541
13:48:16.673 48:16.364 5272 5310 I console : Un@(global function):7:76759
13:48:16.696 48:16.364 5272 5310 I console : (global function):8:844
13:48:16.714 48:16.364 5272 5310 I console : invoke@(global function):8:889
13:48:16.735 48:16.364 5272 5310 I console : invoke@(global function):8:105643
13:48:16.755 48:16.364 5272 5310 I console : X@(global function):8:163217
13:48:16.775 48:16.364 5272 5310 I console : (global function):8:170670
13:48:16.796 48:16.364 5272 5310 I console : af@(global function):8:366228
13:48:16.817 48:16.364 5272 5310 I console : (global function):8:211062
13:48:16.838 48:16.364 5272 5310 I console : (global function):8:418032
13:48:16.859 48:16.364 5272 5310 I console : (global function):8:418074
13:48:16.879 48:16.364 5272 5310 I console : (global function):8:174603
13:48:16.900 48:16.364 5272 5310 I console : scanCode@(global function):12494:19
13:48:16.942 48:16.364 5272 5310 I console : (global function):2446:24
13:48:16.983 48:16.364 5272 5310 I console : (global function):2433:26
13:48:17.024 48:16.364 5272 5310 I console : handleEvent@(global function):2423:20
13:48:17.044 48:16.364 5272 5310 I console : safeCallback@(global function):8:424173
13:48:17.065 48:16.364 5272 5310 I console : (global function):8:564894
13:48:17.085 48:16.364 5272 5310 I console : (global function):8:568122
13:48:17.105 48:16.364 5272 5310 I console : (global function):8:567396
13:48:17.126 48:16.364 5272 5310 I console : n@(global function):8:171427
13:48:17.147 48:16.364 5272 5310 I console : subscribeHandler@(global function):8:1563
13:48:17.167 48:16.364 5272 5310 I console : (global function):7:76660
13:48:17.188 48:16.364 5272 5310 I console : (global function):7:76681
13:48:17.208 48:16.364 5272 5310 I console : B@(global function):7:4462
13:48:17.228 48:16.364 5272 5310 I console : (global function):7:79047
13:48:17.249 48:16.364 5272 5310 I console : consume@(weex framework):1:19850
13:48:17.291 48:16.364 5272 5310 I console : (weex framework):1:177648__ERROR
[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]
[IDE版本号]
1.8.8 alpha
[windows版本号]
widnow10
[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]
1.8.8 alpha
App运行环境说明
[Android版本号]
miui10 安卓9
[iOS版本号]
12.2
[手机型号]
小米8
[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]
840442707
