- 当前 Bug 的表现（可附上截图）
VM2965:1 appServiceSDKScriptError
Cannot read property 'mode' of undefined;at api onAppEnterBackground callback function
TypeError: Cannot read property 'mode' of undefined
at Nt. (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:516751)
at Nt.emit (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:298602)
at Object.emit (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:316114)
at Nt. (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:322162)
at Nt.emit (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:298289)
at Object.emit (http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:316114)
at http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:317292
at http://127.0.0.1:44623/appservice/__dev__/WAService.js:1:255644
at e (http://127.0.0.1:44623/appservice/appservice?t=1547305122720:6895:2640)
at n.registerCallback.t (http://127.0.0.1:44623/appservice/appservice?t=1547305122720:6895:2903)
- 预期表现
我的微信小程序有一个扫码功能,在开发者工具上调试.点击调用wx.scanCode之后,就会出现上述报错,

微信小程序开发问题解答

微信小程序开发者回答：

参考 https://developers.weixin.qq.com/community/develop/doc/00006e5a9c0b086ffee7c25f256800

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