麻烦提供一下当前webview的版本号
查看方法：

1. 点击设置中开发者选项，找到webview实现（或类似按钮），点击查看当前webview的版本号
2. 运行当前基座，在chrome中输入chrome://inspect/#devices，然后在当前设备名称下会显示webview的版本号，类似如下格式，后面的数字即为当前webview版本号
3. > MI NOTE LTE

   56D2261C

   WebView in io.dcloud.HBuilder (57.0.2987.132)

OPPO R9 Plusm A

19B2AF6F

WebView in io.dcloud.HBuilder (70.0.3538.64)
⚠ Remote browser is newer than client browser. Try inspect fallback if inspection fails.

Hello H5+
file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/www/index.html
inspectinspect fallback

我更换了另外一个手机，也是同样的问题
Remote Target

LOCALHOST

Coolpad Y82-820

DB1AD139

WebView in io.dcloud.HBuilder (33.0.0.0)

Hello H5+
file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/www/index.html
inspect

操作步骤

1. 打开蓝牙模块
2. 开始扫描蓝牙设备
   这时是可以扫描到一些设备的 （例如：可以正确识别出小米手环等）
3. 我打开低功耗设备（连接功能，默认这个设备是不能被扫描出来的）
   这时就会报（TypeError: Cannot read property 'map' of null）
4. 其它设备的还是可以正常输出
   在小程序中是正常的

补充下错误日志， 这个错误是在我启用 低功耗设备的连接功能时出现的;
启动连接功能，这个设备才能被描扫到。通过LightBlue和小程序，都是可以正常工作识别这个设备。

[{"deviceId":"49:C2:73:D7:7C:B1","name":"","RSSI":-82,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:51.035 TypeError: Cannot read property 'map' of null
15:40:51.157 发现的蓝牙设备:{"devices":[{"deviceId":"52:23:AD:67:E9:26","name":"","RSSI":-78,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:51.734 发现的蓝牙设备:{"devices":[{"deviceId":"62:1D:2B:2D:5E:A6","name":"","RSSI":-88,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:51.755 TypeError: Cannot read property 'map' of null
15:40:51.878 发现的蓝牙设备:{"devices":[{"deviceId":"03:90:74:27:4C:25","name":"","RSSI":-80,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:51.899 发现的蓝牙设备:{"devices":[{"deviceId":"45:63:A7:DC:EE:9C","name":"","RSSI":-81,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:51.919 TypeError: Cannot read property 'map' of null
15:40:52.043 TypeError: Cannot read property 'map' of null
15:40:52.166 发现的蓝牙设备:{"devices":[{"deviceId":"FE:70:D1:C5:49:32","name":"Mi Band 3","RSSI":-94,"localName":"Mi Band 3","advertisServiceUUIDs":["0000fee0-0000-1000-8000-00805f9b34fb"],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:52.194 deviceId:FE:70:D1:C5:49:32, name:Mi Band 3 at pages/center/equipments/bluetooth/add.vue:73
15:40:52.207 发现的蓝牙设备:{"devices":[{"deviceId":"59:C5:E4:7D:CA:41","name":"","RSSI":-93,"localName":"","advertisServiceUUIDs":[],"advertisData":{}}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:52.740 TypeError: Cannot read property 'map' of null
15:40:52.863 发现的蓝牙设备:{"devices":[{"deviceId":"80:7A:BF:17:F5:C3","name":"HTC BS C3D5B4","RSSI":-100,"localName":"HTC BS C3D5B4","advertisServiceUUIDs":["0000cb00-0000-1000-8000-00805f9b34fb"]}]} at pages/center/equipments/bluetooth/add.vue:63
15:40:52.883 deviceId:80:7A:BF:17:F5:C3, name:HTC BS C3D5B4 at pages/center/equipments/bluetooth/add.vue:73
15:40:52.904 TypeError: Cannot read property 'map' of null

试了下Redmi 6， 问题仍然存在

2A22965E7D28

WebView in io.dcloud.HBuilder (68.0.3440.91)
Android版本 8.1.0