web-view 页面访问接口不能用，但是网站访问接口是可以的 报错信息 “  Request header field Content-Type is not allowed by Access-Control-Allow-Headers in preflight response.

如何监听setData数据已经在页面上完成渲染

- 当前 Bug 的表现（可附上截图） [图片] 代码: //index.js //获取应用实例 const app = getApp() Page({ data: { userInfo: {}, hasUserInfo: false, canIUse: wx.canIUse('button.open-type.getUserInfo'), devices: [], deviceId: '', services: [], serviceId: '', characteristicId: '', characteristicIdNotify: '', characteristicIdRead: '', }, onLoad() { // wx.showModal({ //   title: '提示', //   content: '请检查手机蓝牙是否打开', //   success: function (res) { //     that.setData({ //       isbluetoothready: false, //       searchingstatus: false //     }) //   } // }) }, /**   * @description 开启蓝牙适配器   */ openBlue() { let _this = this wx.openBluetoothAdapter({ success(res) { console.log('开启适配器：', res) // 搜索蓝牙设备 _this.discoverDevices() } }) }, closeBlue() { wx.closeBluetoothAdapter({ success(res) { console.log('关闭适配器: ', res) } }) }, /**   * @description 搜索蓝牙设备   */ discoverDevices() { let _this = this wx.startBluetoothDevicesDiscovery({ success(res) { console.log('搜索完成', res) setTimeout(() => { _this.getDevices() setTimeout(() => { _this.foundDevices() }, 500) }, 500) } }) }, /**   * @description 搜索新的蓝牙设备   */ foundDevices() { let _this = this wx.onBluetoothDeviceFound(function (devices) { console.log('检测到新设备：', devices) // 检测到新设备后，更新设备列表，供选择 _this.data.devices.push(devices.devices[0]) _this.setData({ devices: _this.data.devices }) }) }, /**   * @description 获取可连接的蓝牙设备   */ getDevices() { let _this = this wx.getBluetoothDevices({ success: function (res) { if (res.devices[0]) { console.log('获取设备:', res) _this.setData({ devices: res.devices }) } } }) }, chooseDevice(e) { let _this = this // 储存 deviceId _this.data.deviceId = e.currentTarget.dataset.deviceid // 连接设备 _this.createConnect(_this.data.deviceId) // console.log('_this.data.deviceId: ',_this.data.deviceId) }, createConnect(deviceId) { let _this = this wx.createBLEConnection({ // 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接 deviceId, success(res) { // 连接成功 console.log('连接设备成功：', res) // 获取 serviceId _this.getServices(deviceId) // 监听连接状态 _this.onConnectionStatus() // 停止搜索 _this.stopDiscoverDevices() }, fail(err) { console.warn('err :', err); } }) }, onConnectionStatus() { wx.onBLEConnectionStateChange(function (res) { // 该方法回调中可以用于处理连接意外断开等异常情况 console.log(`设备 ${res.deviceId} 连接状态变化, 连接状态: ${res.connected}`) }) }, /**   * @description 获取已连接的蓝牙设备   */ getConnectDevices(services) { wx.getConnectedBluetoothDevices({ services, success(res) { console.log('已连接的设备:' + JSON.stringify(res)) }, fail(err) { console.log('err: ', err.errMsg) } }) }, /**   * @description 停止搜索蓝牙设备   */ stopDiscoverDevices() { wx.stopBluetoothDevicesDiscovery({ success(res) { console.log('成功链接设备，停止搜索。') } }) }, /**   * @description 获得 services & serviceId   */ getServices(deviceId) { let _this = this wx.getBLEDeviceServices({ deviceId, success(res) { console.log('device services:', res.services) _this.getConnectDevices([res.services[2].uuid]) // 获取 serviceId _this.setData({ serviceId: res.services[2].uuid }) console.log('_this.serviceId :', _this.data.serviceId); _this.getCharacteristicsId(_this.data.deviceId, _this.data.serviceId) } }) }, /**   * @description 获得 CharacteristicsId   */ getCharacteristicsId(deviceId, serviceId) { let _this = this wx.getBLEDeviceCharacteristics({ deviceId, serviceId, success(res) { console.log('Characteristics:', res.characteristics) // 设置 characteristicId、characteristicIdNotify _this.setData({ characteristicIdNotify: res.characteristics[0].uuid, characteristicId: res.characteristics[0].uuid, }) _this.openNotify(deviceId, serviceId, _this.data.characteristicIdNotify) console.log('CharacteristicsId:', res.characteristics[0].uuid) } }) }, /**   * @description 开启 notify   */ openNotify(deviceId, serviceId, characteristicId) { let _this = this wx.notifyBLECharacteristicValueChange({ state: true, deviceId, serviceId, characteristicId, success(res) { console.log('notify 开启成功', res.errMsg) setTimeout(() => { _this.writeDevice(deviceId, serviceId, _this.data.characteristicId) }, 2000) }, fail(err) { console.log('openNotify err: ', err) } }) }, /**   * @description 向设备写入数据   */ writeDevice(deviceId, serviceId, characteristicId) { let _this = this // 向蓝牙设备发送一个0x00的16进制数据 let senddata = 'test' let buffer = new ArrayBuffer(senddata.length) let dataView = new DataView(buffer) for (var i = 0; i < senddata.length; i++) { dataView.setUint8(i, senddata.charAt(i).charCodeAt()) } // let buffer = new ArrayBuffer(2) // let dataView = new DataView(buffer) // dataView.setUint16(0, 3) wx.writeBLECharacteristicValue({ deviceId, serviceId, characteristicId, value: buffer, success(res) { console.log('写入数据成功', res.errMsg) _this.readDevice(deviceId, serviceId, _this.data.characteristicId) }, fail(err) { console.log('err', err) }, complete() { _this.closeConnection(deviceId) _this.closeBlue() } }) }, readDevice(deviceId, serviceId, characteristicId) { let _this = this // 必须在这里的回调才能获取 wx.onBLECharacteristicValueChange(function (characteristic) { console.log('characteristic value comed:', characteristic) }) wx.readBLECharacteristicValue({ // 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接 deviceId, // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取 serviceId, // 这里的 characteristicId 需要在 getBLEDeviceCharacteristics 接口中获取 characteristicId, success(res) { console.log('readBLECharacteristicValue:', res.errCode) } }) }, closeConnection(deviceId) { wx.closeBLEConnection({ deviceId, success(res) { console.log('关闭设备连接：', res) } }) } }) - 提供一个最简复现 Demo https://developers.weixin.qq.com/s/izuwUrmK784V

- 当前 Bug 的表现（可附上截图） ｗｘ．writeBLECharacteristicValue　没有回调 - 提供一个最简复现 Demo 代码片段 https://developers.weixin.qq.com/s/izuwUrmK784V

蓝牙打印机已经连接, wx.writeBLECharacteristicValue可以写入 wx.readBLECharacteristicValue(Object object)与 wx.notifyBLECharacteristicValueChange(Object object)都返回 状态码:10007 这样的蓝牙打印机 ,小程序可以用吗??? 第一次