H5使用蓝牙打印机

                      navigator.bluetooth.requestDevice({
                filters: [{ services: ['000018f0-0000-1000-8000-00805f9b34fb'] }]
            })
            .then(device => {
                console.log('Connecting to GATT Server...');
                // device.addEventListener('gattserverdisconnected', this._disconnect.bind(this));
                return device.gatt.connect();
            })
            .then(server => {
                console.log(server)
                return server.getPrimaryService("000018f0-0000-1000-8000-00805f9b34fb")
                }
            )
            .then(service => {
                console.log(service)
                return service.getCharacteristic("00002af1-0000-1000-8000-00805f9b34fb")
            }
            )
            .then(characteristic => {
                console.log(characteristic)
                //读数据
                // console.log("value:",characteristic.readValue())
                //监听数据
                // characteristic.addEventListener(
                //     'characteristicvaluechanged', e => {
                //        console.log("characteristicvaluechanged:",e.target.value)
                //     }
                // );
                // characteristic.startNotifications();
                //写数据
                var command = tsc.jpPrinter.createNew();
                command.setSize(57, 40);
                command.setGap(2); //传感器
                command.setCls();//清除打印机缓存
                command.setDensity(1);//浓度
                command.setText(30, 100, 'TSS24.BF2', 1, 1, '蓝牙打印机连接成功');
                command.setText(30, 150, 'TSS24.BF2', 1, 1, new Date().toTimeString());
                command.setQR(30, 200, 'L', 5, 'A', 'www.sjkjgz.com');
                command.setPagePrint();
                
                var data = Array.from(command.getData());
                var buffer = new ArrayBuffer(data.length);
                var dataView = new DataView(buffer);
                for (var j = 0; j < data.length; j++) {
                    dataView.setUint8(j, data[j]);
                }
                characteristic.writeValue(dataView)
                
            })
            .catch(error => {
                console.log('error: ' + error);
            });
            

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