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首先感谢几位的文章分享
https://blog.csdn.net/guairena/article/details/127941515
https://blog.csdn.net/qq_37970097/article/details/119148707

效果图：

使用的是 芝柯cc3 蓝牙打印机,
我这里没有存储蓝牙设备相关信息。所以每次打印都会重新初始化并搜索设备，储存相关的代码下面也有，所以代码部分有些冗余代码，可根据自己需求保留或删除

template：

<uni-popup ref="popupPrint" background-color="rgba(0,0,0,0)" type="bottom" :safe-area="false" @change="PrintPoupChange">
	<view class="radius">
		<view v-if="tempDeviceList.length" class="popup_title">请选择打印设备</view>
		<view class="reSignBtn" @click="gotoSignClick">重新签名</view>
		<scroll-view scroll-y="true" style="height: 40vh;">
			<view v-for="(item, index) in tempDeviceList" :key="index">
				<view class="hospitalNameBtn" @click="select_deviceId(item)">{{ item.name }}</view>
			</view>
			<view v-if="!tempDeviceList.length" class="searchBlue">
				<image style="width: 400rpx;height: 400rpx;margin: auto;" :src="imageUrl + 'loading.gif'" mode="widthFix"></image>
			</view>
			<view class="bottomSafe"></view>
		</scroll-view>
	</view>
</uni-popup>

使用到的相关sdk
printerjobs.js:

const pako = require('pako');
/*
 * @Author: zgt / ghd 
 * @FirstEditors: zgt
 * @FirstEditTime: 2019-10-18 18:49:24
 * @LastEditors:ghd
 * @LastEditTime:2020-03-17 16:09:59
 * @Description: file content
 */
//import { wxAsyncPromise } from './index';
/**
 *
 *
 * @export
 * @param {string} name 微信api的名称 ，如 wxAsyncPromise("getSystemInfo",options)
 * @param {object} options 除了success 和 fail 的其他参数
 * @returns
 */
export function wxAsyncPromise(name, options) {
	return new Promise((resolve, reject) => {
		wx[name]({
			//...(options || {}),
			...options,
			success: function(res) {
				resolve(res);
			},
			fail: function(res) {
				reject(res);
			},
		});
	});
}
//微信小程序向蓝牙打印机发送数据进行打印的坑：
//小程序api向蓝牙打印机发送数据打印，发送的任何内容都应该要转成二进制数据，而且蓝牙打印的文本编码是GBK的，发送中文需转成GBK编码再转成二进制数据发送
//发送打印机指令也要转成二进制数据发送
//蓝牙打印机一次接收的二级制数据有限制，不同的系统不同的蓝牙设备限制可能不同，微信建议一次20个字节，需做递归分包发送
//发送完要打印的内容后，一定要发送一个打印的指令才能顺利打印 （有些指令就不需要）

//一、初始化蓝牙、开始检索蓝牙设备
// { allowDuplicatesKey: true, interval: 500}
export function openBlue() {
	return wxAsyncPromise('openBluetoothAdapter').then((res) => {
		console.log('初始化蓝牙成功', res);
	});
}

export function startBluetoothDevicesDiscovery(option) {
	console.log('开始蓝牙扫描');
	wxAsyncPromise('startBluetoothDevicesDiscovery', option).then((res) => {
		console.log('正在搜寻蓝牙设备', res);
	});
}
//二、
/**
 *
 *
 * @export
 * @param {function} getDevices wx.getBluetoothDevices的监听回调函数
 */
export function onfindBlueDevices(getDevices) {
	//监听寻找到新设备的事件
	console.log('onfindBlueDevices...');
	wx.onBluetoothDeviceFound(function(devices) {
		//获取在蓝牙模块生效期间所有已发现的蓝牙设备
		wxAsyncPromise('getBluetoothDevices').then((res) => {
			getDevices && getDevices(res.devices);
		});
	});
}

/**
 * @export
 * @param {function} stopBlueDevicesDiscovery 关闭蓝牙扫描
 */
export function stopBlueDevicesDiscovery() {
	//监听寻找到新设备的事件
	console.log('停止蓝牙扫描');
	return wxAsyncPromise('stopBluetoothDevicesDiscovery').then((res) => {
		console.log('停止搜寻蓝牙设备', res);
	});
}



//三、连接蓝牙设备
/**
 * @export
 * @param {function} createBLEConnection 
 * @param {number} deviceId 蓝牙设备id
 */
export function createBLEConnection(deviceId, sucess, fail) {
	//连接蓝牙设备
	console.log('连接蓝牙设备', deviceId);
	wxAsyncPromise("createBLEConnection", {
			deviceId
		})
		.then(res => {
			//连接成功可选择停止搜索蓝牙
			//stopBlueDevicesDiscovery();
			console.log('连接成功');
			sucess && sucess({
				res: res,
			});
		})
		.catch(res => {
			console.log('连接设备异常' + res);
			fail && fail({
				res: res,
			});
		})
	/*.finally(res=>{
	    console.log('连接成功');
	    sucess && sucess({
	        res: res,
	    });
	});*/
}

export function closeBLEConnection(deviceId) {
	console.log('断开蓝牙设备', deviceId);
	wxAsyncPromise("closeBLEConnection", {
			deviceId
		})
		.then(res => {
			console.log('BLEDisconnect complete', res);
		})
		.catch(res => {
			console.log('断开设备异常' + res);
		})
	/*.finally(res=>{
	    console.log('BLEDisconnect complete', res);            
	});  */
}

//四、连接成功后， 获取蓝牙设备的service服务
// wxAsyncPromise("getBLEDeviceServices",{deviceId:""}).then(res=>{})
export function getBLEDeviceServices(deviceId, success, fail) {
	console.log('获取ServiceId', deviceId);
	wxAsyncPromise("getBLEDeviceServices", {
			deviceId
		})
		.then(res => {
			console.log('服务', res.services);
			success && success({
				serviceId: res.services,
			});
		})
		.catch((res) => {
			//getBLEDeviceServices(deviceId, success, fail);
			console.log('获取ServiceId异常' + res);
			fail && fail({
				res: res,
			});
		});
}

//五、获取的service服务可能有多个，递归获取特征值（最后要用的是能读，能写，能监听的那个值的uuid作为特征值id）
/**
 *
 *
 * @export
 * @param {number} deviceId 蓝牙设备id
 * @param {array} services wxAsyncPromise("getBLEDeviceServices",{deviceId:""}).then(res=>{})获取的res.services
 * @param {function} success 成功取得有用特征值uuid的回调函数
 */
export function getDeviceCharacteristics(deviceId, services, success, fail) {
	//services = services.slice(0);
	console.log('获取Characteristics', deviceId, services);
	if (services.length) {
		const serviceId = services.shift().uuid;
		console.log('ServceID ', serviceId);
		wxAsyncPromise('getBLEDeviceCharacteristics', {
				deviceId,
				serviceId,
			})
			.then((res) => {
				console.log('getBLEDeviceCharacteristics', deviceId, serviceId, res);
				let finished = false;
				let write = false;
				let notify = false;
				let indicate = false;
				var readId;
				var writeId;
				//有斑马品牌的一款打印机中res.characteristics的所有uuid都是相同的，找所有的properties存在(notify || indicate) && write这种情况就说明这个uuid是可用的（不确保所有的打印机都能用这种方式取得uuid,在主要测试得凯盛诺打印机res.characteristic只有一个uuid,所以也能用这个方式）
				for (var i = 0; i < res.characteristics.length; i++) {
					if (!notify) {
						notify = res.characteristics[i].properties.notify;
						if (notify) readId = res.characteristics[i].uuid;
					}
					if (!indicate) {
						indicate = res.characteristics[i].properties.indicate;
						if (indicate) readId = res.characteristics[i].uuid;
					}
					if (!write) {
						write = res.characteristics[i].properties.write;
						writeId = res.characteristics[i].uuid;
					}
					if ((notify || indicate) && write) {
						/* 获取蓝牙特征值uuid */
						success &&
							success({
								serviceId,
								writeId: writeId,
								readId: readId,
							});
						finished = true;
						break;
					}
				}

				if (!finished) {
					getDeviceCharacteristics(deviceId, services, success, fail);
				}
			})
			.catch((res) => {
				getDeviceCharacteristics(deviceId, services, success, fail);
			});
	} else {
		fail && fail();
	}
}

//六、启动notify 蓝牙监听功能 然后使用 wx.onBLECharacteristicValueChange用来监听蓝牙设备传递数据
/**
 *
 *
 * @export
 * @param {object} options
 * {
            deviceId,//蓝牙设备id
            serviceId,//服务id
            characteristicId,//可用特征值uuid
    }
 * @param {function} onChange 监听蓝牙设备传递数据回调函数
 */
export function onGetBLECharacteristicValueChange(options, onChange = function() {}) {
	console.log('deviceId ', options.deviceId);
	console.log('serviceId ', options.serviceId);
	console.log('characteristicId ', options.characteristicId);
	wxAsyncPromise('notifyBLECharacteristicValueChange', {
		state: true,
		...options,
	}).then((res) => {
		console.log('onBLECharacteristicValueChange ');
		wx.onBLECharacteristicValueChange(onChange);
	});
}

//七、发送数据(递归分包发送)
/**
 *
 *
 * @export
 * @param {object} options
 * {
            deviceId,
            serviceId,
            characteristicId,
			value [ArrayBuffer],
			lasterSuccess,
            onceLength
    }
 */

export function sendDataToDevice(options) {
	let byteLength = options.value.byteLength;
	//这里默认一次20个字节发送
	const speed = options.onceLength; //20; 
	//console.log("send data 20");
	//console.log(options);
	if (byteLength > 0) {
		wxAsyncPromise('writeBLECharacteristicValue', {
				...options,
				value: options.value.slice(0, byteLength > speed ? speed : byteLength),
			})
			.then((res) => {
				if (byteLength > speed) {
					sendDataToDevice({
						...options,
						value: options.value.slice(speed, byteLength),
					});
				} else {
					options.lasterSuccess && options.lasterSuccess();
				}
			})
			.catch((res) => {
				console.log(res);
			});
	}
}
export function charToArrayBuffer(str) {
	var out = new ArrayBuffer(str.length);
	var uint8 = new Uint8Array(out);
	var strs = str.split('');
	for (var i = 0; i < strs.length; i++) {
		uint8[i] = strs[i].charCodeAt();
	}
	return uint8;
}
export function charToArray(str) {
	var arr = [];
	var strs = str.split('');
	for (var i = 0; i < strs.length; i++) {
		arr[i] = strs[i].charCodeAt();
	}
	return arr;
}
//打印二维码
/**
 *
 *
 * @export
 * @param {object} options
 * {
            deviceId,
            serviceId,
            characteristicId,
            value,//ArrayBuffer:二维码的数据
    }
 */
export function printQR(options) {
	//打印二维码的十进制指令data：
	let data = [29, 107, 97, 7, 4, options.value.byteLength, 0];
	sendDataToDevice({
		...options,
		value: new Uint8Array(data).buffer,
		lasterSuccess: () => {
			//指令发送成功后，发送二维码的数据
			sendDataToDevice(options);
		},
	});
}

function grayPixle(pix) {
	return pix[0] * 0.299 + pix[1] * 0.587 + pix[2] * 0.114;
}

export function overwriteImageData(data) {
	let sendWidth = data.width,
		sendHeight = data.height;
	const threshold = data.threshold || 180;
	let sendImageData = new ArrayBuffer((sendWidth * sendHeight) / 8);
	sendImageData = new Uint8Array(sendImageData);
	let pix = data.imageData;
	const part = [];
	let index = 0;
	for (let i = 0; i < pix.length; i += 32) {
		//横向每8个像素点组成一个字节（8位二进制数）。
		for (let k = 0; k < 8; k++) {
			const grayPixle1 = grayPixle(pix.slice(i + k * 4, i + k * 4 + (4 - 1)));
			//阈值调整
			if (grayPixle1 > threshold) {
				//灰度值大于threshold位   白色 为第k位0不打印
				part[k] = 0;
			} else {
				part[k] = 1;
			}
		}
		let temp = 0;
		for (let a = 0; a < part.length; a++) {
			temp += part[a] * Math.pow(2, part.length - 1 - a);
		}
		//开始不明白以下算法什么意思，了解了字节才知道，一个字节是8位的二进制数，part这个数组存的0和1就是二进制的0和1，传输到打印的位图数据的一个字节是0-255之间的十进制数，以下是用权相加法转十进制数，理解了这个就用上面的for循环替代了
		// const temp =
		//     part[0] * 128 +
		//     part[1] * 64 +
		//     part[2] * 32 +
		//     part[3] * 16 +
		//     part[4] * 8 +
		//     part[5] * 4 +
		//     part[6] * 2 +
		//     part[7] * 1;
		sendImageData[index++] = temp;
	}
	return {
		array: Array.from(sendImageData),
		width: parseInt(sendWidth / 8),
		height: parseInt(sendHeight),
	};
}
/**
 * printImage
 * @param {object} opt
 * {
            deviceId,//蓝牙设备id
            serviceId,//服务id
            characteristicId,//可用特征值uuid
            lasterSuccess , //最后完成的回调
    }
 */
export function printImage(opt = {}, imageInfo = {}) {
	let arr = imageInfo.array,
		width = imageInfo.width;
	const writeArray = [];
	const xl = width % 256;
	const xh = width / 256;
	//分行发送图片数据,用的十进制指令
	const command = [29, 118, 48, 0, xl, xh, 1, 0]; //1D 76 30 00 w h 
	const enter = [13, 10];
	for (let i = 0; i < arr.length / width; i++) {
		const subArr = arr.slice(i * width, i * width + width);
		const tempArr = command.concat(subArr);
		writeArray.push(new Uint8Array(tempArr));
	}
	writeArray.push(new Uint8Array(enter));
	//console.log(writeArray);
	const print = (options, writeArray) => {
		if (writeArray.length) {
			console.log("send");
			sendDataToDevice({
				...options,
				value: writeArray.shift().buffer,
				lasterSuccess: () => {
					if (writeArray.length) {
						print(options, writeArray);
					} else {
						options.lasterSuccess && options.lasterSuccess();
					}
				},
			});
		}
	};
	console.log("start print");
	print(opt, writeArray);
}

/* 16hex insert 0 */
function Hex2Str(num) {
	if (num.toString(16).length < 2) return "0" + num.toString(16);
	else
		return num.toString(16);
}
/*****CPCL指令接口****/

/**
 * 配置项如下
 *
 * width: 标签纸的宽度，单位像素點
 * height: 标签纸的高度，单位像素點
 * 8像素=1mm
 * printNum: 打印张数，默认为1
 * rotation：页面整体旋转 1-90度 2-180度 3-270度 其他-不旋转
 */
export function CreatCPCLPage(width, height, printNum, rotation = 0, offset = 0) {
	var strCmd = '! ' + offset + ' 200 200 ' + height + ' ' + printNum + '
';
	strCmd += "PAGE-WIDTH " + width + '
';
	if (rotation == 1)
		strCmd += "ZPROTATE90
";
	else if (rotation == 2)
		strCmd += "ZPROTATE180
";
	else if (rotation == 3)
		strCmd += "ZPROTATE270
";
	else
		strCmd += "ZPROTATE0
";
	return strCmd;
}

/**
 * 打印文字
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * fontName,fontSize: 字体，取值： 參考文檔
 * rotation: 旋转 1-90度 2-180度 3-270度 其他-不旋转 
 * content: 文字内容
 */
export function addCPCLText(x, y, fontName, fontSize, rotation, content) {
	//console.log(fontName,fontSize,rotation, content);   
	var strCmd = '';
	if (rotation == 1) {
		strCmd += 'T90 ';
	}
	if (rotation == 2) {
		strCmd += 'T180 ';
	}
	if (rotation == 3) {
		strCmd += 'T270 ';
	} else {
		strCmd += 'T ';
	}
	strCmd += fontName + ' ' + fontSize + ' ' + x + ' ' + y + ' ' + content + '
';
	return strCmd;
};


/**
 * 打印多行文字
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * fontName,fontSize: 字体，取值： 參考文檔
 * height: 一行高度
 * content: 文字内容，注意换行需要
,单
不行
 */
export function addCPCLMLText(x, y, fontName, fontSize, height, content) {
	//console.log(fontName,fontSize,rotation, content);   
	var strCmd = 'ML ' + height + '
';
	strCmd += 'TEXT ' + fontName + ' ' + fontSize + ' ' + x + ' ' + y + '
' + content + 'ENDML
';
	return strCmd;
};

/**
 * 打印一维码
 *
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * codeType: 条码类型，取值为128、UPCA、UPCA2、UPCA5、UPCE、UPCE2、UPC5、EAN13、EAN13+2、EAN13+5、
 *      EAN8、EAN8+2、EAN8+5、39、39C、F39、F39C、93、CODABAR、CODABAR16、ITF、I2OF5
 * h: 条码高度，单位dot 
 * rotation: 顺时针旋转角度，取值如下：
 *     - 0 不旋转
 *     - 1 顺时针旋转90度
 *     
 * narrow: 窄条码比例因子(dot) 取值： 參考文檔
 * wide: 宽条码比例因子(dot) 取值： 參考文檔
 * content: 文字内容
 *
 */
export function addCPCLBarCode(x, y, codeType, h, rotation, narrow, wide, content) {
	var strCmd = '';
	if (rotation == 0)
		strCmd += 'B ';
	else
		strCmd += 'VB ';
	strCmd += codeType + ' ' + narrow + ' ' + wide + ' ' + h + ' ' + x + ' ' + y + ' ' + content + '
'
	return strCmd;
};

/**
 * 打印二维码
 *
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * level: 错误纠正能力等级，取值为L(7%)、M(15%)、Q(25%)、H(30%)
 * ver: 1-10 版本，根据内容调整以获取合适容量
 * scale: 1-10 放大倍数
 * content: 文字内容
 *
 */
export function addCPCLQRCode(x, y, level, ver, scale, content) {
	var strCmd = 'B QR ' + x + ' ' + y + ' M ' + ver + ' U ' + scale + '
' + level + 'A,' + content + '
';
	strCmd += 'ENDQR
';
	return strCmd;
};

/**
 * 放大指令
 * scaleX: 横向放大倍数 1，2，3等整数
 * scaleY: 纵向放大倍数 1，2，3等整数
 */
export function addCPCLSETMAG(scaleX, scaleY) {
	var strCmd = 'SETMAG ' + scaleX + ' ' + scaleY + '
';
	return strCmd;
};

/**
 * 对齐指令 0-左对齐 1-右对齐 2-居中
 */
export function addCPCLLocation(set) {
	var strCmd = '';
	if (set == 1) {
		strCmd += 'RIGHT
';
	} else if (set == 2) {
		strCmd += 'CENTER
';
	} else {
		strCmd += 'LEFT
';
	}
	return strCmd;
};

/**
 * 反白线 x0,y0,x1,y1,width
 */
export function addCPCLInverseLine(x0, y0, x1, y1, width) {
	var strCmd = 'IL ' + x0 + ' ' + y0 + ' ' + x1 + ' ' + y1 + ' ' + width + '
';
	return strCmd;
};

/**
 * 画线 x0,y0,x1,y1,width
 */
export function addCPCLLine(x0, y0, x1, y1, width) {
	var strCmd = 'L ' + x0 + ' ' + y0 + ' ' + x1 + ' ' + y1 + ' ' + width + '
';
	return strCmd;
};

/**
 * 画框 x0,y0,x1,y1,width
 */
export function addCPCLBox(x0, y0, x1, y1, width) {
	var strCmd = 'BOX ' + x0 + ' ' + y0 + ' ' + x1 + ' ' + y1 + ' ' + width + '
';
	return strCmd;
};

/**
 * 字体加粗
 */
export function addCPCLSETBOLD(bold) {
	var strCmd = 'SETBOLD ' + bold + '
';
	return strCmd;
};

/**
 * 字体下划线
 */
export function addCPCLUNDERLINE(c) {
	var strCmd = 'UNDERLINE ';
	if (c) strCmd += 'ON
';
	else if (c) strCmd += 'OFF
';
	return strCmd;
};

/**
 * 水印打印灰度等级 0-255
 */
export function addCPCLBACKGROUND(level) {
	var strCmd = 'BACKGROUND ';
	if (level > 255 || level < 0) level = 255;
	strCmd += level + '
';
	return strCmd;
};

/**
 * 打印水印文字
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * fontName,fontSize: 字体，取值： 參考文檔
 * rotation: 旋转 1-90度 2-180度 3-270度 其他-不旋转 
 * content: 文字内容
 */
export function addCPCLBKVText(x, y, fontName, fontSize, rotation, content) {
	//console.log(fontName,fontSize,rotation, content);   
	var strCmd = '';
	if (rotation == 1) {
		strCmd += 'BKT90 ';
	}
	if (rotation == 2) {
		strCmd += 'BKT180 ';
	}
	if (rotation == 3) {
		strCmd += 'BKT270 ';
	} else {
		strCmd += 'BKT ';
	}
	strCmd += fontName + ' ' + fontSize + ' ' + x + ' ' + y + ' ' + content + '
';
	return strCmd;
};


/**
 * 标签缝隙定位指令
 */
export function addCPCLGAP() {
	var strCmd = 'GAP-SENSE
FORM
';
	return strCmd;
};

/**
 * 标签右黑标检测指令
 */
export function addCPCLSENSE() {
	var strCmd = 'BAR-SENSE
FORM
';
	return strCmd;
};

/**
 * 标签左黑标检测指令
 */
export function addCPCLSENSELEFT() {
	var strCmd = 'BAR-SENSE LEFT
FORM
';
	return strCmd;
};

/**
 * 打印指令
 */
export function addCPCLPrint() {
	var strCmd = 'PRINT
';
	return strCmd;
};

/**
 * 图片打印指令
 * x: 文字方块左上角X座标，单位dot
 * y: 文字方块左上角Y座标，单位dot
 * data{
            threshold,//0/1提取的灰度级
            width,//图像宽度
            height,//图像高度
            imageData , //图像数据
    }
 */
export function addCPCLImageCmd(x, y, data) {
	var strImgCmd = '';
	const threshold = data.threshold || 180;
	let myBitmapWidth = data.width,
		myBitmapHeight = data.height;
	// let len = parseInt((myBitmapWidth + 7) / 8); //一行的数据长度
	//console.log('len=',len);
	//console.log('myBitmapWidth=',myBitmapWidth);
	//console.log('myBitmapHeight=',myBitmapHeight);
	// let ndata = 0;
	// let i = 0;
	// let j = 0;
	// let sendImageData = new ArrayBuffer(len * myBitmapHeight);
	let sendImageData = data.imageData;
	// sendImageData = new Uint8Array(sendImageData);
	// let pix = data.imageData;
	// console.log('pix=', pix);

	// for (i = 0; i < myBitmapHeight; i++) {
	// 	for (j = 0; j < len; j++) {
	// 		sendImageData[ndata + j] = 0;
	// 	}
	// 	for (j = 0; j < myBitmapWidth; j++) {
	// 		const grayPixle1 = grayPixle(pix.slice((i * myBitmapWidth + j) * 4, (i * myBitmapWidth + j) * 4 + 3));
	// 		if (grayPixle1 > threshold ){
	// 			sendImageData[ndata + parseInt(j / 8)] |= (0x80 >> (j % 8));
	// 		}

	// 	}
	// 	ndata += len;
	// }

	// console.log('sendImageData=',sendImageData);
	//CPCL指令图片数据 
	strImgCmd += 'EG ' + myBitmapWidth + ' ' + myBitmapHeight + ' ' + x + ' ' + y + ' ';
	for (let i = 0; i < sendImageData.length; i++) {
		strImgCmd += Hex2Str(sendImageData[i]);
	}
	strImgCmd += '
';
	// console.log(strImgCmd);
	return strImgCmd;
}

function crc32fun(buf, offset, len) {
	const crcTable = new Uint32Array([
		0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535,
		0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD,
		0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D,
		0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
		0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4,
		0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
		0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC,
		0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
		0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB,
		0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F,
		0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB,
		0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
		0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA,
		0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE,
		0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A,
		0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
		0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409,
		0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
		0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739,
		0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
		0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268,
		0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0,
		0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8,
		0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
		0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF,
		0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703,
		0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7,
		0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
		0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE,
		0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
		0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6,
		0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
		0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D,
		0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5,
		0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605,
		0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
		0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
	]);

	let crc = -1;
	for (let i = offset; i < len + offset; i++) {
		crc = (crc >>> 8) ^ crcTable[(crc ^ buf[i]) & 0xFF];
	}
	return (crc ^ (-1));
};

export function myGzip(bytes) {
	var gzipData = pako.gzip(new Uint8Array(bytes));
	gzipData[8] = 0x04;
	gzipData[9] = 0x00;
	var crc = crc32fun(gzipData, 8, gzipData.byteLength - 8 - 4)
	gzipData[4] = ((gzipData.byteLength >> 0) & 0xFF);
	gzipData[5] = ((gzipData.byteLength >> 8) & 0xFF);
	gzipData[6] = ((gzipData.byteLength >> 16) & 0xFF);
	gzipData[7] = ((gzipData.byteLength >> 24) & 0xFF);
	gzipData[gzipData.byteLength - 4] = ((crc >> 0) & 0xFF);
	gzipData[gzipData.byteLength - 3] = ((crc >> 8) & 0xFF);
	gzipData[gzipData.byteLength - 2] = ((crc >> 16) & 0xFF);
	gzipData[gzipData.byteLength - 1] = ((crc >> 24) & 0xFF);
	let bufferGzip = new ArrayBuffer(gzipData.length);
	let dv = new DataView(bufferGzip);
	for (var i = 0; i < bufferGzip.byteLength; i++) {
		dv.setUint8(i, gzipData[i]);
	}
	//console.log(bufferGzip);
	return bufferGzip;
}

gbk.js

module.exports = {
  parseHex: parseHex,//提取十六进制
  stringTrim: stringTrim,//剔除空格回车
  strToGBKHex, strToGBKHex,//字符串转GBK十六进制内码
  asiiStrToHex, asiiStrToHex, //asii码字符串转十六进制字符串  用于图片打印
  stringToByte, stringToByte,
  toUTF8Array, toUTF8Array,
  // test, test,
  strToGBKByte,strToGBKByte,
  utf8ByteToUnicodeStr, utf8ByteToUnicodeStr,
  stringToArrayBuffer,arrayBufferToString,
  // formatUnixtimestamp, formatUnixtimestamp
}

var GBfh = "　、。·ˉˇ¨〃々—～‖…‘’“”〔〕〈〉《》「」『』〖〗【】±×÷∶∧∨∑∏∪∩∈∷√⊥∥∠⌒⊙∫∮≡≌≈∽∝≠≮≯≤≥∞∵∴♂♀°′″℃＄¤￠￡‰§№☆★○●◎◇◆□■△▲※→←↑↓〓ⅰⅱⅲⅳⅴⅵⅶⅷⅸⅹ⒈⒉⒊⒋⒌⒍⒎⒏⒐⒑⒒⒓⒔⒕⒖⒗⒘⒙⒚⒛⑴⑵⑶⑷⑸⑹⑺⑻⑼⑽⑾⑿⒀⒁⒂⒃⒄⒅⒆⒇①②③④⑤⑥⑦⑧⑨⑩㈠㈡㈢㈣㈤㈥㈦㈧㈨㈩ⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩⅪⅫ！＂＃￥％＆＇（）＊＋，－．／０１２３４５６７８９：；＜＝＞？＠ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ［＼］＾＿｀ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ｛｜｝￣ぁあぃいぅうぇえぉおかがきぎくぐけげこごさざしじすずせぜそぞただちぢっつづてでとどなにぬねのはばぱひびぴふぶぷへべぺほぼぽまみむめもゃやゅゆょよらりるれろゎわゐゑをんァアィイゥウェエォオカガキギクグケゲコゴサザシジスズセゼソゾタダチヂッツヅテデトドナニヌネノハバパヒビピフブプヘベペホボポマミムメモャヤュユョヨラリルレロヮワヰヱヲンヴヵヶΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρστυφχψω︵︶︹︺︿﹀︽︾﹁﹂﹃﹄︻︼︷︸︱︳︴АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюяāáǎàēéěèīíǐìōóǒòūúǔùǖǘǚǜüêɑńňɡㄅㄆㄇㄈㄉㄊㄋㄌㄍㄎㄏㄐㄑㄒㄓㄔㄕㄖㄗㄘㄙㄚㄛㄜㄝㄞㄟㄠㄡㄢㄣㄤㄥㄦㄧㄨㄩ─━│┃┄┅┆┇┈┉┊┋┌┍┎┏┐┑┒┓└┕┖┗┘┙┚┛├┝┞┟┠┡┢┣┤┥┦┧┨┩┪┫┬┭┮┯┰┱┲┳┴┵┶┷┸┹┺┻┼┽┾┿╀╁╂╃╄╅╆╇╈╉╊╋";
var GBhz = 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var GBK_A940 = "〡〢〣〤〥〦〧〨〩㊣㎎㎏㎜㎝㎞㎡"


//提取十六进制
function parseHex(data) {
  var hexRet = {}
  hexRet.data = ""
  hexRet.code = true

  for (var i = 0; i < data.length; i++) {
    try {
      var c = data.substring(i, i + 1);
      if (c == " " || c == "
" || c == "0") {
        //空格、回车不用屏蔽
        hexRet.data += c;
        continue;
      }
      var n = parseInt("0x" + c);
      if (!n) {
        // isHex = false;
        hexRet.code = false;
        break;
      }
      else {
        hexRet.data += c;
      }
    } catch (e) {
      // isHex = false;
      hexRet.code = false;
      break;
    }
  }
  return hexRet;
}

//剔除空格回车
function stringTrim(data) {
  var resultStr = data.replace(/[ ]/g, "");    //去掉空格
  return resultStr.replace(/[
]/g, "");//去掉回车换行
}

//将非中文字符串转16进制字符串，每个前面加0x,回车加0a0d
function strToHexCharCode(str) {
  if (str === "")
    return "";
  var hexCharCode = [];
  // 　　hexCharCode.push("0x");
  for (var i = 0; i < str.length; i++) {
    var c = str.substring(i, i + 1);
    if (c == "
") {
      //换行
      hexCharCode.push("0a".toString(16));
      continue;
    }
    else if (c == "
") {
      //回车
      hexCharCode.push("0d".toString(16));
      continue;
    }

    hexCharCode.push((str.charCodeAt(i)).toString(16));
  }
  return hexCharCode.join("");
}

//asii码字符串转十六进制字符串  用于图片打印
function asiiStrToHex(str) {
  var hex = "";
  for (var i = 0; i < str.length; i++) {
    var c1 = str.charAt(i)
    var c2 = str.substring(i, i + 1)
    var c3 = str.substring(i, i + 2)
    var c4 = str.substr(i, i + 1)
    var c5 = str.substr(i, i + 2)
    var c = str.charCodeAt(i).toString(16)
    var c6 = str.charCodeAt(i)
    if (c.length == 1) {
      c = "0" + c;
    }
    hex += c;
  }
  return hex;
}
function toUTF8Array(str) {
  var utf8 = [];
  for (var i = 0; i < str.length; i++) {
    var charcode = str.charCodeAt(i);
    if (charcode < 0x80) utf8.push(charcode);
    else if (charcode < 0x800) {
      utf8.push(0xc0 | (charcode >> 6),
        0x80 | (charcode & 0x3f));
    }
    else if (charcode < 0xd800 || charcode >= 0xe000) {
      utf8.push(0xe0 | (charcode >> 12),
        0x80 | ((charcode >> 6) & 0x3f),
        0x80 | (charcode & 0x3f));
    }
    // surrogate pair
    else {
      i++;
      // UTF-16 encodes 0x10000-0x10FFFF by
      // subtracting 0x10000 and splitting the
      // 20 bits of 0x0-0xFFFFF into two halves
      charcode = 0x10000 + (((charcode & 0x3ff) << 10)
        | (str.charCodeAt(i) & 0x3ff));
      utf8.push(0xf0 | (charcode >> 18),
        0x80 | ((charcode >> 12) & 0x3f),
        0x80 | ((charcode >> 6) & 0x3f),
        0x80 | (charcode & 0x3f));
    }
  }
  return utf8;
}

//字符串转GBK十六进制内码
function strToGBKHex(str) {
  var ch, pos, val, ret = "", strSpecial = "!"#$%&'()*+,/:;<=>?@[]^`{|}~%";
  console.log('GBK123');
  for (var i = 0; i < str.length; i++) {
    ch = str.charAt(i);
    val = str.charCodeAt(i);
    if (val >= 0x4e00 && val < 0x9FA5){
      if ((pos = GBhz.indexOf(ch)) != -1)
        ret += ("%" + (0xB0 + parseInt(pos / 94)).toString(16) + "%" + (0xA1 + pos % 94).toString(16)).toUpperCase();
    } 
    else if ((pos = GBfh.indexOf(ch)) != -1){
      console.log('GBfh'+ch)
      ret += ("%" + (0xA1 + parseInt(pos / 94)).toString(16) + "%" + (0xA1 + pos % 94).toString(16)).toUpperCase();
    }
    else if ((pos = GBK_A940.indexOf(ch)) != -1){
      console.log(pos)
      ret += ("%" + (0xA9).toString(16) + "%" + (0x40 + pos).toString(16)).toUpperCase();
    }
    else if (strSpecial.indexOf(ch) != -1) {
      // ret += "%" + val.toString(16);      
      ret += val.toString(16);
    }
    else if (ch == " ") {
      // ret += "+";
      ret += "20";
    }
    else {
      //
      ret += strToHexCharCode(ch);
    }

  }
  return ret;
}

function stringToByte(str) {
  var bytes = new Array();
  var len, c;
  len = str.length;
  for (var i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    console.log('c', c)
    if (c >= 0x010000 && c <= 0x10FFFF) {
      bytes.push(((c >> 18) & 0x07) | 0xF0);
      bytes.push(((c >> 12) & 0x3F) | 0x80);
      bytes.push(((c >> 6) & 0x3F) | 0x80);
      bytes.push((c & 0x3F) | 0x80);
    } else if (c >= 0x000800 && c <= 0x00FFFF) {
      bytes.push(((c >> 12) & 0x0F) | 0xE0);
      bytes.push(((c >> 6) & 0x3F) | 0x80);
      bytes.push((c & 0x3F) | 0x80);
    } else if (c >= 0x000080 && c <= 0x0007FF) {
      bytes.push(((c >> 6) & 0x1F) | 0xC0);
      bytes.push((c & 0x3F) | 0x80);
    } else {
      bytes.push(c & 0xFF);
    }
  }
  return bytes;
}

function strToGBKByte(str) {
  var bytes = new Array();
  /*********改自<a href="http://blog.csdn.net/qiushuiwuhen/article/details/14112">qiushuiwuhen(2002-9-16)</a>********/
  var ch, pos, val, strSpecial = "!"#$%&'()*+,/:;<=>?@[]^`{|}~%";
  for (var i = 0; i < str.length; i++) {
    ch = str.charAt(i);
    val = str.charCodeAt(i);
    //console.log(ch, val)
    if (val >= 0x4e00 && val < 0x9FA5) {      
      if ((pos = GBhz.indexOf(ch)) != -1){ bytes.push(0xB0 + parseInt(pos / 94)); bytes.push(0xA1 + pos % 94);}        
    }
    else if ((pos = GBfh.indexOf(ch)) != -1){      
      bytes.push(0xA1 + parseInt(pos / 94)); bytes.push(0xA1 + pos % 94);
    }
    else if((pos = GBK_A940.indexOf(ch)) != -1){
      bytes.push(0xA9); bytes.push(0x40+pos);
    }    
    else if (strSpecial.indexOf(ch) != -1) {      
      bytes.push(val);
    }
    else if (ch == " ") {   
      bytes.push(0x20);
    }
    else {      
      bytes.push(val);
    }
  }

  const buffer = new Uint8Array(bytes).buffer;
  return buffer;
}

/**
 * utf8 byte to unicode string
 * @param utf8Bytes
 * @returns {string}
 */
function utf8ByteToUnicodeStr(utf8Bytes) {
  var unicodeStr = "";
  for (var pos = 0; pos < utf8Bytes.length;) {
    // var flag = utf8Bytes[pos];
    var flag = utf8Bytes.charCodeAt(pos);
    var unicode = 0;
    if ((flag >>> 7) === 0) {
      unicodeStr += String.fromCharCode(utf8Bytes[pos]);
      pos += 1;

    } else if ((flag & 0xFC) === 0xFC) {
      unicode = (utf8Bytes[pos] & 0x3) << 30;
      unicode |= (utf8Bytes[pos + 1] & 0x3F) << 24;
      unicode |= (utf8Bytes[pos + 2] & 0x3F) << 18;
      unicode |= (utf8Bytes[pos + 3] & 0x3F) << 12;
      unicode |= (utf8Bytes[pos + 4] & 0x3F) << 6;
      unicode |= (utf8Bytes[pos + 5] & 0x3F);
      unicodeStr += String.fromCharCode(unicode);
      pos += 6;

    } else if ((flag & 0xF8) === 0xF8) {
      unicode = (utf8Bytes[pos] & 0x7) << 24;
      unicode |= (utf8Bytes[pos + 1] & 0x3F) << 18;
      unicode |= (utf8Bytes[pos + 2] & 0x3F) << 12;
      unicode |= (utf8Bytes[pos + 3] & 0x3F) << 6;
      unicode |= (utf8Bytes[pos + 4] & 0x3F);
      unicodeStr += String.fromCharCode(unicode);
      pos += 5;

    } else if ((flag & 0xF0) === 0xF0) {
      unicode = (utf8Bytes[pos] & 0xF) << 18;
      unicode |= (utf8Bytes[pos + 1] & 0x3F) << 12;
      unicode |= (utf8Bytes[pos + 2] & 0x3F) << 6;
      unicode |= (utf8Bytes[pos + 3] & 0x3F);
      unicodeStr += String.fromCharCode(unicode);
      pos += 4;

    } else if ((flag & 0xE0) === 0xE0) {
      unicode = (utf8Bytes[pos] & 0x1F) << 12;;
      unicode |= (utf8Bytes[pos + 1] & 0x3F) << 6;
      unicode |= (utf8Bytes[pos + 2] & 0x3F);
      unicodeStr += String.fromCharCode(unicode);
      pos += 3;

    } else if ((flag & 0xC0) === 0xC0) { //110
      unicode = (utf8Bytes[pos] & 0x3F) << 6;
      unicode |= (utf8Bytes[pos + 1] & 0x3F);
      unicodeStr += String.fromCharCode(unicode);
      pos += 2;

    } else {
      unicodeStr += String.fromCharCode(utf8Bytes[pos]);
      pos += 1;
    }
  }
  return unicodeStr;
}

function stringToArrayBuffer(str) {
	var bytes = new Array(); 
	var len,c;
	len = str.length;
	for(var i = 0; i < len; i++){
		c = str.charCodeAt(i);
		if(c >= 0x010000 && c <= 0x10FFFF){
			bytes.push(((c >> 18) & 0x07) | 0xF0);
			bytes.push(((c >> 12) & 0x3F) | 0x80);
			bytes.push(((c >> 6) & 0x3F) | 0x80);
			bytes.push((c & 0x3F) | 0x80);
		}else if(c >= 0x000800 && c <= 0x00FFFF){
			bytes.push(((c >> 12) & 0x0F) | 0xE0);
			bytes.push(((c >> 6) & 0x3F) | 0x80);
			bytes.push((c & 0x3F) | 0x80);
		}else if(c >= 0x000080 && c <= 0x0007FF){
			bytes.push(((c >> 6) & 0x1F) | 0xC0);
			bytes.push((c & 0x3F) | 0x80);
		}else{
			bytes.push(c & 0xFF);
		}
  }
  var array = new Int8Array(bytes.length+1);
  for(var i in bytes){
    array[i] =bytes[i];
  }
  array[bytes.length]=0;
	return array.buffer;
}

function arrayBufferToString(arr){
  if(typeof arr === 'string') {  
      return arr;  
  }  
  var dataview=new DataView(arr.data);
  var ints=new Uint8Array(arr.data.byteLength);
  for(var i=0;i<ints.length;i++){
    ints[i]=dataview.getUint8(i);
  }
  arr=ints;
  var str = '',  
      _arr = arr;  
  for(var i = 0; i < _arr.length; i++) {  
      var one = _arr[i].toString(2),  
          v = one.match(/^1+?(?=0)/);  
      if(v && one.length == 8) {  
          var bytesLength = v[0].length;  
          var store = _arr[i].toString(2).slice(7 - bytesLength);  
          for(var st = 1; st < bytesLength; st++) {  
              store += _arr[st + i].toString(2).slice(2);  
          }  
          str += String.fromCharCode(parseInt(store, 2));  
          i += bytesLength - 1;  
      } else {  
          str += String.fromCharCode(_arr[i]);  
      }  
  }  
  return str; 
}

print.js

class Bluetooth {

	constructor() {
		this.isOpenBle = false;
		this.deviceId = "";
		this.serviceId = "";
		this.writeId = "";
		this.notifyId = "";
		this.BluetoothConnectStatus = false;
		this.printStatus = false;
		// this.init()
	}
	init() {
		return new Promise((resolve, reject) => {
			this.closeBluetoothAdapter().then(() => {
				console.log("init初始关闭蓝牙模块")
				this.openBluetoothAdapter().then(() => {
					console.log("init初始化蓝牙模块")
					// this.reconnect() //自动连接蓝牙设备
					resolve()
				})
			})
		});

	}
	showToast(title) {
		uni.showToast({
			title: title,
			icon: 'none',
			'duration': 2000
		});
	}

	openBluetoothAdapter() {
		return new Promise((resolve, reject) => {
			uni.openBluetoothAdapter({
				success: res => {
					this.isOpenBle = true;
					resolve(res);
				},
				fail: err => {
					this.showToast(`蓝牙未打开`);
					reject(err);
				},
			});
		});

	}

	startBluetoothDevicesDiscovery() {
		if (!this.isOpenBle) {
			this.showToast(`初始化蓝牙模块失败`)
			return;
		}

		let self = this;
		uni.showLoading({
			title: '蓝牙搜索中'
		})
		return
		new Promise((resolve, reject) => {
			setTimeout(() => {
					uni.startBluetoothDevicesDiscovery({
						success: res => {
							resolve(res)
						},
						fail: res => {
							self.showToast(`搜索设备失败` + JSON.stringify(err));
							reject(err);
						}
					})
				},
				300);
		});
	}

	stopBluetoothDevicesDiscovery() {
		let self = this;
		return new Promise((resolve, reject) => {
			uni.stopBluetoothDevicesDiscovery({
				success: e => {
					uni.hideLoading();
				},
				fail: e => {
					uni.hideLoading();
					self.showToast(`停止搜索蓝牙设备失败` + JSON.stringify(err));
				}
			})
		});
	}

	createBLEConnection() {
		//设备deviceId
		let deviceId = this.deviceId;
		let self = this;

		// uni.showLoading({
		// 	mask: true,
		// 	title: '设别连接中,请稍候...'
		// })
		console.log(this.deviceId, 'prinjs');
		return new Promise((resolve, reject) => {
			uni.createBLEConnection({
				deviceId,
				success: (res) => {
					console.log("res:createBLEConnection " + JSON.stringify(res));
					resolve(res)
				},
				fail: err => {
					uni.hideLoading();
					self.showToast(`搜索蓝牙设备失败` + JSON.stringify(err));
					reject(err);
				}
			})
		});
	}

	//获取蓝牙设备所有服务(service)
	getBLEDeviceServices() {
		let _serviceList = [];
		let deviceId = this.deviceId;
		let self = this;

		return new Promise((resolve, reject) => {
			setTimeout(() => {
					uni.getBLEDeviceServices({
						deviceId,
						success: res => {
							for (let service of res.services) {
								if (service.isPrimary) {
									_serviceList.push(service);
								}
							}
							uni.hideLoading();
							console.log("_serviceList: " + JSON.stringify(_serviceList));
							resolve(_serviceList)
						},
						fail: err => {
							uni.hideLoading();
							self.showToast(`获取设备服务失败` + JSON.stringify(err));
							reject(err);
						},
					})
				},
				500);
		});
	}

	//获取蓝牙设备某个服务中所有特征值(characteristic)
	getBLEDeviceCharacteristics() {
		// console.log("getBLEDeviceCharacteristics")
		let deviceId = this.deviceId;
		let serviceId = this.serviceId;

		let self = this;
		return new Promise((resolve, reject) => {
			uni.getBLEDeviceCharacteristics({
				deviceId,
				serviceId,
				success: res => {
					for (let _obj of res.characteristics) {
						//获取notify
						if (_obj.properties.notify) {
							self.notifyId = _obj.uuid;
							uni.setStorageSync('notifyId', self.notifyId);
						}
						//获取writeId
						if (_obj.properties.write) {
							self.writeId = _obj.uuid;
							uni.setStorageSync('writeId', self.writeId);
						}
					}

					//console.log("res:getBLEDeviceCharacteristics " + JSON.stringify(res));
					let result = {
						'notifyId': self.notifyId,
						'writeId': self.writeId
					};
					// self.showToast(`获取服务中所有特征值OK,${JSON.stringify(result)}`);
					this.BluetoothStatus = true
					resolve(result)
				},
				fail: err => {
					self.showToast(`getBLEDeviceCharacteristics` + JSON.stringify(err));
					reject(err);
				}
			})
		});
	}

	//断开联链接
	closeBLEConnection() {
		let deviceId = this.deviceId;
		uni.closeBLEConnection({
			deviceId,
			success(res) {
				console.log("closeBLEConnection" + res)
			}
		})
	}

	notifyBLECharacteristicValue() {
		let deviceId = this.deviceId;
		let serviceId = this.serviceId;
		let characteristicId = this.notifyId;

		uni.notifyBLECharacteristicValueChange({
			state: true,
			// 启用 notify 功能
			deviceId,
			serviceId,
			characteristicId,
			success(res) {
				uni.onBLECharacteristicValueChange(function(res) {
					console.log('onBLECharacteristicValueChange', res);
				});
			},
			fail(res) {
				console.log('notifyBLECharacteristicValueChange failed:' + res.errMsg);

			}
		});
	}

	writeBLECharacteristicValue(buffer) {
		let deviceId = this.deviceId;
		let serviceId = this.serviceId;
		let characteristicId = this.writeId;

		// console.log(deviceId);
		// console.log(serviceId);
		// console.log(characteristicId);
		return new Promise((resolve, reject) => {
			uni.writeBLECharacteristicValue({
				deviceId,
				serviceId,
				characteristicId,
				value: buffer,
				success(res) {
					console.log('message发送成功', JSON.stringify(res));
					resolve(res);
				},
				fail(err) {
					console.log('message发送失败', JSON.stringify(err));
					reject(err);
				}
			});
		});
	}

	closeBluetoothAdapter() {
		return new Promise((resolve, reject) => {
			uni.closeBluetoothAdapter({
				success: res => {
					resolve()
				},
				fail: (err) => {
					console.log(err, 'mysad');
					resolve()
				}
			});
		})

	}

	//若APP在之前已有搜索过某个蓝牙设备，并成功建立连接，可直接传入之前搜索获取的 deviceId 直接尝试连接该设备，无需进行搜索操作。
	reconnect() {
		(async () => {
			try {
				this.deviceId = this.deviceId || uni.getStorageSync("deviceId");
				this.serviceId = this.serviceId || uni.getStorageSync("serviceId");
				console.log("this.deviceId", this.deviceId)
				console.log("this.serviceId", this.serviceId)
				let result1 =
					await this.createBLEConnection();
				console.log("createBLEConnection: " + JSON.stringify(result1));

				let result2 = await this.getBLEDeviceServices();
				console.log("getBLEDeviceServices: " + JSON.stringify(result2));

				let result3 = await this.getBLEDeviceCharacteristics();
				console.log("getBLEDeviceCharacteristics: " + JSON.stringify(result3));
				this.BluetoothConnectStatus = true
				this.showToast("蓝牙打印设备连接成功")
				// this.writeId = uni.getStorageSync("writeId");
				// this.notifyId = uni.getStorageSync("notifyId");
			} catch (err) {
				console.log("err: " + err);
				this.showToast("蓝牙打印设备连接失败")
			}

		})();
	}
}

export
default Bluetooth;

页面相关操作代码：

import Bluetooth from '@/utils/print.js';
const gbk = require('../../utils/gbk.js');
import * as zksdk from '../../utils/printerjobs.js';

...

data() {
	return {
		hasSignPix: false, // 是否有签名图片
		tempDeviceList: [],
		serviceList: [],
		bluetooth: new Bluetooth(),
		...
	};
}

methods:{

	// 初始化蓝牙，并搜索蓝牙设备，显示弹窗列表
		async printOrder() {
			await this.bluetooth.init();
			let self = this;
			self.tempDeviceList = [];
			uni.startBluetoothDevicesDiscovery({
				services: ['xxx'], // 打印设备的服务号,不填写的话就搜索附近所有蓝牙设备
				success: res => {
					uni.onBluetoothDeviceFound(devices => {
						console.log('发现设备: ' + JSON.stringify(devices));
						if (self.tempDeviceList.length && devices.devices[0].name && !self.tempDeviceList.some(item => item.name == devices.devices[0].name)) {
							self.tempDeviceList.push(devices.devices[0]);
						} else if (!self.tempDeviceList.length) {
							self.tempDeviceList.push(devices.devices[0]);
						}
					});
					this.$refs.popupPrint.open();
				},
				fail: err => {
					console.log('搜索设备失败' + JSON.stringify(err));
					uni.showToast({
						title: '搜索设备失败' + JSON.stringify(err),
						icon: 'none'
					});
				}
			});
		},
		// 选中设备 并获取该蓝牙的服务，
		async select_deviceId(item) {
			uni.showLoading({
				title: '连接中...',
				mask: true
			});
			this.bluetooth.deviceId = item.deviceId;
			uni.setStorageSync('deviceId', this.bluetooth.deviceId);
			this.serviceList = [];
			this.$refs.popupPrint.close();
			try {
				//1.链接设备
				let result = await this.bluetooth.createBLEConnection();
				//2.寻找服务
				let result2 = null;
				setTimeout(async () => {
					result2 = await this.bluetooth.getBLEDeviceServices();
					console.log('获取服务: ' + JSON.stringify(result2));
					this.serviceList = result2;

					console.log('serviceList', this.serviceList.length);

					if (this.serviceList[0].uuid) {
						this.select_service(this.serviceList[0].uuid);
					} else {
						uni.showToast({
							title: '不是打印设备',
							icon: 'none'
						});
					}
				}, 1000);
			} catch (e) {
				console.log('e: ' + JSON.stringify(e));
			}
		},
		// 从该蓝牙服务中 过滤特性服务 notifyId 和 writeId
		async select_service(res) {
			this.bluetooth.serviceId = res;
			// console.log('this.bluetooth.serviceId', this.bluetooth.serviceId);
			uni.setStorageSync('serviceId', res);

			try {
				let result = await this.bluetooth.getBLEDeviceCharacteristics();

				this.writeBLECharacteristicValueShenqindan();
			} catch (e) {
				console.log('e: ' + JSON.stringify(e));
			}
		},

		// 准备打印内容
		async writeBLECharacteristicValueShenqindan() {
			const str = this.orderInfo.orderItemDisplay;
			const remarkStr = this.orderInfo.remark;
			// 此处是将字符串做打印换行处理，每行24个字符，备注每行18个字符
			const orderItemDisplayResult = str.replace(/(.{24})/g, '$1
') + '
';
			const remarkResult = remarkStr.replace(/(.{18})/g, '$1
') + '
';
			
			uni.canvasGetImageData({  // 获取签名图片，并用canvas获取图片数据
				canvasId: 'handWriting3',
				x: 0,
				y: 0,
				width: 304,
				height: 128,
				success: res => {
					let pixData = {
						width: 304, // 宽和高 最好是8的倍数，不然打印出来是个黑色块块
						height: 128, // 宽和高 最好是8的倍数，不然打印出来是个黑色块块
						imageData: res.data,
						threshold: 190
					};
					let result = zksdk.overwriteImageData(pixData);
					let pix = {
						width: result.width,
						height: result.height,
						imageData: result.array
					};

					let strCmd = zksdk.CreatCPCLPage(570, 1700, 1, 0);
					strCmd += zksdk.addCPCLLocation(2);
					strCmd += zksdk.addCPCLText(0, 30, '8', '4', 0, this.orderInfo.labName);
					strCmd += zksdk.addCPCLText(0, 70, '8', '2', 0, '检验申请单');
					strCmd += zksdk.addCPCLLine(0, 120, 560, 120, 3);
					strCmd += zksdk.addCPCLLocation(2);
					strCmd += zksdk.addCPCLBarCode(0, 150, '128', 80, 0, 1, 1, this.orderInfo.orderCode);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 280, '3', '0', 0, '医院名称');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 280, '3', '0', 0, this.orderInfo.hospitalName);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 320, '3', '0', 0, '科室');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 320, '3', '0', 0, this.orderInfo.hospitalDepName);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 360, '3', '0', 0, '申请人');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 360, '3', '0', 0, this.orderInfo.createdName);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 400, '3', '0', 0, '申请时间');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 400, '3', '0', 0, this.orderInfo.createdTime);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 440, '3', '0', 0, '订单号');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 440, '3', '0', 0, this.orderInfo.orderCode);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 480, '3', '0', 0, '患者姓名');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 480, '3', '0', 0, this.orderInfo.patient.name);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 520, '3', '0', 0, '患者性别');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 520, '3', '0', 0, this.orderInfo.patient.sex == 1 ? '男' : '女');
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 560, '3', '0', 0, '患者年龄');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 560, '3', '0', 0, this.orderInfo.patient.ageDisplay);
					strCmd += zksdk.addCPCLLine(0, 590, 560, 590, 3);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 620, '3', '0', 0, '检测项目');
					strCmd += zksdk.addCPCLMLText(10, 660, '0', '24', '30', orderItemDisplayResult);
					strCmd += zksdk.addCPCLText(10, 920, '3', '0', 0, '总计金额');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 920, '3', '0', 0, `${this.orderInfo.totalAmount} 元`);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 960, '3', '0', 0, '备注信息');
					strCmd += zksdk.addCPCLLocation(1);
					strCmd += zksdk.addCPCLText(10, 960, '3', '0', 0, remarkResult);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLLine(0, 1060, 560, 1060, 3);
					strCmd += zksdk.addCPCLLocation(2);
					strCmd += zksdk.addCPCLSETMAG(2, 2);
					strCmd += zksdk.addCPCLQRCode(0, 1090, 'M', 2, 6, this.orderInfo.orderCode);
					strCmd += zksdk.addCPCLLine(0, 1290, 560, 1290, 3);
					strCmd += zksdk.addCPCLSETMAG(0, 0);
					strCmd += zksdk.addCPCLLocation(0);
					strCmd += zksdk.addCPCLText(10, 1330, '3', '0', 0, '签名');
					if (this.hasSignPix) {
						strCmd += zksdk.addCPCLLocation(0);
						strCmd += zksdk.addCPCLImageCmd(10, 1370, { imageData: pix.imageData, width: pix.width, height: pix.height, threshold: 190 });
					}

					strCmd += zksdk.addCPCLPrint();
					let buffer = gbk.strToGBKByte(strCmd);
					console.log(buffer, 'befor');
					buffer = zksdk.myGzip(buffer);
					// let hexStr = Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join(' ');
					// console.log(hexStr);
					console.log(buffer, 'after');
					this.printbuffs(buffer);
				},
				fail: err => {
					console.log(err);
					uni.showToast({
						title: '获取签名失败，请重试',
						icon: 'none'
					});
				}
			});
		},
		// 转译传输内容，并截取20字节一次
		cutCommand(data) {
			var _this = this;
			var sendData64 = [];
			var packageLength = 20;
			// var byData = wx.base64ToArrayBuffer(ToBase64.encode64gb2312(data));
			var byData = data;
			for (let i = 0; i < Math.ceil(byData.byteLength / packageLength); i++) {
				var ble_end = packageLength * (i + 1);
				var ble_begin = i * packageLength;
				if (ble_end > byData.byteLength) {
					//从begin（包括），到end（不包括）。
					const newBuffer = byData.slice(ble_begin); // 从哪个开始到那个结束
					sendData64[i] = newBuffer;
				} else {
					const newBuffer = byData.slice(ble_begin, ble_end); // 从哪个开始到那个结束
					sendData64[i] = newBuffer;
				}
			}
			return sendData64;
		},

		// 传输内容
		printbuffs(buffer, fun) {
			let _t = this;
			let p = new Promise((resolve, reject) => {
				resolve(_t.cutCommand(buffer));
			});
			p.then(buffer => {
				this.printbuff(buffer, 1);
			});
		},
		// 打印
		async printbuff(buffer, times) {
			uni.showLoading({
				title: '打印中...',
				mask: true
			});
			let deviceId = this.bluetooth.deviceId;
			let serviceId = this.bluetooth.serviceId;
			let characteristicId = this.bluetooth.writeId;
			var _t = this;
			var sendData64 = buffer;
			if (sendData64.length >= times) {
				wx.writeBLECharacteristicValue({
					deviceId: deviceId,
					serviceId: serviceId,
					characteristicId: characteristicId,
					value: sendData64[times - 1],
					success: function(res) {
						_t.printbuff(buffer, ++times);
					},
					fail: function(res) {
						uni.showToast({
							title: "提示, '传输失败'"
						});
					}
				});
			} else {
				wx.hideLoading();
			}
		}


}

• 开始使用的是汉印的 蓝牙打印机，用了一个星期机器出了点故障，就换了芝柯的打印机，所以代码里面有一些注释了。
• 签名的的组件，在插件市场可以找到。稍微改造一下就行，需要注意的是，横图转角度，需要新建一个canvas 。
• 打印图片时，需先下载图片，创建canvas填充图片，获取canvas内容，转16进制再打印。一般图片内容会比较大，所以可以先 转成 黑白位图，基本会缩小4倍左右。 然后再使用 pako 压缩。主要是因为微信小程序的使用低功耗蓝牙，小程序不会对写入数据包大小做限制，但系统与蓝牙设备会限制蓝牙 4.0 单次传输的数据大小，超过最大字节数后会发生写入错误，建议每次写入不超过 20 字节。 而一张图片的内容，转译之后基本都是上万
• 关于图片宽和高 使用8的倍数，会方便一些。因为转黑白位图及转译时，会将8个单位压缩成1个