在HbuilderX中实现微信小程序下蓝牙连接打印机完整实战案例

1.基础开发环境，所用到的 Api 以及实现的思路。
应用场景：

商家打印小票，小票包含顾客消费的商品明细信息以及末尾附上二维码，二维码供顾客扫码开票。

HBuilderX-高效极客技巧HBuilderX是当前最快的HTML开发工具，强大的代码助手帮你快速完成开发，最全的语法库和浏览器兼容性数据让浏览器碎片化不再头痛：项目是基于VUE框架开发的。
关于蓝牙设备的api地址：
uni-app官网https://uniapp.dcloud.io/api/system/bluetooth.html
大致实现思路：
1.在页面加载时，先判断本地缓存是否有历史连接蓝牙设备。
2.页面点击【打印】按钮时，最好是提前把此次需要打印的数据项先组装好。
3.点击打印后，先判断当前页面是否有历史连接蓝牙设备的信息：

如果有：直接连接蓝牙设备，进行打印；

如果没有：则以弹框的形式，搜索附近可用的蓝牙设备；
4.页面卸载时或者页面隐藏时，需要取消蓝牙连接并关闭蓝牙模块。

注：我这里是在当前页面弹框形式展示的蓝牙列表，大家可以根据自己实际项目需求来做出一些调整。
2.接下来直接上代码，以及依赖的js和弹框组件
弹框用的uni-popup 基础组件，如有需要，可以私信找我要。

<template>
  <view style="height: 100%;position: fixed;">
   <button type="primary" style="width: 30%;" @tap="f_print()">打印</button>
    <!-- 蓝牙配置弹窗 -->
    <uni-popup :show="isShowSearchBle" position="middle" mode="fixed">
        <view class="scrool-page">
            <view class="search-part">
                <button type="primary" style="" @tap="searchBlue()">搜索设备</button>
                <button type="primary" style="" @tap="stopSearchBlue()">停止搜索</button>
            </view>
            <scroll-view v-if="deviceListLength>0" class="panel-scroll-box" scroll-y="true" style="width:320px;">
              <view>
                <view v-for="(item,index) in devices" :key="index" class="bluetooth-item" @click="onBlueChange(item,index)">
                    <view class="list-item-oneline">
                        <view class="list-text" style="flex: 1;">
                            <text>{{item.name?item.name:'未命名'}}</text>
                        </view>
                        <text>({{Math.max(0, item.rssi + 100)}}%)</text>
                        <text class="list-statue" style="margin-left: 30px;">{{item.status?'已连接':'未连接'}}</text>
                    </view>
                </view>
              </view>
            </scroll-view>
            <view v-show="deviceListLength==0" style="border-top: 1px solid #EEEEEE;margin-top: 10px;padding-top:10px;">
                <image mode="aspectFit" src="/static/img/empty-icon.png"></image>
                <view class="empty-text">~ 无可搜索到的设备 ~</view>
            </view>
        </view>
    </uni-popup>
  </view>
</template>

注： 当页面没有可用的蓝牙设备时，有一个背景图片，当然这个只是一个样式，不是关键的，但我还是尽量做到完善和完整度。empty-icon.png图片如下：有水印，如有需要原图，可以私信我，我会及时回复的。

页面引入弹框组件和相关的蓝牙打印的js文件：

<script>
import * as Common from "@/common/util.js"
import {
      wxAsyncPromise ,debounce,catchToast,
      getDeviceCharacteristics,
      sendDataToDevice,
      printCommand,LAST_CONNECTED_DEVICE
  } from '../bluetooth/bluetoolth.js';
  import GBK from '../bluetooth/gbk.js';
  import uniPopup from '@/components/uni-popup.vue'
 
  export default {
    components: {
      uniPopup
    },
    data() {
      return {
        /* 蓝牙打印相关参数-start */
        isShowSearchBle:false,//是否显示蓝牙设备列表
        devices: [],//搜索到的附近蓝牙设备列表//{"name":"T5810000","devId":"UUUUUUUU","rssi":-20,"status":false}
        deviceName: '',//已连接或已选择的蓝牙设备名称
        deviceId: '',//已连接或已选择的蓝牙设备ID
        services:[],//蓝牙设备所有服务
        character:[],
        blueToothConnected:false,//是否已经连接
        blueToothPrintData:{},//传输给蓝牙设备的数据
        /* 蓝牙打印相关参数-end */
      }
    },
    computed: {
      //计算蓝牙设备列表长度
      deviceListLength() {
          return this.devices.length;
      }
    },
    onShow() {
      console.log(" 页面onShow");
      let lastDevice = wx.getStorageSync(LAST_CONNECTED_DEVICE);
      console.log("历史连接蓝牙设备:"+lastDevice);
      if(Common.isExist(lastDevice)){
          this.deviceId = lastDevice.split("&")[0];
        this.deviceName = lastDevice.split("&")[1];
      }
    },
    onHide() {
        console.log(" 页面onHide");
        //取消蓝牙连接并关闭蓝牙模块
        wxAsyncPromise('closeBLEConnection', {
            deviceId: this.deviceId,
        }).finally((res) => {
            wxAsyncPromise('closeBluetoothAdapter');
        });
    },
    onLoad(e) {
        let lastDevice = wx.getStorageSync(LAST_CONNECTED_DEVICE);
        console.log("历史连接蓝牙设备:"+lastDevice);
        if(Common.isExist(lastDevice)){
            this.deviceId = lastDevice.split("&")[0];
            this.deviceName = lastDevice.split("&")[1];
        }
    },
    onUnload() {
        //取消蓝牙连接并关闭蓝牙模块
        wxAsyncPromise('closeBLEConnection', {
            deviceId: this.deviceId,
        }).finally((res) => {
            wxAsyncPromise('closeBluetoothAdapter');
        });
    },
</script>

此处我只列出，当前与蓝牙打印相关的js文件：
1.

util.js 文件内容如下：根据自己实际需求决定是否引用

// alert提示
function alert (msg) {
    alert_duration(msg,2000);
}
function alert_duration (msg, duration) {
    if(!isExist(duration)){
        duration = 3000;
    }
    uni.showToast({
        title: msg,
        icon: "none",
        position: 'bottom',
        duration: duration
    });
}
//判断字符串是否存在
function isExist (str) {
  if (str !== null && str !== "undefined" && str !== "" && typeof str != "undefined" && !(typeof (str) == "string" &&
      str
      .split(" ").join("").length == 0)) {
    return true;
  } else {
    return false;
  }
}
//转换日期格式(时间戳转换为datetime格式)
function changeDateFormat(cellval, hms) {
    var dateVal = cellval + "";
    if (cellval != null) {
        var date = new Date(parseInt(dateVal.replace("/Date(", "").replace(")/", ""), 10));
        var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
        var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
 
        var hours = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
        var minutes = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
        var seconds = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
        if(hms){
            return date.getFullYear() + "-" + month + "-" + currentDate + " " + hours + ":" + minutes + ":" + seconds;
        }else{
            return date.getFullYear() + "-" + month + "-" + currentDate;
        }
    }
}
//计算字符长度（一个汉字2个字符）
function calculateStrLengh(str){
    var len=0;
    if(!isExist(str)){
        return 0;
    }
    for (var i=0; i<str.length; i++) {
        var c = str.charCodeAt(i);
        //单字节加1
        if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
            len++;
        }
        else {
            len+=2;
        }
    }
    return len;
}
// 声明
module.exports = {
  isExist,
  alert,
  alert_duration,
  changeDateFormat,
  calculateStrLengh
}

2.

分别是蓝牙设备相关的方法和中文编码js文件，截图中是我的文件在项目中的目录位置

bluetoolth.js 文件内容如下：

/*
 * @Author: zyf
 * @Date: 2022年2月18日12:30:21
 * @LastEditors: zyf
 * @LastEditTime: 2022年2月18日12:30:21
 * @Description: file content
 */
/**
 *
 *
 * @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 || {}),
            success: function(res) {
                resolve(res);
            },
            fail: function(res) {
                reject(res);
            },
        });
    });
}
export function debounce(func, wait) {
    let timer = null;
    return function(opt) {
        clearTimeout(timer);
        timer = setTimeout(() => {
            func && func.call(this, opt);
        }, wait || 60);
    };
}
 
//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
export function openBlue() {
    return wxAsyncPromise('openBluetoothAdapter').then((res) => {
        console.log('初始化蓝牙成功', res);
        return wxAsyncPromise('startBluetoothDevicesDiscovery').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
    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);
        });
    });
}
 
//三、连接蓝牙设备
// wxAsyncPromise("createBLEConnection",{deviceId:""}).then(res=>{
//连接成功可选择停止搜索蓝牙
// wxAsyncPromise("stopBluetoothDevicesDiscovery").then()
// }).catch(res=>{}).finally(()=>{})
 
//四、连接成功后， 获取蓝牙设备的service服务
// wxAsyncPromise("getBLEDeviceServices",{deviceId:""}).then(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);
    if (services.length) {
        const serviceId = services.shift().uuid;
        wxAsyncPromise('getBLEDeviceCharacteristics', {
            deviceId,
            serviceId,
        })
            .then((res) => {
                console.log('getBLEDeviceCharacteristics', deviceId, serviceId, res);
                let finished = false;
                let write = false;
                let notify = false;
                let indicate = false;
                
                for (var i = 0; i < res.characteristics.length; i++) {
                    if (!notify) {
                        notify = res.characteristics[i].properties.notify;
                    }
                    // if (!indicate) {
                    //     indicate = res.characteristics[i].properties.indicate;
                    // }
                    if (!write) {
                        write = res.characteristics[i].properties.write;
                    }
                    if ( write) {
                        /* 获取蓝牙特征值uuid */
                        success &&
                            success({
                                serviceId,
                                characteristicId: res.characteristics[i].uuid,
                            });
                      
                        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 onBLECharacteristicValueChange(options, onChange = function() {}) {
    wxAsyncPromise('notifyBLECharacteristicValueChange', {
        state: true,
        ...options,
    }).then((res) => {
        wx.onBLECharacteristicValueChange(onChange);
    });
}
 
//七、发送数据(递归分包发送)
/**
 *
 *
 * @export
 * @param {object} options
 * {
            deviceId,
            serviceId,
            characteristicId,
            value [ArrayBuffer],
            lasterSuccess,
    }
 */
 
export function sendDataToDevice(options) {
    let byteLength = options.value.byteLength;
    //这里默认一次20个字节发送
    const speed = options.onceByleLength || 20;
    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("发送数据失败"+res);
            wx.hideLoading();
            catchToast(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, 0, 1, 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: sendWidth / 8,
        height: 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,
//         height = imageInfo.height;
//     const writeArray = [];
//     const xl = width % 256;
//     const xh = width / 256;
//     const hl = height % 256;
//     const hh = height / 256;
//     //分行发送图片数据,用的十进制指令
//     const command = [29, 118, 48, 0, xl, xh, hl, hh];
//     // 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));
//     // }
//   const tempArr = command.concat(arr);
//   writeArray.push(new Uint8Array(tempArr));
//     const print = (options, writeArray) => {
//         if (writeArray.length) {
//             sendDataToDevice({
//                 ...options,
//                 value: writeArray.shift().buffer,
//                 lasterSuccess: () => {
//                     if (writeArray.length) {
//                         print(options, writeArray);
//                     } else {
//                         options.lasterSuccess && options.lasterSuccess();
//                     }
//                 },
//             });
//         }
//     };
//     print(opt, writeArray);
// }
export const LAST_CONNECTED_DEVICE = 'last_connected_device';
export const printCommand = {
    left: [27, 97, 0], //居左
    center: [27, 97, 1], //居中
    right: [27, 97, 2], //居右
    clear: [27, 64], //初始化
    enter: [10],
};
export function printImage(opt = {}, imageInfo = {}) {
       const { printAlign = 'left' } = opt;
       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
       const command = []
           .concat(printCommand.clear)
           .concat(printCommand[printAlign])
           .concat([29, 118, 48, 0, xl, xh, 1, 0]);
       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));
       }
       const len = writeArray.length;
       const print = (options, writeArray) => {
           if (writeArray.length) {
               sendDataToDevice({
                   ...options,
                   value: writeArray.shift().buffer,
                   lasterSuccess: () => {
                       options.onProgress && options.onProgress(Math.floor(((len - writeArray.length) / len) * 100));
                       if (writeArray.length) {
                           print(options, writeArray);
                       } else {
                           options.lasterSuccess && options.lasterSuccess();
                       }
                   },
               });
           }
       };
       print(opt, writeArray);
}
/**
 * 蓝牙设备异常信息
 */
export const errMsg = {
    10000: '未初始化蓝牙模块',
    10001: '蓝牙未打开',
    10002: '没有找到指定设备',
    10003: '连接失败',
    10004: '没有找到指定服务',
    10005: '没有找到指定特征值',
    10006: '当前连接已断开',
    10007: '当前特征值不支持此操作',
    10008: '系统上报异常',
    10009: '系统版本低于 4.3 不支持BLE',
    10012: '连接超时',
    10013: '连接 deviceId 为空或者是格式不正确'
};
/**
 * toast显示捕获的蓝牙异常
 */
export function catchToast(err) {
    let coode = err.errCode ? err.errCode.toString() : '';
    let msg = errMsg[coode];
    if(msg==undefined||msg==null || msg==""){
        msg=err.errMsg;
    }
    wx.showToast({
        title: msg || coode,
        icon: 'none',
        position: 'bottom',
        duration: 3000
    });
}
/*****CPCL指令接口****/

gbk.js文件内容如下：

/*!
 * gbk.js v0.2.4
 * Homepage https://github.com/cnwhy/GBK.js
 * License MIT
 */
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*95)B?*1!N]dtpux} *2)*)O**u*+!KS *-:*.5+1!VR *Xs*Y!+;8X *X!gm *U!RT *c!w}{| *d8+(!;<%~ +)!&'%A *d!65D=CQRFHM`Ydaevw~ *e!()*0/5 *U`+0u*Y_*Z!9S *[!N^ *Y!\\fcak}~ *Z!(, *Y!uv *Z)*Ym*Z!:EF1GI2WKbkmz|q} *[!/5.*2&>67FG?ekqdiz *\\!+0,8: *V!*4<7JF )?=*N!PXTV +)!BC%~ +*!&'%H *N!_ei *O_*R<*u>*t!-73JELSRnqt *u)+3!loq%vx +2!CPR *s!VYZko )sM*s}*g!Ww *h8*iU*j(*k/*jM*l!Jw ++!369%< )zB++!?BD%FHINOR%WY%]_abd%kn%qx%{~ +,&+*!IJ%~ ++!&'%/12478=>@CGJ%MQ^`cmr%v|} +,!,-56;<'%+.%02%478:= *u!gp|} *v!&A=5DF *~!{z +&(+0O+&!'+-2163<=B +'!][_a`ei *yo*z!;\\ *{!*) +&!PRW`\\l^jy +'!'+7; +1![\\ *-.+0!y~ +1!&)0 *k;+1!;=y%{~} +2!'.,*/4gqt~| +3!)*0 +,!>?%~ +-!&'%~ +.!&'%~ +/!&'%ntw~ +0!'+237DGI%KMPTV%Y\\efik%twxz%} +1!'(*%/2%:<>%CE%QS%UWXZ]%ac%fh%jnpqs%uwx| +2!&()+-0%35%=?BD%OQTVWY%[]_%dfh%prsu%{} +3!&(+%/1%;>%jmny%~ +4!&'%+/%14%8 .*f.+!Zv .,!oy .-!;<%>@BCGN%PRSV%X -R!XY%~ -S!&'%N")),t(e)});

打印相关的方法：

只要连接成功时，就直接传输数据给打印机。

methods: {
    //打印
    f_print(){
        this.sfShowTc=false;
        if (!Common.isExist(this.deviceId)) {
          this.openBlueTooth();
          this.isShowSearchBle=true;
          return;
        }else{
            console.log("有历史设备信息直接连接");
            this.createBLEConnectionWithDeviceId();
        }
      },
    // 小程序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
      createBLEConnectionWithDeviceId(){
          if (!Common.isExist(this.deviceId)) {
            return
          }
          uni.openBluetoothAdapter({
                success:(res) => {
                console.log("初始化蓝牙设备模块:"+JSON.stringify(res));
                if(res.errno==0){
                    this.connectBlue(this.deviceId,this.deviceName,null);
                }else{
                    Common.alert_duration(res.errMsg);
                }
                },
                fail: (res) => {
                    console.log("初始化蓝牙设备模块失败:"+JSON.stringify(res));
                    catchToast(res);
                    wx.onBluetoothAdapterStateChange((res) => {
                      console.log('onBluetoothAdapterStateChange', res)
                      if (res.available) {
                        // 取消监听
                        wx.onBluetoothAdapterStateChange(() => {
                        });
                        this.connectBlue(this.deviceId,this.deviceName,null);
                      }
                    })
                }
          });
      },
      //初始化蓝牙
      openBlueTooth(){
          if (!wx.openBluetoothAdapter) {
            wx.showModal({
              title: '提示',
              content: '当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。'
            })
            return
          }
          wx.openBluetoothAdapter({
                success:(res) => {
                console.log("初始化蓝牙设备模块:"+JSON.stringify(res));
                if(res.errno==0){
                    this.searchBlueToothDiscovery();
                }else{
                    Common.alert_duration(res.errMsg);
                }
                },
                fail: (res) => {
                    console.log("初始化蓝牙设备模块失败:"+JSON.stringify(res));
                    catchToast(res);
                    wx.onBluetoothAdapterStateChange((res) => {
                      console.log('onBluetoothAdapterStateChange', res)
                      if (res.available) {
                        // 取消监听，否则stopBluetoothDevicesDiscovery后仍会继续触发onBluetoothAdapterStateChange，
                        // 导致再次调用startBluetoothDevicesDiscovery
                        wx.onBluetoothAdapterStateChange(() => {
                        });
                        this.searchBlueToothDiscovery();
                      }
                    })
                }
          });
          wx.onBLEConnectionStateChange((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('onBLEConnectionStateChange', `device ${res.deviceId} state has changed, connected: ${res.connected}`)
            this.blueToothConnected = res.connected;
            if (!res.connected) {
              wx.showModal({
                title: '提示',
                content: '蓝牙连接已断开',
                showCancel: false
              });
            }
          });
      },
      //搜寻附近的蓝牙外围设备
      searchBlueToothDiscovery(){
          uni.startBluetoothDevicesDiscovery({
            success:(res) => {
                console.log("搜寻附近的蓝牙外围设备成功:"+JSON.stringify(res));
                if(res.errno==0){
                    wx.onBluetoothDeviceFound(this.onFoundDevice);
                }else{
                    catchToast(res);
                }
            },
            fail: (res) => {
                console.log("搜寻附近的蓝牙外围设备失败:"+JSON.stringify(res));
                catchToast(res);
            }
          });
      },
      //监听寻找到新设备的事件
      onBlueToothDeviceFound(){
          uni.onBluetoothDeviceFound(function (devices) {
            this.getBluetoothDevices();
          })
      },
      //获取在蓝牙模块生效期间所有已发现的蓝牙设备。包括已经和本机处于连接状态的设备
      getBluetoothDevices(){
          uni.getBluetoothDevices({
            success:(res) => {
                console.log("获取附近的蓝牙外围设备成功:"+JSON.stringify(res));
                if(res.errno==0){
                    this.devices=this.getNewDevicesList(res.devices);
                }else{
                    catchToast(res);
                }
            },
            fail: (res) => {
                console.log("获取附近的蓝牙外围设备失败:"+JSON.stringify(res));
                catchToast(res);
            }
          });
      },
      //获取设备列表
      getNewDevicesList(devices) {
          console.log("获取新的设备列表");
          const ids = [];
          //过滤无用蓝牙设备
          const devs = devices
              .filter((item) => !(item.RSSI > 0 || item.name.indexOf("T581")<0))
              .map((item) => {
                  ids.push(item.deviceId);
                  return {
                      rssi: item.RSSI,
                      name: item.name,
                      devId: item.deviceId,
                      status:false
                  };
              });
          //过滤重复
          const filterId = [...new Set(ids)];
          const newDevices = [];
          while (filterId.length) {
              const id = filterId.shift();
              for (let index = 0; index < devs.length; index++) {
                  const item = devs[index];
                  if (item.devId === id) {
                      newDevices.push(item);
                      break;
                  }
              }
          }
          return newDevices;
      },
      onFoundDevice: debounce(function(devices) {
          //获取搜寻的所有设备
          console.log("获取搜寻的所有设备");
          wxAsyncPromise('getBluetoothDevices').then((res) => {
              this.devices=this.getNewDevicesList(res.devices);
          });
      }, 60),
      onSearchDeviceFound(pro) {
          pro.then((res) => {
              console.log('初始化蓝牙成功');
              return wxAsyncPromise('startBluetoothDevicesDiscovery').then((res) => {
                  console.log('正在搜寻设备');
                  wx.showLoading({
                      title: '正在搜寻设备',
                      mask: false,
                  });
              });
          })
          .then((res) => {
              //监听寻找新设备
            console.log("监听寻找新设备")
              wx.onBluetoothDeviceFound(this.onFoundDevice);
          })
          .catch((res) => {
            console.log("监听寻找新设备异常："+JSON.stringify(res));
              catchToast(res);
            wx.setStorageSync(LAST_CONNECTED_DEVICE,"");
            this.deviceId="";
            this.deviceName = "";
          })
          .finally(() => {
              setTimeout(() => {
                  wx.hideToast();
              }, 300);
              // this.stopSearchBlue();
          });
      },
      //重新搜索蓝牙设备
      searchBlue() {
          wxAsyncPromise('closeBLEConnection', {
              deviceId: this.deviceId,
          }).finally((res) => {
              this.devices=[];
              this.deviceId="";
              this.deviceName="";
            this.blueToothConnected=false;
              wx.offBluetoothDeviceFound(this.onFoundDevice);
              //停止搜寻蓝牙
              wxAsyncPromise('stopBluetoothDevicesDiscovery').then(() => {
                  wx.getBluetoothAdapterState({
                      success: (res) => {
                          if (!res.available) {
                              //未打开蓝牙
                          } else if (!res.discovering) {
                              //没有在搜寻蓝牙情况
                              this.onSearchDeviceFound(Promise.resolve());
                          }
                      },
                      fail: (res) => {
                          if (res.errCode === 10000) {
                              this.openBlueTooth();
                          }
                      },
                  });
              });
          });
      },
      //停止搜索蓝牙设备
      stopSearchBlue() {
          console.log("停止搜索");
          wxAsyncPromise('stopBluetoothDevicesDiscovery');
      },
      onBlueChange(e,index) {
        const deviceId = e.devId;
        // if (this.deviceId === deviceId) return;
        this.deviceId="";
        this.deviceName="";
        this.blueToothConnected=false;
        this.connectBlue(deviceId,e.name,index);
      },
      //连接蓝牙
      connectBlue(deviceId,deviceName,index) {
          wx.showLoading({
              title: '正在连接'+deviceName,
              mask: true,
          });
          wxAsyncPromise('createBLEConnection', { deviceId })
              .then((res) => {
                  return wxAsyncPromise('getBLEDeviceServices', { deviceId });
              })
              .then((res) => {
                  console.log("获取蓝牙设备所有服务："+JSON.stringify(res.services));
                  this.services = res.services;
                  getDeviceCharacteristics(
                      deviceId,
                      [...this.services],
                      (character) => {
                          console.log("成功获取到特征值:"+JSON.stringify(character));
                          this.character = character;
                            this.deviceName= deviceName;
                            this.deviceId=deviceId;
                          this.blueToothConnected=true;
                          if(index!=null){
                              this.devices[index].status=true;
                          }
                          wx.setStorageSync(LAST_CONNECTED_DEVICE, this.deviceId+"&"+this.deviceName);
                          wx.hideLoading();
                          wx.offBluetoothDeviceFound(this.onFoundDevice);
                          wxAsyncPromise('stopBluetoothDevicesDiscovery');
                          // 延时调用
                          this.print();
                      },
                      (res) => {
                          console.log('获取设备特征值失败');
                          this.blueToothConnected=false;
                            Common.alert_duration("获取设备特征值失败");
                          wx.hideLoading();
                          this.isShowSearchBle=true;
                      },
                  );
              })
              .catch((res) => {
                  console.log('获取服务失败');
                  this.blueToothConnected=false;
                    Common.alert_duration("获取服务失败");
                  wx.hideLoading();
                  this.isShowSearchBle=true;
              });
      },
      print: debounce(function() {
          if (!Common.isExist(this.deviceId)) {
                wx.showToast({
                    title: '未连接任何蓝牙设备',
                    icon: 'none',
                });
                return;
            }
          wx.showLoading({
              title: '正在打印中......',
              mask: true,
          });
          const opt = { deviceId: this.deviceId, ...this.character };
          let _queue=[printCommand.clear];
          let line = GBK.encode('-------------------------------\r\n');
          let spaceStr = " ";
          let shName= this.blueToothPrintData.shName;
          let addressPhone=this.blueToothPrintData.xfSellerAddressPhone;
          _queue.push.apply(_queue, printCommand.center);
          console.log("开始组装打印数据")
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, GBK.encode(shName+"\n"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, line);
          _queue.push.apply(_queue, printCommand.left);
          _queue.push.apply(_queue, GBK.encode("消费单号："+this.blueToothPrintData.id+"\n"));
          let currentTime1=Common.changeDateFormat(new Date().getTime(),true);
          _queue.push.apply(_queue, GBK.encode("消费时间："+currentTime1+"\r\n"));
          _queue.push.apply(_queue, line);
          _queue.push.apply(_queue, GBK.encode('商品名称        数量       金额'));
          _queue.push.apply(_queue, printCommand.enter);
          let spList = this.selectSpArr;
          let sumSpNum=0;
          for (var i = 0; i < spList.length; i++) {
              let spmcSpaceNum = 16-Common.calculateStrLengh(spList[i].spmc);
              let spItemStr=spList[i].spmc;
              for (var j = 0; j < spmcSpaceNum; j++) {
                  spItemStr += spaceStr;
              }
              spItemStr += parseFloat(spList[i].spnum).toFixed(2);
              let spnumSpaceNum = 6-Common.calculateStrLengh(parseFloat(spList[i].spnum).toFixed(2));
              for (var k = 0; k < spnumSpaceNum; k++) {
                  spItemStr += spaceStr;
              }
              let spjeSpaceNum = 9-Common.calculateStrLengh(parseFloat(spList[i].spSumMoney).toFixed(2));
              for (var l = 0; l < spjeSpaceNum; l++) {
                  spItemStr += spaceStr;
              }
            spItemStr += parseFloat(spList[i].spSumMoney).toFixed(2);
              _queue.push.apply(_queue, GBK.encode(spItemStr));
              _queue.push.apply(_queue, printCommand.enter);
              sumSpNum = sumSpNum + spList[i].spnum;
          }
          _queue.push.apply(_queue, line);
          _queue.push.apply(_queue, GBK.encode("消费总计："+parseFloat(sumSpNum).toFixed(2)+"\r\n"));
          _queue.push.apply(_queue, GBK.encode("消费金额："+parseFloat(this.blueToothPrintData.spjsHj).toFixed(2)+"\r\n"));
          _queue.push.apply(_queue, GBK.encode("实付金额："+parseFloat(this.blueToothPrintData.actualAmount).toFixed(2)+"\r\n"));
          _queue.push.apply(_queue, line);
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, GBK.encode("地址："+this.blueToothPrintData.shdz+"\n"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, GBK.encode("联系电话："+this.userInfo.username+"\n"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, printCommand.center);
          _queue.push.apply(_queue, GBK.encode("扫码开票\n"));
          _queue.push.apply(_queue, [29, 119, 6]);//放大6倍二维码
          let qrContent="https://ksp.tbzhchina.com/invoiceadd?orderId=" + this.blueToothPrintData.id + "&sfJyToken=false";
          let qrCode1 = [29, 107, 97, 5, 1, new Uint8Array(GBK.encode(qrContent)).buffer.byteLength, 0];
          _queue.push.apply(_queue, qrCode1);
          _queue.push.apply(_queue, GBK.encode(qrContent));
          _queue.push.apply(_queue, GBK.encode("感谢您的惠顾"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, line);
          _queue.push.apply(_queue, GBK.encode("快闪票\r\n"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, GBK.encode("请在三日内开具发票，谢谢!\r\n"));
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, printCommand.enter);
          _queue.push.apply(_queue, GBK.encode("                               \r\n"));
          _queue.push.apply(_queue, line);
          console.log("开始发送打印数据")
          sendDataToDevice({
               ...opt,
               value: new Uint8Array(_queue).buffer,
               lasterSuccess: () => {
                   wx.hideLoading();
                   console.log("打印完成!")
                   this.orderId="";
                   this.spjeHj=0;
                   this.spseHj=0;
                   this.sumSpMoney="0";
                   this.selectSpArr = [];
                   this.isShowSearchBle=false;
                   Common.alert("打印成功!");
               },
          });
      }, 60),
}

注意点：getNewDevicesList 方法中，此处我们用的设备名称是 T581 开头的，所以我用名称过滤无用的设备信息，第二步根据设备ID过滤重复设备。

最后页面样式部分如下：

<style>
/*蓝牙配置弹窗-start*/
    .scrool-page {
      display: flex;
      flex-direction: column;
      width: 100%;
      height: 100%;
    }
    .panel-scroll-box {
      height: 85%;
      max-height: 350px;
      flex: 1;
      position: relative;
      margin-top: 10px;
      border-top: 1px solid #EEEEEE;
    }
    .bluetooth-item{
        border-bottom: 1px solid #EEEEEE;
    }
    .bluetooth-item:last-child{
        border-bottom: 0px solid #EEEEEE;
    }
    .empty-icon{
        margin-top: 20px;
        margin-bottom: 26upx;
    }
    .empty-text{
        width: 100%;
        line-height: 50upx;
        font-size: 30upx;
        text-align: center;
        color: #999999;
    }
   /* 列表--一行的样式 */
  .list-item-oneline {
    width: 100%;
    background-color: #FFFFFF;
    margin-bottom: 10px;
    height: 50px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0 15px;
    box-sizing: border-box;
  }
 
  .list-item-oneline .list-text {
    font-size: 16px;
    height: 20px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    flex: 1;
  }
 
  .list-item-oneline .list-statue {
    font-size: 12px;
    border: 1px solid #0faeff;
    padding: 1px 4px;
    border-radius: 3px;
    color: #0faeff;
    margin-left: 6px;
  }
    /*蓝牙配置弹窗-end*/
</style>

附带页面弹框效果图如下，第一个为没有可用设备时，第二个是有可用设备时：

如有问题，还请各位大佬多多指教，我是一名做后端 Java开发的程序猿，前端难免会有疏漏的部分。另外，有吉他或者民谣爱好者，可以关注我的微信公众号@民谣嗑学家，可以微信搜索：民谣嗑学家，帮我点个免费的关注，我是一名爱生活，爱代码，爱交朋友的热血青年，希望我们能够共同进步，共同成长。