uniapp微信小程序，实现nfc读取

let NFCAdapter = null;//NFCAdapter
let nowKey = '';
let mythis = null;

//读取 NFC 数据 uri 格式时，返回内容前缀会存在空字符（\u0000），
const removeNullCharacter = function(str) {
    return str.replace(/\\u([0-9]|[a-fA-F])([0-9]|[a-fA-F])([0-9]|[a-fA-F])([0-9]|[a-fA-F])/g, '')
};

/**
 * 字节对象转字符串
 * @param {Object} arr
 */
const byteToString = function(arr) {
    if (typeof arr === 'string') {
        return arr;
    }
    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 filterSpaces(str);
};
/**
 * 格式化得到aid值
 * @param {Object} buffer
 */
const ab2hex = function(buffer) {
    var hexArr = Array.prototype.map.call(
        new Uint8Array(buffer),

        function(bit) {
            return ('00' + bit.toString(16)).slice(-2);
        }
    );
    return hexArr.join('');
};
function filterSpaces(str) {
    return str.replace(/\s+/g, ''); // 使用正则表达式匹配空白字符，并替换为空字符串
}

export default {
    components: {
        CuCustom,
        UploadFile,
        Sigin,
    },
    data() {
        return {
        }
    },
    filters: {},
    computed: {},
    onLoad(opt) {

    },
    onShow() {
        mythis = this;
    },
    mounted() {

        if (NFCAdapter){
            NFCAdapter.offDiscovered(res => {
                console.log('mounted---->offDiscovered------->',res)
            })
            NFCAdapter.stopDiscovery(res => {
                console.log('mounted---->stopDiscovery------->',res)
            })
            NFCAdapter = null
        }


    },
    methods: {


        devTestJumpNfc(){
            //方便测试，所以在设置缓存键，值为1时，则绕过nfc验证
            if (uni.getStorageSync("useNfc") == '1'){
                this.nfcVerify = true;//验证通过，不使用nfc打开
            }
            return true
        },
        //打卡NFC识别--todo https://www.cnblogs.com/jopny/p/15309854.html
        openNfcVerify() {

            mythis.showNfcPopTips = true;
            NFCAdapter = wx.getNFCAdapter();
            console.log('NFCAdapter--->',NFCAdapter)
            // 绑定监听 NFC 标签
            NFCAdapter.onDiscovered(res => {
                // 监听到数据进行返回 根据返回的数据在进行 处理
                // console.log('绑定监听--->', res)

                //参考 https://blog.csdn.net/qq_42230395/article/details/112770872
                let aid = parseInt(ab2hex(res.id), 16);
                console.log('aid--->',aid)

                if (res.messages) {
                    let cordsArray = res.messages[0].records;
                    cordsArray.find(item => {
                        console.log('item--->',item)
                        let payload =byteToString(new Uint8Array(item.payload));
                        //场景一：zh123456,，文本内容其实是123456，前缀有zh代表中文
                        //场景二：123456,，文本内容无zh前缀
                        //
                        let id = byteToString(new Uint8Array(item.id));
                        let type = byteToString(new Uint8Array(item.type));

                        let txt = payload.split("zh");
                        console.log('txt--->',txt)
                        console.log('nowKey--->',nowKey)

                        if (txt.length>1){
                            if (nowKey != txt[1]) {
                                mythis.keyNum++;
                                mythis.$showToast('巡检点位不匹配，请检查');
                            } else {
                                setTimeout(() => {
                                    mythis.nfcCheckSuccess(txt[1])
                                }, 50)
                            }

                        }else {

                            if (payload == nowKey){
                                setTimeout(()=>{
                                    mythis.nfcCheckSuccess(payload)
                                },50)

                            }else {
                                mythis.$showToast('巡检点位不匹配，请检查');
                            }

                        }


                        console.log('-------开始读取标签-------')

                        console.log('payload--->',payload)
                        // console.log('nfcTxt--->',nfcTxt)
                        // console.log('id--->',id)
                        // console.log('type--->',type)
                        console.log('-------END-------')
                    });
                }else {
                    console.log('no---->messages')
                    mythis.$showToast('设备识别为空，请检查');
                }



            })
            // 开始监听
            NFCAdapter.startDiscovery({
                success(res) {
                    console.log('开始监听--->', res)
                },
                fail(err) {
                    console.log('NFC--->err:', err)
                    if (err.errCode == '13001'){
                        mythis.$showToast('系统NFC开关未打开，请检查');
                        mythis.tipsNfc = '系统NFC开关未打开，请检查'
                    }
                    if (err.errCode == '13000'){
                        mythis.$showToast('设备不支持NFC');
                        mythis.tipsNfc = '系设备不支持NFC'
                    }

                }
            })

        },
        nfcCheckSuccess(key){

            //设置nfc状态
            mythis.nfcVerify = true;
            uni.showToast({
                title: '识别成功',
                //将值设置为 success 或者直接不用写icon这个参数
                icon: 'success',
                //显示持续时间为 2秒
                duration: 2000
            });
            mythis.getSubInfoList(key);
            mythis.closeNfcVerify();//关闭弹窗
            return false;
        },
        //关闭nfc识别功能
        closeNfcVerify(){
            console.log('关闭closeNfcVerify--->',8888888)
            mythis.keyNum++;
            mythis.showNfcPopTips = false;
            const listener = function (res) { console.log('关闭nfc功能--->',res) }
            if (NFCAdapter){
                NFCAdapter.offDiscovered(res => {
                    console.log('offDiscovered------->',res)
                })
                NFCAdapter.stopDiscovery(res => {
                    console.log('stopDiscovery------->',res)
                })
            }
            NFCAdapter = null;
            // this.$forceUpdate();
        },




    },
    destroyed() {
        if (NFCAdapter){
            NFCAdapter.offDiscovered(res => {
                console.log('destroyed--->offDiscovered------->',res)
            })
            NFCAdapter.stopDiscovery(res => {
                console.log('destroyed--->stopDiscovery------->',res)
            })
            NFCAdapter = null
        }
    },

}