classroom-music-activation/miniprogram/utils/qrcode.js

//qrcode.js，复制下面代码粘贴即可
let QRCode = {};
(function () {
    /**
     * 获取单个字符的utf8编码
     * unicode BMP平面约65535个字符
     * @param {num} code
     * return {array}
     */
    function unicodeFormat8(code) {
        // 1 byte
        var c0, c1, c2;
        if (code < 128) {
            return [code];
            // 2 bytes
        } else if (code < 2048) {
            c0 = 192 + (code >> 6);
            c1 = 128 + (code & 63);
            return [c0, c1];
            // 3 bytes
        } else {
            c0 = 224 + (code >> 12);
            c1 = 128 + (code >> 6 & 63);
            c2 = 128 + (code & 63);
            return [c0, c1, c2];
        }
    }
    /**
     * 获取字符串的utf8编码字节串
     * @param {string} string
     * @return {array}
     */
    function getUTF8Bytes(string) {
        var utf8codes = [];
        for (var i = 0; i < string.length; i++) {
            var code = string.charCodeAt(i);
            var utf8 = unicodeFormat8(code);
            for (var j = 0; j < utf8.length; j++) {
                utf8codes.push(utf8[j]);
            }
        }
        return utf8codes;
    }
    /**
     * 二维码算法实现
     * @param {string} data              要编码的信息字符串
     * @param {num} errorCorrectLevel 纠错等级
     */
    function QRCodeAlg(data, errorCorrectLevel) {
        this.typeNumber = -1; //版本
        this.errorCorrectLevel = errorCorrectLevel;
        this.modules = null; //二维矩阵，存放最终结果
        this.moduleCount = 0; //矩阵大小
        this.dataCache = null; //数据缓存
        this.rsBlocks = null; //版本数据信息
        this.totalDataCount = -1; //可使用的数据量
        this.data = data;
        this.utf8bytes = getUTF8Bytes(data);
        this.make();
    }
    QRCodeAlg.prototype = {
        constructor: QRCodeAlg,
        /**
         * 获取二维码矩阵大小
         * @return {num} 矩阵大小
         */
        getModuleCount: function () {
            return this.moduleCount;
        },
        /**
         * 编码
         */
        make: function () {
            this.getRightType();
            this.dataCache = this.createData();
            this.createQrcode();
        },
        /**
         * 设置二位矩阵功能图形
         * @param  {bool} test 表示是否在寻找最好掩膜阶段
         * @param  {num} maskPattern 掩膜的版本
         */
        makeImpl: function (maskPattern) {
            this.moduleCount = this.typeNumber * 4 + 17;
            this.modules = new Array(this.moduleCount);
            for (var row = 0; row < this.moduleCount; row++) {
                this.modules[row] = new Array(this.moduleCount);
            }
            this.setupPositionProbePattern(0, 0);
            this.setupPositionProbePattern(this.moduleCount - 7, 0);
            this.setupPositionProbePattern(0, this.moduleCount - 7);
            this.setupPositionAdjustPattern();
            this.setupTimingPattern();
            this.setupTypeInfo(true, maskPattern);
            if (this.typeNumber >= 7) {
                this.setupTypeNumber(true);
            }
            this.mapData(this.dataCache, maskPattern);
        },
        /**
         * 设置二维码的位置探测图形
         * @param  {num} row 探测图形的中心横坐标
         * @param  {num} col 探测图形的中心纵坐标
         */
        setupPositionProbePattern: function (row, col) {
            for (var r = -1; r <= 7; r++) {
                if (row + r <= -1 || this.moduleCount <= row + r) continue;
                for (var c = -1; c <= 7; c++) {
                    if (col + c <= -1 || this.moduleCount <= col + c) continue;
                    if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
                        this.modules[row + r][col + c] = true;
                    } else {
                        this.modules[row + r][col + c] = false;
                    }
                }
            }
        },
        /**
         * 创建二维码
         * @return {[type]} [description]
         */
        createQrcode: function () {
            var minLostPoint = 0;
            var pattern = 0;
            var bestModules = null;
            for (var i = 0; i < 8; i++) {
                this.makeImpl(i);
                var lostPoint = QRUtil.getLostPoint(this);
                if (i == 0 || minLostPoint > lostPoint) {
                    minLostPoint = lostPoint;
                    pattern = i;
                    bestModules = this.modules;
                }
            }
            this.modules = bestModules;
            this.setupTypeInfo(false, pattern);
            if (this.typeNumber >= 7) {
                this.setupTypeNumber(false);
            }
        },
        /**
         * 设置定位图形
         * @return {[type]} [description]
         */
        setupTimingPattern: function () {
            for (var r = 8; r < this.moduleCount - 8; r++) {
                if (this.modules[r][6] != null) {
                    continue;
                }
                this.modules[r][6] = (r % 2 == 0);
                if (this.modules[6][r] != null) {
                    continue;
                }
                this.modules[6][r] = (r % 2 == 0);
            }
        },
        /**
         * 设置矫正图形
         * @return {[type]} [description]
         */
        setupPositionAdjustPattern: function () {
            var pos = QRUtil.getPatternPosition(this.typeNumber);
            for (var i = 0; i < pos.length; i++) {
                for (var j = 0; j < pos.length; j++) {
                    var row = pos[i];
                    var col = pos[j];
                    if (this.modules[row][col] != null) {
                        continue;
                    }
                    for (var r = -2; r <= 2; r++) {
                        for (var c = -2; c <= 2; c++) {
                            if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {
                                this.modules[row + r][col + c] = true;
                            } else {
                                this.modules[row + r][col + c] = false;
                            }
                        }
                    }
                }
            }
        },
        /**
         * 设置版本信息（7以上版本才有）
         * @param  {bool} test 是否处于判断最佳掩膜阶段
         * @return {[type]}      [description]
         */
        setupTypeNumber: function (test) {
            var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
            for (var i = 0; i < 18; i++) {
                var mod = (!test && ((bits >> i) & 1) == 1);
                this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
                this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
            }
        },
        /**
         * 设置格式信息（纠错等级和掩膜版本）
         * @param  {bool} test
         * @param  {num} maskPattern 掩膜版本
         * @return {}
         */
        setupTypeInfo: function (test, maskPattern) {
            var data = (QRErrorCorrectLevel[this.errorCorrectLevel] << 3) | maskPattern;
            var bits = QRUtil.getBCHTypeInfo(data);
            // vertical
            for (var i = 0; i < 15; i++) {
                var mod = (!test && ((bits >> i) & 1) == 1);
                if (i < 6) {
                    this.modules[i][8] = mod;
                } else if (i < 8) {
                    this.modules[i + 1][8] = mod;
                } else {
                    this.modules[this.moduleCount - 15 + i][8] = mod;
                }
                // horizontal
                var mod = (!test && ((bits >> i) & 1) == 1);
                if (i < 8) {
                    this.modules[8][this.moduleCount - i - 1] = mod;
                } else if (i < 9) {
                    this.modules[8][15 - i - 1 + 1] = mod;
                } else {
                    this.modules[8][15 - i - 1] = mod;
                }
            }
            // fixed module
            this.modules[this.moduleCount - 8][8] = (!test);
        },
        /**
         * 数据编码
         * @return {[type]} [description]
         */
        createData: function () {
            var buffer = new QRBitBuffer();
            var lengthBits = this.typeNumber > 9 ? 16 : 8;
            buffer.put(4, 4); //添加模式
            buffer.put(this.utf8bytes.length, lengthBits);
            for (var i = 0, l = this.utf8bytes.length; i < l; i++) {
                buffer.put(this.utf8bytes[i], 8);
            }
            if (buffer.length + 4 <= this.totalDataCount * 8) {
                buffer.put(0, 4);
            }
            // padding
            while (buffer.length % 8 != 0) {
                buffer.putBit(false);
            }
            // padding
            while (true) {
                if (buffer.length >= this.totalDataCount * 8) {
                    break;
                }
                buffer.put(QRCodeAlg.PAD0, 8);
                if (buffer.length >= this.totalDataCount * 8) {
                    break;
                }
                buffer.put(QRCodeAlg.PAD1, 8);
            }
            return this.createBytes(buffer);
        },
        /**
         * 纠错码编码
         * @param  {buffer} buffer 数据编码
         * @return {[type]}
         */
        createBytes: function (buffer) {
            var offset = 0;
            var maxDcCount = 0;
            var maxEcCount = 0;
            var length = this.rsBlock.length / 3;
            var rsBlocks = new Array();
            for (var i = 0; i < length; i++) {
                var count = this.rsBlock[i * 3 + 0];
                var totalCount = this.rsBlock[i * 3 + 1];
                var dataCount = this.rsBlock[i * 3 + 2];
                for (var j = 0; j < count; j++) {
                    rsBlocks.push([dataCount, totalCount]);
                }
            }
            var dcdata = new Array(rsBlocks.length);
            var ecdata = new Array(rsBlocks.length);
            for (var r = 0; r < rsBlocks.length; r++) {
                var dcCount = rsBlocks[r][0];
                var ecCount = rsBlocks[r][1] - dcCount;
                maxDcCount = Math.max(maxDcCount, dcCount);
                maxEcCount = Math.max(maxEcCount, ecCount);
                dcdata[r] = new Array(dcCount);
                for (var i = 0; i < dcdata[r].length; i++) {
                    dcdata[r][i] = 0xff & buffer.buffer[i + offset];
                }
                offset += dcCount;
                var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
                var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);
                var modPoly = rawPoly.mod(rsPoly);
                ecdata[r] = new Array(rsPoly.getLength() - 1);
                for (var i = 0; i < ecdata[r].length; i++) {
                    var modIndex = i + modPoly.getLength() - ecdata[r].length;
                    ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0;
                }
            }
            var data = new Array(this.totalDataCount);
            var index = 0;
            for (var i = 0; i < maxDcCount; i++) {
                for (var r = 0; r < rsBlocks.length; r++) {
                    if (i < dcdata[r].length) {
                        data[index++] = dcdata[r][i];
                    }
                }
            }
            for (var i = 0; i < maxEcCount; i++) {
                for (var r = 0; r < rsBlocks.length; r++) {
                    if (i < ecdata[r].length) {
                        data[index++] = ecdata[r][i];
                    }
                }
            }
            return data;
 
        },
        /**
         * 布置模块，构建最终信息
         * @param  {} data
         * @param  {} maskPattern
         * @return {}
         */
        mapData: function (data, maskPattern) {
            var inc = -1;
            var row = this.moduleCount - 1;
            var bitIndex = 7;
            var byteIndex = 0;
            for (var col = this.moduleCount - 1; col > 0; col -= 2) {
                if (col == 6) col--;
                while (true) {
                    for (var c = 0; c < 2; c++) {
                        if (this.modules[row][col - c] == null) {
                            var dark = false;
                            if (byteIndex < data.length) {
                                dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);
                            }
                            var mask = QRUtil.getMask(maskPattern, row, col - c);
                            if (mask) {
                                dark = !dark;
                            }
                            this.modules[row][col - c] = dark;
                            bitIndex--;
                            if (bitIndex == -1) {
                                byteIndex++;
                                bitIndex = 7;
                            }
                        }
                    }
                    row += inc;
                    if (row < 0 || this.moduleCount <= row) {
                        row -= inc;
                        inc = -inc;
                        break;
                    }
                }
            }
        }
    };
    /**
     * 填充字段
     */
    QRCodeAlg.PAD0 = 0xEC;
    QRCodeAlg.PAD1 = 0x11;
    //---------------------------------------------------------------------
    // 纠错等级对应的编码
    //---------------------------------------------------------------------
    var QRErrorCorrectLevel = [1, 0, 3, 2];
    //---------------------------------------------------------------------
    // 掩膜版本
    //---------------------------------------------------------------------
    var QRMaskPattern = {
        PATTERN000: 0,
        PATTERN001: 1,
        PATTERN010: 2,
        PATTERN011: 3,
        PATTERN100: 4,
        PATTERN101: 5,
        PATTERN110: 6,
        PATTERN111: 7
    };
    //---------------------------------------------------------------------
    // 工具类
    //---------------------------------------------------------------------
    var QRUtil = {
        /*
        每个版本矫正图形的位置
         */
        PATTERN_POSITION_TABLE: [
            [],
            [6, 18],
            [6, 22],
            [6, 26],
            [6, 30],
            [6, 34],
            [6, 22, 38],
            [6, 24, 42],
            [6, 26, 46],
            [6, 28, 50],
            [6, 30, 54],
            [6, 32, 58],
            [6, 34, 62],
            [6, 26, 46, 66],
            [6, 26, 48, 70],
            [6, 26, 50, 74],
            [6, 30, 54, 78],
            [6, 30, 56, 82],
            [6, 30, 58, 86],
            [6, 34, 62, 90],
            [6, 28, 50, 72, 94],
            [6, 26, 50, 74, 98],
            [6, 30, 54, 78, 102],
            [6, 28, 54, 80, 106],
            [6, 32, 58, 84, 110],
            [6, 30, 58, 86, 114],
            [6, 34, 62, 90, 118],
            [6, 26, 50, 74, 98, 122],
            [6, 30, 54, 78, 102, 126],
            [6, 26, 52, 78, 104, 130],
            [6, 30, 56, 82, 108, 134],
            [6, 34, 60, 86, 112, 138],
            [6, 30, 58, 86, 114, 142],
            [6, 34, 62, 90, 118, 146],
            [6, 30, 54, 78, 102, 126, 150],
            [6, 24, 50, 76, 102, 128, 154],
            [6, 28, 54, 80, 106, 132, 158],
            [6, 32, 58, 84, 110, 136, 162],
            [6, 26, 54, 82, 110, 138, 166],
            [6, 30, 58, 86, 114, 142, 170]
        ],
        G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
        G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
        G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),
        /*
        BCH编码格式信息
         */
        getBCHTypeInfo: function (data) {
            var d = data << 10;
            while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
                d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)));
            }
            return ((data << 10) | d) ^ QRUtil.G15_MASK;
        },
        /*
        BCH编码版本信息
         */
        getBCHTypeNumber: function (data) {
            var d = data << 12;
            while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
                d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)));
            }
            return (data << 12) | d;
        },
        /*
        获取BCH位信息
         */
        getBCHDigit: function (data) {
            var digit = 0;
            while (data != 0) {
                digit++;
                data >>>= 1;
            }
            return digit;
        },
        /*
        获取版本对应的矫正图形位置
         */
        getPatternPosition: function (typeNumber) {
            return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
        },
        /*
        掩膜算法
         */
        getMask: function (maskPattern, i, j) {
            switch (maskPattern) {
                case QRMaskPattern.PATTERN000:
                    return (i + j) % 2 == 0;
                case QRMaskPattern.PATTERN001:
                    return i % 2 == 0;
                case QRMaskPattern.PATTERN010:
                    return j % 3 == 0;
                case QRMaskPattern.PATTERN011:
                    return (i + j) % 3 == 0;
                case QRMaskPattern.PATTERN100:
                    return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
                case QRMaskPattern.PATTERN101:
                    return (i * j) % 2 + (i * j) % 3 == 0;
                case QRMaskPattern.PATTERN110:
                    return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
                case QRMaskPattern.PATTERN111:
                    return ((i * j) % 3 + (i + j) % 2) % 2 == 0;
                default:
                    throw new Error("bad maskPattern:" + maskPattern);
            }
        },
        /*
        获取RS的纠错多项式
         */
        getErrorCorrectPolynomial: function (errorCorrectLength) {
            var a = new QRPolynomial([1], 0);
            for (var i = 0; i < errorCorrectLength; i++) {
                a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));
            }
            return a;
        },
        /*
        获取评价
         */
        getLostPoint: function (qrCode) {
            var moduleCount = qrCode.getModuleCount(),
                lostPoint = 0,
                darkCount = 0;
            for (var row = 0; row < moduleCount; row++) {
                var sameCount = 0;
                var head = qrCode.modules[row][0];
                for (var col = 0; col < moduleCount; col++) {
                    var current = qrCode.modules[row][col];
                    //level 3 评价
                    if (col < moduleCount - 6) {
                        if (current && !qrCode.modules[row][col + 1] && qrCode.modules[row][col + 2] && qrCode.modules[row][col + 3] && qrCode.modules[row][col + 4] && !qrCode.modules[row][col + 5] && qrCode.modules[row][col + 6]) {
                            if (col < moduleCount - 10) {
                                if (qrCode.modules[row][col + 7] && qrCode.modules[row][col + 8] && qrCode.modules[row][col + 9] && qrCode.modules[row][col + 10]) {
                                    lostPoint += 40;
                                }
                            } else if (col > 3) {
                                if (qrCode.modules[row][col - 1] && qrCode.modules[row][col - 2] && qrCode.modules[row][col - 3] && qrCode.modules[row][col - 4]) {
                                    lostPoint += 40;
                                }
                            }
                        }
                    }
                    //level 2 评价
                    if ((row < moduleCount - 1) && (col < moduleCount - 1)) {
                        var count = 0;
                        if (current) count++;
                        if (qrCode.modules[row + 1][col]) count++;
                        if (qrCode.modules[row][col + 1]) count++;
                        if (qrCode.modules[row + 1][col + 1]) count++;
                        if (count == 0 || count == 4) {
                            lostPoint += 3;
                        }
                    }
                    //level 1 评价
                    if (head ^ current) {
                        sameCount++;
                    } else {
                        head = current;
                        if (sameCount >= 5) {
                            lostPoint += (3 + sameCount - 5);
                        }
                        sameCount = 1;
                    }
                    //level 4 评价
                    if (current) {
                        darkCount++;
                    }
                }
            }
            for (var col = 0; col < moduleCount; col++) {
                var sameCount = 0;
                var head = qrCode.modules[0][col];
                for (var row = 0; row < moduleCount; row++) {
                    var current = qrCode.modules[row][col];
                    //level 3 评价
                    if (row < moduleCount - 6) {
                        if (current && !qrCode.modules[row + 1][col] && qrCode.modules[row + 2][col] && qrCode.modules[row + 3][col] && qrCode.modules[row + 4][col] && !qrCode.modules[row + 5][col] && qrCode.modules[row + 6][col]) {
                            if (row < moduleCount - 10) {
                                if (qrCode.modules[row + 7][col] && qrCode.modules[row + 8][col] && qrCode.modules[row + 9][col] && qrCode.modules[row + 10][col]) {
                                    lostPoint += 40;
                                }
                            } else if (row > 3) {
                                if (qrCode.modules[row - 1][col] && qrCode.modules[row - 2][col] && qrCode.modules[row - 3][col] && qrCode.modules[row - 4][col]) {
                                    lostPoint += 40;
                                }
                            }
                        }
                    }
                    //level 1 评价
                    if (head ^ current) {
                        sameCount++;
                    } else {
                        head = current;
                        if (sameCount >= 5) {
                            lostPoint += (3 + sameCount - 5);
                        }
                        sameCount = 1;
                    }
                }
            }
            // LEVEL4
            var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
            lostPoint += ratio * 10;
            return lostPoint;
        }
 
    };
    //---------------------------------------------------------------------
    // QRMath使用的数学工具
    //---------------------------------------------------------------------
    var QRMath = {
        /*
        将n转化为a^m
         */
        glog: function (n) {
            if (n < 1) {
                throw new Error("glog(" + n + ")");
            }
            return QRMath.LOG_TABLE[n];
        },
        /*
        将a^m转化为n
         */
        gexp: function (n) {
            while (n < 0) {
                n += 255;
            }
            while (n >= 256) {
                n -= 255;
            }
            return QRMath.EXP_TABLE[n];
        },
        EXP_TABLE: new Array(256),
        LOG_TABLE: new Array(256)
 
    };
    for (var i = 0; i < 8; i++) {
        QRMath.EXP_TABLE[i] = 1 << i;
    }
    for (var i = 8; i < 256; i++) {
        QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];
    }
    for (var i = 0; i < 255; i++) {
        QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
    }
    //---------------------------------------------------------------------
    // QRPolynomial 多项式
    //---------------------------------------------------------------------
    /**
     * 多项式类
     * @param {Array} num   系数
     * @param {num} shift a^shift
     */
    function QRPolynomial(num, shift) {
        if (num.length == undefined) {
            throw new Error(num.length + "/" + shift);
        }
        var offset = 0;
        while (offset < num.length && num[offset] == 0) {
            offset++;
        }
        this.num = new Array(num.length - offset + shift);
        for (var i = 0; i < num.length - offset; i++) {
            this.num[i] = num[i + offset];
        }
    }
    QRPolynomial.prototype = {
        get: function (index) {
            return this.num[index];
        },
        getLength: function () {
            return this.num.length;
        },
        /**
         * 多项式乘法
         * @param  {QRPolynomial} e 被乘多项式
         * @return {[type]}   [description]
         */
        multiply: function (e) {
            var num = new Array(this.getLength() + e.getLength() - 1);
            for (var i = 0; i < this.getLength(); i++) {
                for (var j = 0; j < e.getLength(); j++) {
                    num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));
                }
            }
            return new QRPolynomial(num, 0);
        },
        /**
         * 多项式模运算
         * @param  {QRPolynomial} e 模多项式
         * @return {}
         */
        mod: function (e) {
            var tl = this.getLength(),
                el = e.getLength();
            if (tl - el < 0) {
                return this;
            }
            var num = new Array(tl);
            for (var i = 0; i < tl; i++) {
                num[i] = this.get(i);
            }
            while (num.length >= el) {
                var ratio = QRMath.glog(num[0]) - QRMath.glog(e.get(0));
 
                for (var i = 0; i < e.getLength(); i++) {
                    num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
                }
                while (num[0] == 0) {
                    num.shift();
                }
            }
            return new QRPolynomial(num, 0);
        }
    };
 
    //---------------------------------------------------------------------
    // RS_BLOCK_TABLE
    //---------------------------------------------------------------------
    /*
    二维码各个版本信息[块数, 每块中的数据块数, 每块中的信息块数]
     */
    var RS_BLOCK_TABLE = [
        // L
        // M
        // Q
        // H
        // 1
        [1, 26, 19],
        [1, 26, 16],
        [1, 26, 13],
        [1, 26, 9],
 
        // 2
        [1, 44, 34],
        [1, 44, 28],
        [1, 44, 22],
        [1, 44, 16],
 
        // 3
        [1, 70, 55],
        [1, 70, 44],
        [2, 35, 17],
        [2, 35, 13],
 
        // 4
        [1, 100, 80],
        [2, 50, 32],
        [2, 50, 24],
        [4, 25, 9],
 
        // 5
        [1, 134, 108],
        [2, 67, 43],
        [2, 33, 15, 2, 34, 16],
        [2, 33, 11, 2, 34, 12],
 
        // 6
        [2, 86, 68],
        [4, 43, 27],
        [4, 43, 19],
        [4, 43, 15],
 
        // 7
        [2, 98, 78],
        [4, 49, 31],
        [2, 32, 14, 4, 33, 15],
        [4, 39, 13, 1, 40, 14],
 
        // 8
        [2, 121, 97],
        [2, 60, 38, 2, 61, 39],
        [4, 40, 18, 2, 41, 19],
        [4, 40, 14, 2, 41, 15],
 
        // 9
        [2, 146, 116],
        [3, 58, 36, 2, 59, 37],
        [4, 36, 16, 4, 37, 17],
        [4, 36, 12, 4, 37, 13],
 
        // 10
        [2, 86, 68, 2, 87, 69],
        [4, 69, 43, 1, 70, 44],
        [6, 43, 19, 2, 44, 20],
        [6, 43, 15, 2, 44, 16],
 
        // 11
        [4, 101, 81],
        [1, 80, 50, 4, 81, 51],
        [4, 50, 22, 4, 51, 23],
        [3, 36, 12, 8, 37, 13],
 
        // 12
        [2, 116, 92, 2, 117, 93],
        [6, 58, 36, 2, 59, 37],
        [4, 46, 20, 6, 47, 21],
        [7, 42, 14, 4, 43, 15],
 
        // 13
        [4, 133, 107],
        [8, 59, 37, 1, 60, 38],
        [8, 44, 20, 4, 45, 21],
        [12, 33, 11, 4, 34, 12],
 
        // 14
        [3, 145, 115, 1, 146, 116],
        [4, 64, 40, 5, 65, 41],
        [11, 36, 16, 5, 37, 17],
        [11, 36, 12, 5, 37, 13],
 
        // 15
        [5, 109, 87, 1, 110, 88],
        [5, 65, 41, 5, 66, 42],
        [5, 54, 24, 7, 55, 25],
        [11, 36, 12],
 
        // 16
        [5, 122, 98, 1, 123, 99],
        [7, 73, 45, 3, 74, 46],
        [15, 43, 19, 2, 44, 20],
        [3, 45, 15, 13, 46, 16],
 
        // 17
        [1, 135, 107, 5, 136, 108],
        [10, 74, 46, 1, 75, 47],
        [1, 50, 22, 15, 51, 23],
        [2, 42, 14, 17, 43, 15],
 
        // 18
        [5, 150, 120, 1, 151, 121],
        [9, 69, 43, 4, 70, 44],
        [17, 50, 22, 1, 51, 23],
        [2, 42, 14, 19, 43, 15],
 
        // 19
        [3, 141, 113, 4, 142, 114],
        [3, 70, 44, 11, 71, 45],
        [17, 47, 21, 4, 48, 22],
        [9, 39, 13, 16, 40, 14],
 
        // 20
        [3, 135, 107, 5, 136, 108],
        [3, 67, 41, 13, 68, 42],
        [15, 54, 24, 5, 55, 25],
        [15, 43, 15, 10, 44, 16],
 
        // 21
        [4, 144, 116, 4, 145, 117],
        [17, 68, 42],
        [17, 50, 22, 6, 51, 23],
        [19, 46, 16, 6, 47, 17],
 
        // 22
        [2, 139, 111, 7, 140, 112],
        [17, 74, 46],
        [7, 54, 24, 16, 55, 25],
        [34, 37, 13],
 
        // 23
        [4, 151, 121, 5, 152, 122],
        [4, 75, 47, 14, 76, 48],
        [11, 54, 24, 14, 55, 25],
        [16, 45, 15, 14, 46, 16],
 
        // 24
        [6, 147, 117, 4, 148, 118],
        [6, 73, 45, 14, 74, 46],
        [11, 54, 24, 16, 55, 25],
        [30, 46, 16, 2, 47, 17],
 
        // 25
        [8, 132, 106, 4, 133, 107],
        [8, 75, 47, 13, 76, 48],
        [7, 54, 24, 22, 55, 25],
        [22, 45, 15, 13, 46, 16],
 
        // 26
        [10, 142, 114, 2, 143, 115],
        [19, 74, 46, 4, 75, 47],
        [28, 50, 22, 6, 51, 23],
        [33, 46, 16, 4, 47, 17],
 
        // 27
        [8, 152, 122, 4, 153, 123],
        [22, 73, 45, 3, 74, 46],
        [8, 53, 23, 26, 54, 24],
        [12, 45, 15, 28, 46, 16],
 
        // 28
        [3, 147, 117, 10, 148, 118],
        [3, 73, 45, 23, 74, 46],
        [4, 54, 24, 31, 55, 25],
        [11, 45, 15, 31, 46, 16],
 
        // 29
        [7, 146, 116, 7, 147, 117],
        [21, 73, 45, 7, 74, 46],
        [1, 53, 23, 37, 54, 24],
        [19, 45, 15, 26, 46, 16],
 
        // 30
        [5, 145, 115, 10, 146, 116],
        [19, 75, 47, 10, 76, 48],
        [15, 54, 24, 25, 55, 25],
        [23, 45, 15, 25, 46, 16],
 
        // 31
        [13, 145, 115, 3, 146, 116],
        [2, 74, 46, 29, 75, 47],
        [42, 54, 24, 1, 55, 25],
        [23, 45, 15, 28, 46, 16],
 
        // 32
        [17, 145, 115],
        [10, 74, 46, 23, 75, 47],
        [10, 54, 24, 35, 55, 25],
        [19, 45, 15, 35, 46, 16],
 
        // 33
        [17, 145, 115, 1, 146, 116],
        [14, 74, 46, 21, 75, 47],
        [29, 54, 24, 19, 55, 25],
        [11, 45, 15, 46, 46, 16],
 
        // 34
        [13, 145, 115, 6, 146, 116],
        [14, 74, 46, 23, 75, 47],
        [44, 54, 24, 7, 55, 25],
        [59, 46, 16, 1, 47, 17],
 
        // 35
        [12, 151, 121, 7, 152, 122],
        [12, 75, 47, 26, 76, 48],
        [39, 54, 24, 14, 55, 25],
        [22, 45, 15, 41, 46, 16],
 
        // 36
        [6, 151, 121, 14, 152, 122],
        [6, 75, 47, 34, 76, 48],
        [46, 54, 24, 10, 55, 25],
        [2, 45, 15, 64, 46, 16],
 
        // 37
        [17, 152, 122, 4, 153, 123],
        [29, 74, 46, 14, 75, 47],
        [49, 54, 24, 10, 55, 25],
        [24, 45, 15, 46, 46, 16],
 
        // 38
        [4, 152, 122, 18, 153, 123],
        [13, 74, 46, 32, 75, 47],
        [48, 54, 24, 14, 55, 25],
        [42, 45, 15, 32, 46, 16],
 
        // 39
        [20, 147, 117, 4, 148, 118],
        [40, 75, 47, 7, 76, 48],
        [43, 54, 24, 22, 55, 25],
        [10, 45, 15, 67, 46, 16],
 
        // 40
        [19, 148, 118, 6, 149, 119],
        [18, 75, 47, 31, 76, 48],
        [34, 54, 24, 34, 55, 25],
        [20, 45, 15, 61, 46, 16]
    ];
 
    /**
     * 根据数据获取对应版本
     * @return {[type]} [description]
     */
    QRCodeAlg.prototype.getRightType = function () {
        for (var typeNumber = 1; typeNumber < 41; typeNumber++) {
            var rsBlock = RS_BLOCK_TABLE[(typeNumber - 1) * 4 + this.errorCorrectLevel];
            if (rsBlock == undefined) {
                throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + this.errorCorrectLevel);
            }
            var length = rsBlock.length / 3;
            var totalDataCount = 0;
            for (var i = 0; i < length; i++) {
                var count = rsBlock[i * 3 + 0];
                var dataCount = rsBlock[i * 3 + 2];
                totalDataCount += dataCount * count;
            }
            var lengthBytes = typeNumber > 9 ? 2 : 1;
            if (this.utf8bytes.length + lengthBytes < totalDataCount || typeNumber == 40) {
                this.typeNumber = typeNumber;
                this.rsBlock = rsBlock;
                this.totalDataCount = totalDataCount;
                break;
            }
        }
    };
 
    //---------------------------------------------------------------------
    // QRBitBuffer
    //---------------------------------------------------------------------
    function QRBitBuffer() {
        this.buffer = new Array();
        this.length = 0;
    }
    QRBitBuffer.prototype = {
        get: function (index) {
            var bufIndex = Math.floor(index / 8);
            return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1);
        },
        put: function (num, length) {
            for (var i = 0; i < length; i++) {
                this.putBit(((num >>> (length - i - 1)) & 1));
            }
        },
        putBit: function (bit) {
            var bufIndex = Math.floor(this.length / 8);
            if (this.buffer.length <= bufIndex) {
                this.buffer.push(0);
            }
            if (bit) {
                this.buffer[bufIndex] |= (0x80 >>> (this.length % 8));
            }
            this.length++;
        }
    };
 
 
 
    // xzedit
    let qrcodeAlgObjCache = [];
    /**
     * 二维码构造函数，主要用于绘制
     * @param  {参数列表} opt 传递参数
     * @return {}
     */
    var options;
    QRCode = function (opt) {
        //设置默认参数
         options = {
            text: '',
            size: 256,
            correctLevel: 3,
            background: '#ffffff',
            foreground: '#000000',
            pdground: '#000000',
            image: '',
            imageSize: 30,
            canvasId: opt.canvasId,
            context: opt.context,
            usingComponents: opt.usingComponents,
            showLoading: opt.showLoading,
            loadingText: opt.loadingText,
        };
        if (typeof opt === 'string') { // 只编码ASCII字符串
            opt = {
                text: opt
            };
        }
        if (opt) {
            for (var i in opt) {
                options[i] = opt[i];
            }
        }
        //使用QRCodeAlg创建二维码结构
        var qrCodeAlg = null;
        for (var i = 0, l = qrcodeAlgObjCache.length; i < l; i++) {
            if (qrcodeAlgObjCache[i].text == options.text && qrcodeAlgObjCache[i].text.correctLevel == options.correctLevel) {
                qrCodeAlg = qrcodeAlgObjCache[i].obj;
                break;
            }
        }
        if (i == l) {
            qrCodeAlg = new QRCodeAlg(options.text, options.correctLevel);
            qrcodeAlgObjCache.push({
                text: options.text,
                correctLevel: options.correctLevel,
                obj: qrCodeAlg
            });
        }
        /**
         * 计算矩阵点的前景色
         * @param {Obj} config
         * @param {Number} config.row 点x坐标
         * @param {Number} config.col 点y坐标
         * @param {Number} config.count 矩阵大小
         * @param {Number} config.options 组件的options
         * @return {String}
         */
        let getForeGround = function (config) {
            var options = config.options;
            if (options.pdground && (
                (config.row > 1 && config.row < 5 && config.col > 1 && config.col < 5) ||
                (config.row > (config.count - 6) && config.row < (config.count - 2) && config.col > 1 && config.col < 5) ||
                (config.row > 1 && config.row < 5 && config.col > (config.count - 6) && config.col < (config.count - 2))
            )) {
                return options.pdground;
            }
            return options.foreground;
        }
        // 创建canvas
        let createCanvas = function (options) {
            if (options.showLoading) {
                wx.showLoading({
                    title: options.loadingText,
                    mask: true
                });
            }
            var ctx = wx.createCanvasContext(options.canvasId, options.context);
            var count = qrCodeAlg.getModuleCount();
            var ratioSize = options.size;
            var ratioImgSize = options.imageSize;
            //计算每个点的长宽
            var tileW = (ratioSize / count).toPrecision(4);
            var tileH = (ratioSize / count).toPrecision(4);
            //绘制
            for (var row = 0; row < count; row++) {
                for (var col = 0; col < count; col++) {
                    var w = (Math.ceil((col + 1) * tileW) - Math.floor(col * tileW));
                    var h = (Math.ceil((row + 1) * tileW) - Math.floor(row * tileW));
                    var foreground = getForeGround({
                        row: row,
                        col: col,
                        count: count,
                        options: options
                    });
                    ctx.setFillStyle(qrCodeAlg.modules[row][col] ? foreground : options.background);
                    ctx.fillRect(Math.round(col * tileW), Math.round(row * tileH), w, h);
                }
            }
            if (options.image) {
                var x = Number(((ratioSize - ratioImgSize) / 2).toFixed(2));
                var y = Number(((ratioSize - ratioImgSize) / 2).toFixed(2));
                drawRoundedRect(ctx, x, y, ratioImgSize, ratioImgSize, 2, 6, true, true)
                ctx.drawImage(options.image, x, y, ratioImgSize, ratioImgSize);
                // 画圆角矩形
                function drawRoundedRect(ctxi, x, y, width, height, r, lineWidth, fill, stroke) {
                    ctxi.setLineWidth(lineWidth);
                    ctxi.setFillStyle(options.background);
                    ctxi.setStrokeStyle(options.background);
                    ctxi.beginPath(); // draw top and top right corner 
                    ctxi.moveTo(x + r, y);
                    ctxi.arcTo(x + width, y, x + width, y + r, r); // draw right side and bottom right corner 
                    ctxi.arcTo(x + width, y + height, x + width - r, y + height, r); // draw bottom and bottom left corner 
                    ctxi.arcTo(x, y + height, x, y + height - r, r); // draw left and top left corner 
                    ctxi.arcTo(x, y, x + r, y, r);
                    ctxi.closePath();
                    if (fill) {
                        ctxi.fill();
                    }
                    if (stroke) {
                        ctxi.stroke();
                    }
                }
            }
            setTimeout(() => {
                ctx.draw(true, () => {
                    // 保存到临时区域
                    setTimeout(() => {
                        wx.canvasToTempFilePath({
                            width: options.width,
                            height: options.height,
                            destWidth: options.width,
                            destHeight: options.height,
                            canvasId: options.canvasId,
                            quality: Number(1),
                            success: function (res) {
                                if (options.cbResult) {
                                    options.cbResult(res.tempFilePath)
                                }
                            },
                            fail: function (res) {
                                if (options.cbResult) {
                                    options.cbResult(res)
                                }
                            },
                            complete: function () {
                                if (options.showLoading){
                                    wx.hideLoading();
                                }
                            },
                        }, options.context);
                    }, options.text.length + 100);
                });
            }, options.usingComponents ? 0 : 150);
        }
        createCanvas(options);
        // 空判定
        let empty = function (v) {
            let tp = typeof v,
                rt = false;
            if (tp == "number" && String(v) == "") {
                rt = true
            } else if (tp == "undefined") {
                rt = true
            } else if (tp == "object") {
                if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true
            } else if (tp == "string") {
                if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true
            } else if (tp == "function") {
                rt = false
            }
            return rt
        }
    };
    QRCode.prototype.clear = function (fn) {
        var ctx = wx.createCanvasContext(options.canvasId, options.context)
        ctx.clearRect(0, 0, options.size, options.size)
        ctx.draw(false, () => {
            if (fn) {
                fn()
            }
        })
    };
})()
 
export default QRCode