js 生成二维码实例

效果图附上：

代码附上：

qrcode.js

/*from tccdn minify at 2014-6-4 14:59:43,file：/cn/c/c/qrcode.js*/
/**
 * @fileoverview
 * - Using the 'QRCode for Javascript library'
 * - Fixed dataset of 'QRCode for Javascript library' for support full-spec.
 * - this library has no dependencies.
 * 
 * @author davidshimjs
 * @see http://www.d-project.com/
 * @see http://jeromeetienne.github.com/jquery-qrcode/
 */
var QRCode;

(function () {
    //---------------------------------------------------------------------
    // QRCode for JavaScript
    //
    // Copyright (c) 2009 Kazuhiko Arase
    //
    // URL: http://www.d-project.com/
    //
    // Licensed under the MIT license:
    //   http://www.opensource.org/licenses/mit-license.php
    //
    // The word "QR Code" is registered trademark of 
    // DENSO WAVE INCORPORATED
    //   http://www.denso-wave.com/qrcode/faqpatent-e.html
    //
    //---------------------------------------------------------------------
    function QR8bitByte(data) {
        this.mode = QRMode.MODE_8BIT_BYTE;
        this.data = data;
        this.parsedData = [];

        // Added to support UTF-8 Characters
        for (var i = 0, l = this.data.length; i < l; i++) {
            var byteArray = [];
            var code = this.data.charCodeAt(i);

            if (code > 0x10000) {
                byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
                byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
                byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
                byteArray[3] = 0x80 | (code & 0x3F);
            } else if (code > 0x800) {
                byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
                byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
                byteArray[2] = 0x80 | (code & 0x3F);
            } else if (code > 0x80) {
                byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
                byteArray[1] = 0x80 | (code & 0x3F);
            } else {
                byteArray[0] = code;
            }

            this.parsedData.push(byteArray);
        }

        this.parsedData = Array.prototype.concat.apply([], this.parsedData);

        if (this.parsedData.length != this.data.length) {
            this.parsedData.unshift(191);
            this.parsedData.unshift(187);
            this.parsedData.unshift(239);
        }
    }

    QR8bitByte.prototype = {
        getLength: function (buffer) {
            return this.parsedData.length;
        },
        write: function (buffer) {
            for (var i = 0, l = this.parsedData.length; i < l; i++) {
                buffer.put(this.parsedData[i], 8);
            }
        }
    };

    function QRCodeModel(typeNumber, errorCorrectLevel) {
        this.typeNumber = typeNumber;
        this.errorCorrectLevel = errorCorrectLevel;
        this.modules = null;
        this.moduleCount = 0;
        this.dataCache = null;
        this.dataList = [];
    }

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];
}

function QRRSBlock(totalCount, dataCount) {
    this.totalCount = totalCount, this.dataCount = dataCount;
}

function QRBitBuffer() {
    this.buffer = [], this.length = 0;
}

    QRCodeModel.prototype = {
        "addData": function(data) {
            var newData = new QR8bitByte(data);
            this.dataList.push(newData), this.dataCache = null;
        },
        "isDark": function(row, col) {
            if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) throw new Error(row + "," + col);
            return this.modules[row][col];
        },
        "getModuleCount": function() {
            return this.moduleCount;
        },
        "make": function() {
            this.makeImpl(!1, this.getBestMaskPattern());
        },
        "makeImpl": function(test, 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);
                for (var col = 0; col < this.moduleCount; col++) this.modules[row][col] = null;
            }
            this.setupPositionProbePattern(0, 0),
            this.setupPositionProbePattern(this.moduleCount - 7, 0),
            this.setupPositionProbePattern(0, this.moduleCount - 7),
            this.setupPositionAdjustPattern(), this.setupTimingPattern(),
            this.setupTypeInfo(test, maskPattern),
            this.typeNumber >= 7 && this.setupTypeNumber(test),
            this.dataCache == null && (this.dataCache = QRCodeModel.createData(this.typeNumber, this.errorCorrectLevel, this.dataList)), this.mapData(this.dataCache, maskPattern);
        },
        "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;
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] = !0 : this.modules[row + r][col + c] = !1;
                }
            }
        },
        "getBestMaskPattern": function() {
            var minLostPoint = 0, pattern = 0;
            for (var i = 0; i < 8; i++) {
                this.makeImpl(!0, i);
                var lostPoint = QRUtil.getLostPoint(this);
                if (i == 0 || minLostPoint > lostPoint) minLostPoint = lostPoint, pattern = i;
            }
            return pattern;
        },
        "createMovieClip": function(target_mc, instance_name, depth) {
            var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth), cs = 1;
            this.make();
            for (var row = 0; row < this.modules.length; row++) {
                var y = row * cs;
                for (var col = 0; col < this.modules[row].length; col++) {
                    var x = col * cs, dark = this.modules[row][col];
                    dark && (qr_mc.beginFill(0, 100), qr_mc.moveTo(x, y), qr_mc.lineTo(x + cs, y), qr_mc.lineTo(x + cs, y + cs), qr_mc.lineTo(x, y + cs), qr_mc.endFill());
                }
            }
            return qr_mc;
        },
        "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;
            }
            for (var c = 8; c < this.moduleCount - 8; c++) {
                if (this.modules[6][c] != null) continue;
                this.modules[6][c] = c % 2 == 0;
            }
        },
        "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], col = pos[j];
                if (this.modules[row][col] != null) continue;
                for (var r = -2; r <= 2; r++) for (var c = -2; c <= 2; c++) r == -2 || r == 2 || c == -2 || c == 2 || r == 0 && c == 0 ? this.modules[row + r][col + c] = !0 : this.modules[row + r][col + c] = !1;
            }
        },
        "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;
            }
            for (var i = 0; i < 18; i++) {
                var mod = !test && (bits >> i & 1) == 1;
                this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
            }
        },
        "setupTypeInfo": function(test, maskPattern) {
            var data = this.errorCorrectLevel << 3 | maskPattern, bits = QRUtil.getBCHTypeInfo(data);
            for (var i = 0; i < 15; i++) {
                var mod = !test && (bits >> i & 1) == 1;
                i < 6 ? this.modules[i][8] = mod : i < 8 ? this.modules[i + 1][8] = mod : this.modules[this.moduleCount - 15 + i][8] = mod;
            }
            for (var i = 0; i < 15; i++) {
                var mod = !test && (bits >> i & 1) == 1;
                i < 8 ? this.modules[8][this.moduleCount - i - 1] = mod : i < 9 ? this.modules[8][15 - i - 1 + 1] = mod : this.modules[8][15 - i - 1] = mod;
            }
            this.modules[this.moduleCount - 8][8] = !test;
        },
        "mapData": function(data, maskPattern) {
            var inc = -1, row = this.moduleCount - 1, bitIndex = 7, byteIndex = 0;
            for (var col = this.moduleCount - 1; col > 0; col -= 2) {
                col == 6 && col--;
                for (;;) {
                    for (var c = 0; c < 2; c++) if (this.modules[row][col - c] == null) {
                        var dark = !1;
                        byteIndex < data.length && (dark = (data[byteIndex] >>> bitIndex & 1) == 1);
                        var mask = QRUtil.getMask(maskPattern, row, col - c);
                        mask && (dark = !dark), this.modules[row][col - c] = dark, bitIndex--, bitIndex == -1 && (byteIndex++, bitIndex = 7);
                    }
                    row += inc;
                    if (row < 0 || this.moduleCount <= row) {
                        row -= inc, inc = -inc;
                        break;
                    }
                }
            }
        }
    }, QRCodeModel.PAD0 = 236, QRCodeModel.PAD1 = 17, QRCodeModel.createData = function(typeNumber, errorCorrectLevel, dataList) {
        var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel), buffer = new QRBitBuffer;
        for (var i = 0; i < dataList.length; i++) {
            var data = dataList[i];
            buffer.put(data.mode, 4), buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber)), data.write(buffer);
        }
        var totalDataCount = 0;
        for (var i = 0; i < rsBlocks.length; i++) totalDataCount += rsBlocks[i].dataCount;
        if (buffer.getLengthInBits() > totalDataCount * 8) throw new Error("code length overflow. (" + buffer.getLengthInBits() + ">" + totalDataCount * 8 + ")");
        buffer.getLengthInBits() + 4 <= totalDataCount * 8 && buffer.put(0, 4);
        while (buffer.getLengthInBits() % 8 != 0) buffer.putBit(!1);
        for (;;) {
            if (buffer.getLengthInBits() >= totalDataCount * 8) break;
            buffer.put(QRCodeModel.PAD0, 8);
            if (buffer.getLengthInBits() >= totalDataCount * 8) break;
            buffer.put(QRCodeModel.PAD1, 8);
        }
        return QRCodeModel.createBytes(buffer, rsBlocks);
    }, QRCodeModel.createBytes = function(buffer, rsBlocks) {
        var offset = 0, maxDcCount = 0, maxEcCount = 0, dcdata = new Array(rsBlocks.length), ecdata = new Array(rsBlocks.length);
        for (var r = 0; r < rsBlocks.length; r++) {
            var dcCount = rsBlocks[r].dataCount, ecCount = rsBlocks[r].totalCount - 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] = 255 & buffer.buffer[i + offset];
            offset += dcCount;
            var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount), rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1), 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 totalCodeCount = 0;
        for (var i = 0; i < rsBlocks.length; i++) totalCodeCount += rsBlocks[i].totalCount;
        var data = new Array(totalCodeCount), index = 0;
        for (var i = 0; i < maxDcCount; i++) for (var r = 0; r < rsBlocks.length; r++) i < dcdata[r].length && (data[index++] = dcdata[r][i]);
        for (var i = 0; i < maxEcCount; i++) for (var r = 0; r < rsBlocks.length; r++) i < ecdata[r].length && (data[index++] = ecdata[r][i]);
        return data;
    };

    var QRMode = {
        "MODE_NUMBER": 1,
        "MODE_ALPHA_NUM": 2,
        "MODE_8BIT_BYTE": 4,
        "MODE_KANJI": 8
    }, QRErrorCorrectLevel = {
        "L": 1,
        "M": 0,
        "Q": 3,
        "H": 2
    }, QRMaskPattern = {
        "PATTERN000": 0,
        "PATTERN001": 1,
        "PATTERN010": 2,
        "PATTERN011": 3,
        "PATTERN100": 4,
        "PATTERN101": 5,
        "PATTERN110": 6,
        "PATTERN111": 7
    }, QRUtil = {
        "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": 1335,
        "G18": 7973,
        "G15_MASK": 21522,
        "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;
        },
        "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;
        },
        "getBCHDigit": function(data) {
            var digit = 0;
            while (data != 0) digit++, data >>>= 1;
            return digit;
        },
        "getPatternPosition": function(typeNumber) {
            return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
        },
        "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);
            }
        },
        "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;
        },
        "getLengthInBits": function(mode, type) {
            if (1 <= type && type < 10) switch (mode) {
              case QRMode.MODE_NUMBER:
                return 10;
              case QRMode.MODE_ALPHA_NUM:
                return 9;
              case QRMode.MODE_8BIT_BYTE:
                return 8;
              case QRMode.MODE_KANJI:
                return 8;
              default:
                throw new Error("mode:" + mode);
            } else if (type < 27) switch (mode) {
              case QRMode.MODE_NUMBER:
                return 12;
              case QRMode.MODE_ALPHA_NUM:
                return 11;
              case QRMode.MODE_8BIT_BYTE:
                return 16;
              case QRMode.MODE_KANJI:
                return 10;
              default:
                throw new Error("mode:" + mode);
            } else {
                if (!(type < 41)) throw new Error("type:" + type);
                switch (mode) {
                  case QRMode.MODE_NUMBER:
                    return 14;
                  case QRMode.MODE_ALPHA_NUM:
                    return 13;
                  case QRMode.MODE_8BIT_BYTE:
                    return 16;
                  case QRMode.MODE_KANJI:
                    return 12;
                  default:
                    throw new Error("mode:" + mode);
                }
            }
        },
        "getLostPoint": function(qrCode) {
            var moduleCount = qrCode.getModuleCount(), lostPoint = 0;
            for (var row = 0; row < moduleCount; row++) for (var col = 0; col < moduleCount; col++) {
                var sameCount = 0, dark = qrCode.isDark(row, col);
                for (var r = -1; r <= 1; r++) {
                    if (row + r < 0 || moduleCount <= row + r) continue;
                    for (var c = -1; c <= 1; c++) {
                        if (col + c < 0 || moduleCount <= col + c) continue;
                        if (r == 0 && c == 0) continue;
                        dark == qrCode.isDark(row + r, col + c) && sameCount++;
                    }
                }
                sameCount > 5 && (lostPoint += 3 + sameCount - 5);
            }
            for (var row = 0; row < moduleCount - 1; row++) for (var col = 0; col < moduleCount - 1; col++) {
                var count = 0;
                qrCode.isDark(row, col) && count++, qrCode.isDark(row + 1, col) && count++, qrCode.isDark(row, col + 1) && count++, qrCode.isDark(row + 1, col + 1) && count++;
                if (count == 0 || count == 4) lostPoint += 3;
            }
            for (var row = 0; row < moduleCount; row++) for (var col = 0; col < moduleCount - 6; col++) qrCode.isDark(row, col) && !qrCode.isDark(row, col + 1) && qrCode.isDark(row, col + 2) && qrCode.isDark(row, col + 3) && qrCode.isDark(row, col + 4) && !qrCode.isDark(row, col + 5) && qrCode.isDark(row, col + 6) && (lostPoint += 40);
            for (var col = 0; col < moduleCount; col++) for (var row = 0; row < moduleCount - 6; row++) qrCode.isDark(row, col) && !qrCode.isDark(row + 1, col) && qrCode.isDark(row + 2, col) && qrCode.isDark(row + 3, col) && qrCode.isDark(row + 4, col) && !qrCode.isDark(row + 5, col) && qrCode.isDark(row + 6, col) && (lostPoint += 40);
            var darkCount = 0;
            for (var col = 0; col < moduleCount; col++) for (var row = 0; row < moduleCount; row++) qrCode.isDark(row, col) && darkCount++;
            var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
            return lostPoint += ratio * 10, lostPoint;
        }
    }, QRMath = {
        "glog": function(n) {
            if (n < 1) throw new Error("glog(" + n + ")");
            return QRMath.LOG_TABLE[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.prototype = {
        "get": function(index) {
            return this.num[index];
        },
        "getLength": function() {
            return this.num.length;
        },
        "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);
        },
        "mod": function(e) {
            if (this.getLength() - e.getLength() < 0) return this;
            var ratio = QRMath.glog(this.get(0)) - QRMath.glog(e.get(0)), num = new Array(this.getLength());
            for (var i = 0; i < this.getLength(); i++) num[i] = this.get(i);
            for (var i = 0; i < e.getLength(); i++) num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
            return (new QRPolynomial(num, 0)).mod(e);
        }
    }, QRRSBlock.RS_BLOCK_TABLE = [ [ 1, 26, 19 ], [ 1, 26, 16 ], [ 1, 26, 13 ], [ 1, 26, 9 ], [ 1, 44, 34 ], [ 1, 44, 28 ], [ 1, 44, 22 ], [ 1, 44, 16 ], [ 1, 70, 55 ], [ 1, 70, 44 ], [ 2, 35, 17 ], [ 2, 35, 13 ], [ 1, 100, 80 ], [ 2, 50, 32 ], [ 2, 50, 24 ], [ 4, 25, 9 ], [ 1, 134, 108 ], [ 2, 67, 43 ], [ 2, 33, 15, 2, 34, 16 ], [ 2, 33, 11, 2, 34, 12 ], [ 2, 86, 68 ], [ 4, 43, 27 ], [ 4, 43, 19 ], [ 4, 43, 15 ], [ 2, 98, 78 ], [ 4, 49, 31 ], [ 2, 32, 14, 4, 33, 15 ], [ 4, 39, 13, 1, 40, 14 ], [ 2, 121, 97 ], [ 2, 60, 38, 2, 61, 39 ], [ 4, 40, 18, 2, 41, 19 ], [ 4, 40, 14, 2, 41, 15 ], [ 2, 146, 116 ], [ 3, 58, 36, 2, 59, 37 ], [ 4, 36, 16, 4, 37, 17 ], [ 4, 36, 12, 4, 37, 13 ], [ 2, 86, 68, 2, 87, 69 ], [ 4, 69, 43, 1, 70, 44 ], [ 6, 43, 19, 2, 44, 20 ], [ 6, 43, 15, 2, 44, 16 ], [ 4, 101, 81 ], [ 1, 80, 50, 4, 81, 51 ], [ 4, 50, 22, 4, 51, 23 ], [ 3, 36, 12, 8, 37, 13 ], [ 2, 116, 92, 2, 117, 93 ], [ 6, 58, 36, 2, 59, 37 ], [ 4, 46, 20, 6, 47, 21 ], [ 7, 42, 14, 4, 43, 15 ], [ 4, 133, 107 ], [ 8, 59, 37, 1, 60, 38 ], [ 8, 44, 20, 4, 45, 21 ], [ 12, 33, 11, 4, 34, 12 ], [ 3, 145, 115, 1, 146, 116 ], [ 4, 64, 40, 5, 65, 41 ], [ 11, 36, 16, 5, 37, 17 ], [ 11, 36, 12, 5, 37, 13 ], [ 5, 109, 87, 1, 110, 88 ], [ 5, 65, 41, 5, 66, 42 ], [ 5, 54, 24, 7, 55, 25 ], [ 11, 36, 12 ], [ 5, 122, 98, 1, 123, 99 ], [ 7, 73, 45, 3, 74, 46 ], [ 15, 43, 19, 2, 44, 20 ], [ 3, 45, 15, 13, 46, 16 ], [ 1, 135, 107, 5, 136, 108 ], [ 10, 74, 46, 1, 75, 47 ], [ 1, 50, 22, 15, 51, 23 ], [ 2, 42, 14, 17, 43, 15 ], [ 5, 150, 120, 1, 151, 121 ], [ 9, 69, 43, 4, 70, 44 ], [ 17, 50, 22, 1, 51, 23 ], [ 2, 42, 14, 19, 43, 15 ], [ 3, 141, 113, 4, 142, 114 ], [ 3, 70, 44, 11, 71, 45 ], [ 17, 47, 21, 4, 48, 22 ], [ 9, 39, 13, 16, 40, 14 ], [ 3, 135, 107, 5, 136, 108 ], [ 3, 67, 41, 13, 68, 42 ], [ 15, 54, 24, 5, 55, 25 ], [ 15, 43, 15, 10, 44, 16 ], [ 4, 144, 116, 4, 145, 117 ], [ 17, 68, 42 ], [ 17, 50, 22, 6, 51, 23 ], [ 19, 46, 16, 6, 47, 17 ], [ 2, 139, 111, 7, 140, 112 ], [ 17, 74, 46 ], [ 7, 54, 24, 16, 55, 25 ], [ 34, 37, 13 ], [ 4, 151, 121, 5, 152, 122 ], [ 4, 75, 47, 14, 76, 48 ], [ 11, 54, 24, 14, 55, 25 ], [ 16, 45, 15, 14, 46, 16 ], [ 6, 147, 117, 4, 148, 118 ], [ 6, 73, 45, 14, 74, 46 ], [ 11, 54, 24, 16, 55, 25 ], [ 30, 46, 16, 2, 47, 17 ], [ 8, 132, 106, 4, 133, 107 ], [ 8, 75, 47, 13, 76, 48 ], [ 7, 54, 24, 22, 55, 25 ], [ 22, 45, 15, 13, 46, 16 ], [ 10, 142, 114, 2, 143, 115 ], [ 19, 74, 46, 4, 75, 47 ], [ 28, 50, 22, 6, 51, 23 ], [ 33, 46, 16, 4, 47, 17 ], [ 8, 152, 122, 4, 153, 123 ], [ 22, 73, 45, 3, 74, 46 ], [ 8, 53, 23, 26, 54, 24 ], [ 12, 45, 15, 28, 46, 16 ], [ 3, 147, 117, 10, 148, 118 ], [ 3, 73, 45, 23, 74, 46 ], [ 4, 54, 24, 31, 55, 25 ], [ 11, 45, 15, 31, 46, 16 ], [ 7, 146, 116, 7, 147, 117 ], [ 21, 73, 45, 7, 74, 46 ], [ 1, 53, 23, 37, 54, 24 ], [ 19, 45, 15, 26, 46, 16 ], [ 5, 145, 115, 10, 146, 116 ], [ 19, 75, 47, 10, 76, 48 ], [ 15, 54, 24, 25, 55, 25 ], [ 23, 45, 15, 25, 46, 16 ], [ 13, 145, 115, 3, 146, 116 ], [ 2, 74, 46, 29, 75, 47 ], [ 42, 54, 24, 1, 55, 25 ], [ 23, 45, 15, 28, 46, 16 ], [ 17, 145, 115 ], [ 10, 74, 46, 23, 75, 47 ], [ 10, 54, 24, 35, 55, 25 ], [ 19, 45, 15, 35, 46, 16 ], [ 17, 145, 115, 1, 146, 116 ], [ 14, 74, 46, 21, 75, 47 ], [ 29, 54, 24, 19, 55, 25 ], [ 11, 45, 15, 46, 46, 16 ], [ 13, 145, 115, 6, 146, 116 ], [ 14, 74, 46, 23, 75, 47 ], [ 44, 54, 24, 7, 55, 25 ], [ 59, 46, 16, 1, 47, 17 ], [ 12, 151, 121, 7, 152, 122 ], [ 12, 75, 47, 26, 76, 48 ], [ 39, 54, 24, 14, 55, 25 ], [ 22, 45, 15, 41, 46, 16 ], [ 6, 151, 121, 14, 152, 122 ], [ 6, 75, 47, 34, 76, 48 ], [ 46, 54, 24, 10, 55, 25 ], [ 2, 45, 15, 64, 46, 16 ], [ 17, 152, 122, 4, 153, 123 ], [ 29, 74, 46, 14, 75, 47 ], [ 49, 54, 24, 10, 55, 25 ], [ 24, 45, 15, 46, 46, 16 ], [ 4, 152, 122, 18, 153, 123 ], [ 13, 74, 46, 32, 75, 47 ], [ 48, 54, 24, 14, 55, 25 ], [ 42, 45, 15, 32, 46, 16 ], [ 20, 147, 117, 4, 148, 118 ], [ 40, 75, 47, 7, 76, 48 ], [ 43, 54, 24, 22, 55, 25 ], [ 10, 45, 15, 67, 46, 16 ], [ 19, 148, 118, 6, 149, 119 ], [ 18, 75, 47, 31, 76, 48 ], [ 34, 54, 24, 34, 55, 25 ], [ 20, 45, 15, 61, 46, 16 ] ], QRRSBlock.getRSBlocks = function(typeNumber, errorCorrectLevel) {
        var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel);
        if (rsBlock == undefined) throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + errorCorrectLevel);
        var length = rsBlock.length / 3, list = [];
        for (var i = 0; i < length; i++) {
            var count = rsBlock[i * 3 + 0], totalCount = rsBlock[i * 3 + 1], dataCount = rsBlock[i * 3 + 2];
            for (var j = 0; j < count; j++) list.push(new QRRSBlock(totalCount, dataCount));
        }
        return list;
    }, QRRSBlock.getRsBlockTable = function(typeNumber, errorCorrectLevel) {
        switch (errorCorrectLevel) {
          case QRErrorCorrectLevel.L:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
          case QRErrorCorrectLevel.M:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
          case QRErrorCorrectLevel.Q:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
          case QRErrorCorrectLevel.H:
            return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
          default:
            return undefined;
        }
    }, QRBitBuffer.prototype = {
        "get": function(index) {
            var bufIndex = Math.floor(index / 8);
            return (this.buffer[bufIndex] >>> 7 - index % 8 & 1) == 1;
        },
        "put": function(num, length) {
            for (var i = 0; i < length; i++) this.putBit((num >>> length - i - 1 & 1) == 1);
        },
        "getLengthInBits": function() {
            return this.length;
        },
        "putBit": function(bit) {
            var bufIndex = Math.floor(this.length / 8);
            this.buffer.length <= bufIndex && this.buffer.push(0), bit && (this.buffer[bufIndex] |= 128 >>> this.length % 8), this.length++;
        }
    };
    var QRCodeLimitLength=[[17,14,11,7],[32,26,20,14],[53,42,32,24],[78,62,46,34],[106,84,60,44],[134,106,74,58],[154,122,86,64],[192,152,108,84],[230,180,130,98],[271,213,151,119],[321,251,177,137],[367,287,203,155],[425,331,241,177],[458,362,258,194],[520,412,292,220],[586,450,322,250],[644,504,364,280],[718,560,394,310],[792,624,442,338],[858,666,482,382],[929,711,509,403],[1003,779,565,439],[1091,857,611,461],[1171,911,661,511],[1273,997,715,535],[1367,1059,751,593],[1465,1125,805,625],[1528,1190,868,658],[1628,1264,908,698],[1732,1370,982,742],[1840,1452,1030,790],[1952,1538,1112,842],[2068,1628,1168,898],[2188,1722,1228,958],[2303,1809,1283,983],[2431,1911,1351,1051],[2563,1989,1423,1093],[2699,2099,1499,1139],[2809,2213,1579,1219],[2953,2331,1663,1273]];

    function _isSupportCanvas() {
        return typeof CanvasRenderingContext2D != "undefined";
    }

    // android 2.x doesn't support Data-URI spec
    function _getAndroid() {
        var android = false;
        var sAgent = navigator.userAgent;

        if (/android/i.test(sAgent)) { // android
            android = true;
            aMat = sAgent.toString().match(/android ([0-9]\.[0-9])/i);

            if (aMat && aMat[1]) {
                android = parseFloat(aMat[1]);
            }
        }

        return android;
    }

    var svgDrawer = (function() {

        var Drawing = function (el, htOption) {
            this._el = el;
            this._htOption = htOption;
        };

        Drawing.prototype.draw = function (oQRCode) {
            var _htOption = this._htOption;
            var _el = this._el;
            var nCount = oQRCode.getModuleCount();
            var nWidth = Math.floor(_htOption.width / nCount);
            var nHeight = Math.floor(_htOption.height / nCount);

            this.clear();

            function makeSVG(tag, attrs) {
                var el = document.createElementNS('http://www.w3.org/2000/svg', tag);
                for (var k in attrs)
                    if (attrs.hasOwnProperty(k)) el.setAttribute(k, attrs[k]);
                return el;
            }

            var svg = makeSVG("svg" , {'viewBox': '0 0 ' + String(nCount) + " " + String(nCount), 'width': '100%', 'height': '100%', 'fill': _htOption.colorLight});
            svg.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink");
            _el.appendChild(svg);

            svg.appendChild(makeSVG("rect", {"fill": _htOption.colorDark, "width": "1", "height": "1", "id": "template"}));

            for (var row = 0; row < nCount; row++) {
                for (var col = 0; col < nCount; col++) {
                    if (oQRCode.isDark(row, col)) {
                        var child = makeSVG("use", {"x": String(row), "y": String(col)});
                        child.setAttributeNS("http://www.w3.org/1999/xlink", "href", "#template")
                        svg.appendChild(child);
                    }
                }
            }
        };
        Drawing.prototype.clear = function () {
            while (this._el.hasChildNodes())
                this._el.removeChild(this._el.lastChild);
        };
        return Drawing;
    })();

    var useSVG = document.documentElement.tagName.toLowerCase() === "svg";

    // Drawing in DOM by using Table tag
    var Drawing = useSVG ? svgDrawer : !_isSupportCanvas() ? (function () {
        var Drawing = function (el, htOption) {
            this._el = el;
            this._htOption = htOption;
        };

        /**
         * Draw the QRCode
         * 
         * @param {QRCode} oQRCode
         */
        Drawing.prototype.draw = function (oQRCode) {
            var _htOption = this._htOption;
            var _el = this._el;
            var nCount = oQRCode.getModuleCount();
            var nWidth = Math.floor(_htOption.width / nCount);
            var nHeight = Math.floor(_htOption.height / nCount);
            var aHTML = [''];

            for (var row = 0; row < nCount; row++) {
                aHTML.push('');

                for (var col = 0; col < nCount; col++) {
                    aHTML.push('');
                }

                aHTML.push('');
            }

            aHTML.push('
'px;height:' + nHeight + 'px;background-color:' + (oQRCode.isDark(row, col) ? _htOption.colorDark : _htOption.colorLight) + ';">
');
            _el.innerHTML = aHTML.join('');

            // Fix the margin values as real size.
            var elTable = _el.childNodes[0];
            var nLeftMarginTable = (_htOption.width - elTable.offsetWidth) / 2;
            var nTopMarginTable = (_htOption.height - elTable.offsetHeight) / 2;
            if (nLeftMarginTable > 0 && nTopMarginTable > 0) {
                elTable.style.margin = nTopMarginTable + "px " + nLeftMarginTable + "px";    
            }
        };

        /**
         * Clear the QRCode
         */
        Drawing.prototype.clear = function () {
            this._el.innerHTML = '';
        };

        return Drawing;
    })() : (function () { // Drawing in Canvas
        function _onMakeImage() {
            this._elImage.src = this._elCanvas.toDataURL("image/png");
            this._elImage.style.display = "block";
            this._elCanvas.style.display = "none";            
        }

        // Android 2.1 bug workaround
        // http://code.google.com/p/android/issues/detail?id=5141
        if (this._android && this._android <= 2.1) {
            var factor = 1 / window.devicePixelRatio;
            var drawImage = CanvasRenderingContext2D.prototype.drawImage; 
            CanvasRenderingContext2D.prototype.drawImage = function (image, sx, sy, sw, sh, dx, dy, dw, dh) {
                if (("nodeName" in image) && /img/i.test(image.nodeName)) {
                    for (var i = arguments.length - 1; i >= 1; i--) {
                        arguments[i] = arguments[i] * factor;
                    }
                } else if (typeof dw == "undefined") {
                    arguments[1] *= factor;
                    arguments[2] *= factor;
                    arguments[3] *= factor;
                    arguments[4] *= factor;
                }

                drawImage.apply(this, arguments); 
            };
        }

        /**
         * Check whether the user's browser supports Data URI or not
         * 
         * @private
         * @param {Function} fSuccess Occurs if it supports Data URI
         * @param {Function} fFail Occurs if it doesn't support Data URI
         */
        function _safeSetDataURI(fSuccess, fFail) {
            var self = this;
            self._fFail = fFail;
            self._fSuccess = fSuccess;

            // Check it just once
            if (self._bSupportDataURI === null) {
                var el = document.createElement("img");
                var fOnError = function() {
                    self._bSupportDataURI = false;

                    if (self._fFail) {
                        _fFail.call(self);
                    }
                };
                var fOnSuccess = function() {
                    self._bSupportDataURI = true;

                    if (self._fSuccess) {
                        self._fSuccess.call(self);
                    }
                };

                el.onabort = fOnError;
                el.onerror = fOnError;
                el.onload = fOnSuccess;
                el.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // the Image contains 1px data.
                return;
            } else if (self._bSupportDataURI === true && self._fSuccess) {
                self._fSuccess.call(self);
            } else if (self._bSupportDataURI === false && self._fFail) {
                self._fFail.call(self);
            }
        };

        /**
         * Drawing QRCode by using canvas
         * 
         * @constructor
         * @param {HTMLElement} el
         * @param {Object} htOption QRCode Options 
         */
        var Drawing = function (el, htOption) {
            this._bIsPainted = false;
            this._android = _getAndroid();

            this._htOption = htOption;
            this._elCanvas = document.createElement("canvas");
            this._elCanvas.width = htOption.width;
            this._elCanvas.height = htOption.height;
            el.appendChild(this._elCanvas);
            this._el = el;
            this._oContext = this._elCanvas.getContext("2d");
            this._bIsPainted = false;
            this._elImage = document.createElement("img");
            this._elImage.alt = "Scan me!";
            this._elImage.style.display = "none";
            this._el.appendChild(this._elImage);
            this._bSupportDataURI = null;
        };

        /**
         * Draw the QRCode
         * 
         * @param {QRCode} oQRCode 
         */
        Drawing.prototype.draw = function (oQRCode) {
            var _elImage = this._elImage;
            var _oContext = this._oContext;
            var _htOption = this._htOption;

            var nCount = oQRCode.getModuleCount();
            var nWidth = _htOption.width / nCount;
            var nHeight = _htOption.height / nCount;
            var nRoundedWidth = Math.round(nWidth);
            var nRoundedHeight = Math.round(nHeight);

            _elImage.style.display = "none";
            this.clear();

            for (var row = 0; row < nCount; row++) {
                for (var col = 0; col < nCount; col++) {
                    var bIsDark = oQRCode.isDark(row, col);
                    var nLeft = col * nWidth;
                    var nTop = row * nHeight;
                    _oContext.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
                    _oContext.lineWidth = 1;
                    _oContext.fillStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;                    
                    _oContext.fillRect(nLeft, nTop, nWidth, nHeight);

                    // 안티 앨리어싱 방지 처리
                    _oContext.strokeRect(
                        Math.floor(nLeft) + 0.5,
                        Math.floor(nTop) + 0.5,
                        nRoundedWidth,
                        nRoundedHeight
                    );

                    _oContext.strokeRect(
                        Math.ceil(nLeft) - 0.5,
                        Math.ceil(nTop) - 0.5,
                        nRoundedWidth,
                        nRoundedHeight
                    );
                }
            }

            this._bIsPainted = true;
        };

        /**
         * Make the image from Canvas if the browser supports Data URI.
         */
        Drawing.prototype.makeImage = function () {
            if (this._bIsPainted) {
                _safeSetDataURI.call(this, _onMakeImage);
            }
        };

        /**
         * Return whether the QRCode is painted or not
         * 
         * @return {Boolean}
         */
        Drawing.prototype.isPainted = function () {
            return this._bIsPainted;
        };

        /**
         * Clear the QRCode
         */
        Drawing.prototype.clear = function () {
            this._oContext.clearRect(0, 0, this._elCanvas.width, this._elCanvas.height);
            this._bIsPainted = false;
        };

        /**
         * @private
         * @param {Number} nNumber
         */
        Drawing.prototype.round = function (nNumber) {
            if (!nNumber) {
                return nNumber;
            }

            return Math.floor(nNumber * 1000) / 1000;
        };

        return Drawing;
    })();

    /**
     * Get the type by string length
     * 
     * @private
     * @param {String} sText
     * @param {Number} nCorrectLevel
     * @return {Number} type
     */
    function _getTypeNumber(sText, nCorrectLevel) {            
        var nType = 1;
        var length = _getUTF8Length(sText);

        for (var i = 0, len = QRCodeLimitLength.length; i <= len; i++) {
            var nLimit = 0;

            switch (nCorrectLevel) {
                case QRErrorCorrectLevel.L :
                    nLimit = QRCodeLimitLength[i][0];
                    break;
                case QRErrorCorrectLevel.M :
                    nLimit = QRCodeLimitLength[i][1];
                    break;
                case QRErrorCorrectLevel.Q :
                    nLimit = QRCodeLimitLength[i][2];
                    break;
                case QRErrorCorrectLevel.H :
                    nLimit = QRCodeLimitLength[i][3];
                    break;
            }

            if (length <= nLimit) {
                break;
            } else {
                nType++;
            }
        }

        if (nType > QRCodeLimitLength.length) {
            throw new Error("Too long data");
        }

        return nType;
    }

    function _getUTF8Length(sText) {
        var replacedText = encodeURI(sText).toString().replace(/\%[0-9a-fA-F]{2}/g, 'a');
        return replacedText.length + (replacedText.length != sText ? 3 : 0);
    }

    /**
     * @class QRCode
     * @constructor
     * @example 
     * new QRCode(document.getElementById("test"), "http://jindo.dev.naver.com/collie");
     *
     * @example
     * var oQRCode = new QRCode("test", {
     *    text : "http://naver.com",
     *    width : 128,
     *    height : 128
     * });
     * 
     * oQRCode.clear(); // Clear the QRCode.
     * oQRCode.makeCode("http://map.naver.com"); // Re-create the QRCode.
     *
     * @param {HTMLElement|String} el target element or 'id' attribute of element.
     * @param {Object|String} vOption
     * @param {String} vOption.text QRCode link data
     * @param {Number} [vOption.width=256]
     * @param {Number} [vOption.height=256]
     * @param {String} [vOption.colorDark="#000000"]
     * @param {String} [vOption.colorLight="#ffffff"]
     * @param {QRCode.CorrectLevel} [vOption.correctLevel=QRCode.CorrectLevel.H] [L|M|Q|H] 
     */
    QRCode = function (el, vOption) {
        this._htOption = {
            width : 256, 
            height : 256,
            typeNumber : 4,
            colorDark : "#000000",
            colorLight : "#ffffff",
            correctLevel : QRErrorCorrectLevel.H
        };

        if (typeof vOption === 'string') {
            vOption    = {
                text : vOption
            };
        }

        // Overwrites options
        if (vOption) {
            for (var i in vOption) {
                this._htOption[i] = vOption[i];
            }
        }

        if (typeof el == "string") {
            el = document.getElementById(el);
        }

        this._android = _getAndroid();
        this._el = el;
        this._oQRCode = null;
        this._oDrawing = new Drawing(this._el, this._htOption);

        if (this._htOption.text) {
            this.makeCode(this._htOption.text);    
        }
    };

    /**
     * Make the QRCode
     * 
     * @param {String} sText link data
     */
    QRCode.prototype.makeCode = function (sText) {
        this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel);
        this._oQRCode.addData(sText);
        this._oQRCode.make();
        this._el.title = sText;
        this._oDrawing.draw(this._oQRCode);            
        this.makeImage();
    };

    /**
     * Make the Image from Canvas element
     * - It occurs automatically
     * - Android below 3 doesn't support Data-URI spec.
     * 
     * @private
     */
    QRCode.prototype.makeImage = function () {
        if (typeof this._oDrawing.makeImage == "function" && (!this._android || this._android >= 3)) {
            this._oDrawing.makeImage();
        }
    };

    /**
     * Clear the QRCode
     */
    QRCode.prototype.clear = function () {
        this._oDrawing.clear();
    };

    /**
     * @name QRCode.CorrectLevel
     */
    QRCode.CorrectLevel = QRErrorCorrectLevel;
})();

index.html代码片段：

<html>

    <head>
        <title>title>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <style>
            #qrcode {
                text-align: center;
                display: table-cell;
                margin: 0 auto;
                text-align: center;
                vertical-align:middle;
                position: relative;
            }
        style>
        <script src="qrcode-main.js">script>
    head>

    <body>
        <div id="qrcode">div>

        <input type="text" id="getval" />
        <button id="send">点击更换验证码button>
        <script>
            window.onload = function() {
                var qrcode = new QRCode(document.getElementById("qrcode"), {
                    width: 100, //设置宽高
                    height: 100
                });
                qrcode.makeCode("http://www.baidu.com");//默认为百度的二维码

                document.getElementById("send").onclick = function() {
                    qrcode.makeCode(document.getElementById("getval").value);
                }
            }
        script>
    body>

html>

---

详细地址：点这里