微信小程序中要将一个字符串展示为二维码的形式，需要引入该js文件
1// Core code comes from https://github.com/davidshimjs/qrcodejs 2var QRCode; 3 4(function () { 5 /** 6 * Get the type by string length 7 * 8 * @private 9 * @param {String} sText 10 * @param {Number} nCorrectLevel 11 * @return {Number} type 12 */ 13 function _getTypeNumber(sText, nCorrectLevel) { 14 var nType = 1; 15 var length = _getUTF8Length(sText); 16 17 for (var i = 0, len = QRCodeLimitLength.length; i <= len; i++) { 18 var nLimit = 0; 19 20 switch (nCorrectLevel) { 21 case QRErrorCorrectLevel.L: 22 nLimit = QRCodeLimitLength[i][0]; 23 break; 24 case QRErrorCorrectLevel.M: 25 nLimit = QRCodeLimitLength[i][1]; 26 break; 27 case QRErrorCorrectLevel.Q: 28 nLimit = QRCodeLimitLength[i][2]; 29 break; 30 case QRErrorCorrectLevel.H: 31 nLimit = QRCodeLimitLength[i][3]; 32 break; 33 } 34 35 if (length <= nLimit) { 36 break; 37 } else { 38 nType++; 39 } 40 } 41 42 if (nType > QRCodeLimitLength.length) { 43 throw new Error("Too long data"); 44 } 45 46 return nType; 47 } 48 49 function _getUTF8Length(sText) { 50 var replacedText = encodeURI(sText).toString().replace(/\%[0-9a-fA-F]{2}/g, 'a'); 51 return replacedText.length + (replacedText.length != sText ? 3 : 0); 52 } 53 54 function QR8bitByte(data) { 55 this.mode = QRMode.MODE_8BIT_BYTE; 56 this.data = data; 57 this.parsedData = []; 58 59 // Added to support UTF-8 Characters 60 for (var i = 0, l = this.data.length; i < l; i++) { 61 var byteArray = []; 62 var code = this.data.charCodeAt(i); 63 64 if (code > 0x10000) { 65 byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18); 66 byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12); 67 byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6); 68 byteArray[3] = 0x80 | (code & 0x3F); 69 } else if (code > 0x800) { 70 byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12); 71 byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6); 72 byteArray[2] = 0x80 | (code & 0x3F); 73 } else if (code > 0x80) { 74 byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6); 75 byteArray[1] = 0x80 | (code & 0x3F); 76 } else { 77 byteArray[0] = code; 78 } 79 80 this.parsedData.push(byteArray); 81 } 82 83 this.parsedData = Array.prototype.concat.apply([], this.parsedData); 84 85 if (this.parsedData.length != this.data.length) { 86 this.parsedData.unshift(191); 87 this.parsedData.unshift(187); 88 this.parsedData.unshift(239); 89 } 90 } 91 92 QR8bitByte.prototype = { 93 getLength: function (buffer) { 94 return this.parsedData.length; 95 }, 96 write: function (buffer) { 97 for (var i = 0, l = this.parsedData.length; i < l; i++) { 98 buffer.put(this.parsedData[i], 8); 99 } 100 } 101 }; 102 103 104 // QRCodeModel 105 function QRCodeModel(typeNumber, errorCorrectLevel) { 106 this.typeNumber = typeNumber; 107 this.errorCorrectLevel = errorCorrectLevel; 108 this.modules = null; 109 this.moduleCount = 0; 110 this.dataCache = null; 111 this.dataList = []; 112 } 113 QRCodeModel.prototype = { 114 addData: function (data) { var newData = new QR8bitByte(data); this.dataList.push(newData); this.dataCache = null; }, isDark: function (row, col) { 115 if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) { throw new Error(row + "," + col); } 116 return this.modules[row][col]; 117 }, getModuleCount: function () { return this.moduleCount; }, make: function () { this.makeImpl(false, this.getBestMaskPattern()); }, makeImpl: function (test, maskPattern) { 118 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; } } 119 this.setupPositionProbePattern(0, 0); this.setupPositionProbePattern(this.moduleCount - 7, 0); this.setupPositionProbePattern(0, this.moduleCount - 7); this.setupPositionAdjustPattern(); this.setupTimingPattern(); this.setupTypeInfo(test, maskPattern); if (this.typeNumber >= 7) { this.setupTypeNumber(test); } 120 if (this.dataCache == null) { this.dataCache = QRCodeModel.createData(this.typeNumber, this.errorCorrectLevel, this.dataList); } 121 this.mapData(this.dataCache, maskPattern); 122 }, 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; } } } }, getBestMaskPattern: function () { 123 var minLostPoint = 0; var pattern = 0; for (var i = 0; i < 8; i++) { this.makeImpl(true, i); var lostPoint = QRUtil.getLostPoint(this); if (i == 0 || minLostPoint > lostPoint) { minLostPoint = lostPoint; pattern = i; } } 124 return pattern; 125 }, createMovieClip: function (target_mc, instance_name, depth) { 126 var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth); var 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; var dark = this.modules[row][col]; if (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(); } } } 127 return qr_mc; 128 }, setupTimingPattern: function () { 129 for (var r = 8; r < this.moduleCount - 8; r++) { 130 if (this.modules[r][6] != null) { continue; } 131 this.modules[r][6] = (r % 2 == 0); 132 } 133 for (var c = 8; c < this.moduleCount - 8; c++) { 134 if (this.modules[6][c] != null) { continue; } 135 this.modules[6][c] = (c % 2 == 0); 136 } 137 }, setupPositionAdjustPattern: function () { 138 var pos = QRUtil.getPatternPosition(this.typeNumber); for (var i = 0; i < pos.length; i++) { 139 for (var j = 0; j < pos.length; j++) { 140 var row = pos[i]; var col = pos[j]; if (this.modules[row][col] != null) { continue; } 141 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; } } } 142 } 143 } 144 }, setupTypeNumber: function (test) { 145 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; } 146 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; } 147 }, setupTypeInfo: function (test, maskPattern) { 148 var data = (this.errorCorrectLevel << 3) | maskPattern; var bits = QRUtil.getBCHTypeInfo(data); 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; } } 149 for (var i = 0; i < 15; i++) { 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; } } 150 this.modules[this.moduleCount - 8][8] = (!test); 151 }, mapData: function (data, maskPattern) { 152 var inc = -1; var row = this.moduleCount - 1; var bitIndex = 7; var byteIndex = 0; for (var col = this.moduleCount - 1; col > 0; col -= 2) { 153 if (col == 6) col--; while (true) { 154 for (var c = 0; c < 2; c++) { 155 if (this.modules[row][col - c] == null) { 156 var dark = false; if (byteIndex < data.length) { dark = (((data[byteIndex] >>> bitIndex) & 1) == 1); } 157 var mask = QRUtil.getMask(maskPattern, row, col - c); if (mask) { dark = !dark; } 158 this.modules[row][col - c] = dark; bitIndex--; if (bitIndex == -1) { byteIndex++; bitIndex = 7; } 159 } 160 } 161 row += inc; if (row < 0 || this.moduleCount <= row) { row -= inc; inc = -inc; break; } 162 } 163 } 164 } 165 }; 166 QRCodeModel.PAD0 = 0xEC; 167 QRCodeModel.PAD1 = 0x11; 168 QRCodeModel.createData = function (typeNumber, errorCorrectLevel, dataList) { 169 var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel); var 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); } 170 var totalDataCount = 0; for (var i = 0; i < rsBlocks.length; i++) { totalDataCount += rsBlocks[i].dataCount; } 171 if (buffer.getLengthInBits() > totalDataCount * 8) { 172 throw new Error("code length overflow. (" 173 + buffer.getLengthInBits() 174 + ">" 175 + totalDataCount * 8 176 + ")"); 177 } 178 if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) { buffer.put(0, 4); } 179 while (buffer.getLengthInBits() % 8 != 0) { buffer.putBit(false); } 180 while (true) { 181 if (buffer.getLengthInBits() >= totalDataCount * 8) { break; } 182 buffer.put(QRCodeModel.PAD0, 8); if (buffer.getLengthInBits() >= totalDataCount * 8) { break; } 183 buffer.put(QRCodeModel.PAD1, 8); 184 } 185 return QRCodeModel.createBytes(buffer, rsBlocks); 186 }; 187 QRCodeModel.createBytes = function (buffer, rsBlocks) { 188 var offset = 0; var maxDcCount = 0; var maxEcCount = 0; var dcdata = new Array(rsBlocks.length); var ecdata = new Array(rsBlocks.length); for (var r = 0; r < rsBlocks.length; r++) { 189 var dcCount = rsBlocks[r].dataCount; var 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] = 0xff & buffer.buffer[i + offset]; } 190 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; } 191 } 192 var totalCodeCount = 0; for (var i = 0; i < rsBlocks.length; i++) { totalCodeCount += rsBlocks[i].totalCount; } 193 var data = new Array(totalCodeCount); 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]; } } } 194 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]; } } } 195 return data; 196 }; 197 var QRMode = { MODE_NUMBER: 1 << 0, MODE_ALPHA_NUM: 1 << 1, MODE_8BIT_BYTE: 1 << 2, MODE_KANJI: 1 << 3 }; 198 var QRErrorCorrectLevel = { L: 1, M: 0, Q: 3, H: 2 }; 199 var QRMaskPattern = { PATTERN000: 0, PATTERN001: 1, PATTERN010: 2, PATTERN011: 3, PATTERN100: 4, PATTERN101: 5, PATTERN110: 6, PATTERN111: 7 }; 200 var QRUtil = { 201 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), getBCHTypeInfo: function (data) { 202 var d = data << 10; while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) { d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15))); } 203 return ((data << 10) | d) ^ QRUtil.G15_MASK; 204 }, getBCHTypeNumber: function (data) { 205 var d = data << 12; while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) { d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18))); } 206 return (data << 12) | d; 207 }, getBCHDigit: function (data) { 208 var digit = 0; while (data != 0) { digit++; data >>>= 1; } 209 return digit; 210 }, 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) { 211 var a = new QRPolynomial([1], 0); for (var i = 0; i < errorCorrectLength; i++) { a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0)); } 212 return a; 213 }, 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) { 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); } } else { throw new Error("type:" + type); } }, getLostPoint: function (qrCode) { 214 var moduleCount = qrCode.getModuleCount(); var lostPoint = 0; for (var row = 0; row < moduleCount; row++) { 215 for (var col = 0; col < moduleCount; col++) { 216 var sameCount = 0; var dark = qrCode.isDark(row, col); for (var r = -1; r <= 1; r++) { 217 if (row + r < 0 || moduleCount <= row + r) { continue; } 218 for (var c = -1; c <= 1; c++) { 219 if (col + c < 0 || moduleCount <= col + c) { continue; } 220 if (r == 0 && c == 0) { continue; } 221 if (dark == qrCode.isDark(row + r, col + c)) { sameCount++; } 222 } 223 } 224 if (sameCount > 5) { lostPoint += (3 + sameCount - 5); } 225 } 226 } 227 for (var row = 0; row < moduleCount - 1; row++) { for (var col = 0; col < moduleCount - 1; col++) { var count = 0; if (qrCode.isDark(row, col)) count++; if (qrCode.isDark(row + 1, col)) count++; if (qrCode.isDark(row, col + 1)) count++; if (qrCode.isDark(row + 1, col + 1)) count++; if (count == 0 || count == 4) { lostPoint += 3; } } } 228 for (var row = 0; row < moduleCount; row++) { for (var col = 0; col < moduleCount - 6; col++) { if (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; } } } 229 for (var col = 0; col < moduleCount; col++) { for (var row = 0; row < moduleCount - 6; row++) { if (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; } } } 230 var darkCount = 0; for (var col = 0; col < moduleCount; col++) { for (var row = 0; row < moduleCount; row++) { if (qrCode.isDark(row, col)) { darkCount++; } } } 231 var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5; lostPoint += ratio * 10; return lostPoint; 232 } 233 }; 234 var QRMath = { 235 glog: function (n) { 236 if (n < 1) { throw new Error("glog(" + n + ")"); } 237 return QRMath.LOG_TABLE[n]; 238 }, gexp: function (n) { 239 while (n < 0) { n += 255; } 240 while (n >= 256) { n -= 255; } 241 return QRMath.EXP_TABLE[n]; 242 }, EXP_TABLE: new Array(256), LOG_TABLE: new Array(256) 243 }; for (var i = 0; i < 8; i++) { QRMath.EXP_TABLE[i] = 1 << i; } 244 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]; } 245 for (var i = 0; i < 255; i++) { QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i; } 246 function QRPolynomial(num, shift) { 247 if (num.length == undefined) { throw new Error(num.length + "/" + shift); } 248 var offset = 0; while (offset < num.length && num[offset] == 0) { offset++; } 249 this.num = new Array(num.length - offset + shift); for (var i = 0; i < num.length - offset; i++) { this.num[i] = num[i + offset]; } 250 } 251 QRPolynomial.prototype = { 252 get: function (index) { return this.num[index]; }, getLength: function () { return this.num.length; }, multiply: function (e) { 253 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))); } } 254 return new QRPolynomial(num, 0); 255 }, mod: function (e) { 256 if (this.getLength() - e.getLength() < 0) { return this; } 257 var ratio = QRMath.glog(this.get(0)) - QRMath.glog(e.get(0)); var num = new Array(this.getLength()); for (var i = 0; i < this.getLength(); i++) { num[i] = this.get(i); } 258 for (var i = 0; i < e.getLength(); i++) { num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio); } 259 return new QRPolynomial(num, 0).mod(e); 260 } 261 }; 262 function QRRSBlock(totalCount, dataCount) { this.totalCount = totalCount; this.dataCount = dataCount; } 263 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]]; 264 QRRSBlock.getRSBlocks = function (typeNumber, errorCorrectLevel) { 265 var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel); if (rsBlock == undefined) { throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + errorCorrectLevel); } 266 var length = rsBlock.length / 3; var list = []; for (var i = 0; i < length; i++) { var count = rsBlock[i * 3 + 0]; var totalCount = rsBlock[i * 3 + 1]; var dataCount = rsBlock[i * 3 + 2]; for (var j = 0; j < count; j++) { list.push(new QRRSBlock(totalCount, dataCount)); } } 267 return list; 268 }; 269 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; } }; 270 function QRBitBuffer() { this.buffer = []; this.length = 0; } 271 QRBitBuffer.prototype = { 272 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) { 273 var bufIndex = Math.floor(this.length / 8); if (this.buffer.length <= bufIndex) { this.buffer.push(0); } 274 if (bit) { this.buffer[bufIndex] |= (0x80 >>> (this.length % 8)); } 275 this.length++; 276 } 277 }; 278 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]]; 279 280 // QRCode object 281 QRCode = function (canvasId, vOption) { 282 this._htOption = { 283 width: 256, 284 height: 256, 285 typeNumber: 4, 286 colorDark: "#000000", 287 colorLight: "#ffffff", 288 correctLevel: QRErrorCorrectLevel.H 289 }; 290 291 if (typeof vOption === 'string') { 292 vOption = { 293 text: vOption 294 }; 295 } 296 297 // Overwrites options 298 if (vOption) { 299 for (var i in vOption) { 300 this._htOption[i] = vOption[i]; 301 } 302 } 303 304 this._oQRCode = null; 305 this.canvasId = canvasId 306 307 if (this._htOption.text && this.canvasId) { 308 this.makeCode(this._htOption.text); 309 } 310 }; 311 312 QRCode.prototype.makeCode = function (sText) { 313 this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel); 314 this._oQRCode.addData(sText); 315 this._oQRCode.make(); 316 this.makeImage(); 317 }; 318 319 QRCode.prototype.makeImage = function () { 320 var _oContext 321 if (this._htOption.usingIn) { 322 _oContext = wx.createCanvasContext(this.canvasId, this._htOption.usingIn) 323 } 324 else { 325 _oContext = wx.createCanvasContext(this.canvasId) 326 } 327 var _htOption = this._htOption; 328 var oQRCode = this._oQRCode 329 330 var nCount = oQRCode.getModuleCount(); 331 var nWidth = _htOption.padding ? (_htOption.width - 2 * _htOption.padding) / nCount : _htOption.width / nCount; 332 var nHeight = _htOption.padding ? (_htOption.height - 2 * _htOption.padding) / nCount : _htOption.height / nCount; 333 var nRoundedHeight = Math.round(nHeight); 334 var nRoundedWidth = Math.round(nWidth); 335 336 if (_htOption.image && _htOption.image != '') { 337 _oContext.drawImage(_htOption.image, 0, 0, _htOption.width, _htOption.height) 338 } 339 _oContext.setFillStyle('#fff') 340 _oContext.fillRect(0, 0, _htOption.width, _htOption.height) 341 _oContext.save() 342 for (var row = 0; row < nCount; row++) { 343 for (var col = 0; col < nCount; col++) { 344 var bIsDark = oQRCode.isDark(row, col); 345 var nLeft = _htOption.padding ? col * nWidth + _htOption.padding : col * nWidth; 346 var nTop = _htOption.padding ? row * nHeight + _htOption.padding : row * nHeight; 347 _oContext.setStrokeStyle(bIsDark ? _htOption.colorDark : _htOption.colorLight) 348 // _oContext.setStrokeStyle('red') 349 _oContext.setLineWidth(1) 350 _oContext.setFillStyle(bIsDark ? _htOption.colorDark : _htOption.colorLight) 351 // _oContext.setFillStyle('red') 352 // if (bIsDark) { 353 _oContext.fillRect(nLeft, nTop, nWidth, nHeight); 354 // } 355 356 // 안티 앨리어싱 방지 처리 357 // if (bIsDark) { 358 _oContext.strokeRect( 359 Math.floor(nLeft) + 0.5, 360 Math.floor(nTop) + 0.5, 361 nRoundedHeight 362 ); 363 364 _oContext.strokeRect( 365 Math.ceil(nLeft) - 0.5, 366 Math.ceil(nTop) - 0.5, 367 nRoundedWidth, 368 nRoundedHeight 369 ); 370 // } 371 // _oContext.fillRect( 372 // Math.floor(nLeft) + 0.5, 373 // Math.floor(nTop) + 0.5, 374 // nRoundedWidth, 375 // nRoundedHeight 376 // ); 377 // _oContext.fillRect( 378 // Math.ceil(nLeft) - 0.5, 379 // Math.ceil(nTop) - 0.5, 380 // nRoundedWidth, 381 // nRoundedHeight 382 // ); 383 // _oContext.clearRect( 384 // Math.floor(nLeft) + 0.5, 385 // Math.floor(nTop) + 0.5, 386 // nRoundedWidth, 387 // nRoundedHeight 388 // ); 389 // _oContext.clearRect( 390 // Math.ceil(nLeft) - 0.5, 391 // Math.ceil(nTop) - 0.5, 392 // nRoundedWidth, 393 // nRoundedHeight 394 // ); 395 } 396 } 397 398 _oContext.draw(false, () => { 399 setTimeout(() => { 400 this.exportImage() 401 }, 800) 402 }) 403 }; 404 405 // 保存为图片，将临时路径传给回调 406 QRCode.prototype.exportImage = function (callback) { 407 if (this._htOption.callback && typeof this._htOption.callback === 'function') { 408 wx.canvasToTempFilePath({ 409 x: 0, 410 y: 0, 411 width: this._htOption.width, 412 height: this._htOption.height, 413 destWidth: this._htOption.width, 414 destHeight: this._htOption.height, 415 canvasId: this.canvasId, 416 success: (res) => { 417 this._htOption.callback({path: res.tempFilePath}) 418 } 419 }) 420 } 421 } 422 423 QRCode.CorrectLevel = QRErrorCorrectLevel; 424})(); 425 426module.exports = QRCode
在js文件中引入
1var QRCode = require('../../utils/weapp-qrcode.js') 2 3//生成二维码 4 generateCode(text){ 5 var code = new QRCode('myQrcode',{ 6 text: text, 7 width: 250, 8 height: 250, 9 padding: 12, // 生成二维码四周自动留边宽度，不传入默认为0 10 correctLevel: QRCode.CorrectLevel.H, // 二维码可辨识度 11 callback: (res) => { 12 console.log(res) 13 wx.hideLoading() 14 // 接下来就可以直接调用微信小程序的api保存到本地或者将这张二维码直接画在海报上面去，看各自需求 15 } 16 })
wxml页面上显示
<canvas class="canvas-code" canvas-id="myQrcode" class="img3"/>