vue2，vue3，uniapp，小程序实现前端url生成二维码

最近遇到一个项目，api返回url地址，前端通过地址生成二维码。

话不多说直接上代码，亲测有效，希望能帮助大家，同时如果有更好的方法希望大家能够分享

1、第一步，在项目的utils文件夹下面创建一个weapp-qrcode.js文件（文件名随便，只展示我自己的）

2、将一下代码复制粘体到js文件中


var QRCode;
(function() {/*** 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);}function QR8bitByte(data) {this.mode = QRMode.MODE_8BIT_BYTE;this.parsedData = [];// Added to support UTF-8 Charactersfor (var i = 0, l = this.length; i < l; i++) {var byteArray = [];var code = this.charCodeAt(i);if (code > 65536) {byteArray[0] = 240 | ((code & 1835008) >>> 18);byteArray[1] = 128 | ((code & 258048) >>> 12);byteArray[2] = 128 | ((code & 4032) >>> 6);byteArray[3] = 128 | (code & 63);} else if (code > 2048) {byteArray[0] = 224 | ((code & 61440) >>> 12);byteArray[1] = 128 | ((code & 4032) >>> 6);byteArray[2] = 128 | (code & 63);} else if (code > 128) {byteArray[0] = 192 | ((code & 1984) >>> 6);byteArray[1] = 128 | (code & 63);} else {byteArray[0] = code;}this.parsedData.push(byteArray);}this.parsedData = Array.prototype.concat.apply([], this.parsedData);if (this.parsedData.length != this.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);}}};// QRCodeModelfunction QRCodeModel(typeNumber, errorCorrectLevel) {this.typeNumber = typeNumber;this.errorCorrectLevel = errorCorrectLevel;this.modules = null;this.moduleCount = 0;this.dataCache = null;this.dataList = [];}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(false, 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);if (this.typeNumber >= 7) {this.setupTypeNumber(test);}if (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;}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() {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;}}return pattern;},createMovieClip: function(target_mc, instance_name, depth) {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();}}}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];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;}}}}}},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;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;}}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;}}this.modules[this.moduleCount - 8][8] = !test;},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;}}}}};QRCodeModel.PAD0 = 236;QRCodeModel.PAD1 = 17;QRCodeModel.createData = function(typeNumber, errorCorrectLevel, dataList) {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);}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 +')');}if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {buffer.put(0, 4);}while (buffer.getLengthInBits() % 8 != 0) {buffer.putBit(false);}while (true) {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;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++) {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] = 255 & 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 totalCodeCount = 0;for (var i = 0; i < rsBlocks.length; i++) {totalCodeCount += rsBlocks[i].totalCount;}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];}}}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;};var QRMode = {MODE_NUMBER: 1,MODE_ALPHA_NUM: 2,MODE_8BIT_BYTE: 4,MODE_KANJI: 8};var QRErrorCorrectLevel = {L: 1,M: 0,Q: 3,H: 2};var QRMaskPattern = {PATTERN000: 0,PATTERN001: 1,PATTERN010: 2,PATTERN011: 3,PATTERN100: 4,PATTERN101: 5,PATTERN110: 6,PATTERN111: 7};var 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: 1280 | 32 | 16 | 4 | 2 | 1,G18: 6144 | 1024 | 512 | 256 | 32 | 4 | 1,G15_MASK: 20480 | 1024 | 16 | 2,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) {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) {var moduleCount = qrCode.getModuleCount();var lostPoint = 0;for (var row = 0; row < moduleCount; row++) {for (var col = 0; col < moduleCount; col++) {var sameCount = 0;var 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;}if (dark == qrCode.isDark(row + r, col + c)) {sameCount++;}}}if (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;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;}}}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;}}}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;}}}var darkCount = 0;for (var col = 0; col < moduleCount; col++) {for (var row = 0; row < moduleCount; row++) {if (qrCode.isDark(row, col)) {darkCount++;}}}var ratio = Math.abs((100 * darkCount) / moduleCount / moduleCount - 50) / 5;lostPoint += ratio * 10;return lostPoint;}};var 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;}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;},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));var 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);}};function QRRSBlock(totalCount, dataCount) {this.totalCount = totalCount;this.dataCount = dataCount;}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;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));}}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;}};function QRBitBuffer() {this.buffer = [];this.length = 0;}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);if (this.buffer.length <= bufIndex) {this.buffer.push(0);}if (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]];// QRCode objectQRCode = function(canvasId, vOption) {this._htOption = {width: 256,height: 256,typeNumber: 4,colorDark: '#000000',colorLight: '#ffffff',correctLevel: QRErrorCorrectLevel.H};if (typeof vOption === 'string') {vOption = {text: vOption};}// Overwrites optionsif (vOption) {for (var i in vOption) {this._htOption[i] = vOption[i];}}this._oQRCode = null;this.canvasId = canvasId;if (this._htOption.text && this.canvasId) {this.makeCode(this._htOption.text);}};QRCode.prototype.makeCode = function(sText, callback) {this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel);this._oQRCode.addData(sText);this._oQRCode.make();this.makeImage(callback);};QRCode.prototype.makeImage = function(callback) {var _oContext;if (this._htOption.usingIn) {_oContext = uni.createCanvasContext(this.canvasId, this._htOption.usingIn);} else {_oContext = uni.createCanvasContext(this.canvasId);}var _htOption = this._htOption;var oQRCode = this._oQRCode;var nCount = oQRCode.getModuleCount();var nWidth = _htOption.width / nCount;var nHeight = _htOption.height / nCount;var nRoundedWidth = Math.round(nWidth);var nRoundedHeight = Math.round(nHeight);if (_htOption.image && _htOption.image != '') {_oContext.drawImage(_htOption.image, 0, 0, _htOption.width, _htOption.height);}for (var row = 0; row < nCount; row++) {for (var col = 0; col < nCount; col++) {var bIsDark = oQRCode.isDark(row, col);var nLeft = col * nWidth + 5;var nTop = row * nHeight + 5;_oContext.setStrokeStyle(bIsDark ? _htOption.colorDark : _htOption.colorLight);// _oContext.setStrokeStyle('yellow')_oContext.setLineWidth(1);_oContext.setFillStyle(bIsDark ? _htOption.colorDark : _htOption.colorLight);// _oContext.setFillStyle('red')// if (bIsDark) {_oContext.fillRect(nLeft, nTop, nWidth, nHeight);// }// 안티 앨리어싱 방지 처리// if (bIsDark) {_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);// }// _oContext.fillRect(//     Math.floor(nLeft) + 0.5,//     Math.floor(nTop) + 0.5,//     nRoundedWidth,//     nRoundedHeight// );// _oContext.fillRect(//     Math.ceil(nLeft) - 0.5,//     Math.ceil(nTop) - 0.5,//     nRoundedWidth,//     nRoundedHeight// );// _oContext.clearRect(//     Math.floor(nLeft) + 0.5,//     Math.floor(nTop) + 0.5,//     nRoundedWidth,//     nRoundedHeight// );// _oContext.clearRect(//     Math.ceil(nLeft) - 0.5,//     Math.ceil(nTop) - 0.5,//     nRoundedWidth,//     nRoundedHeight// );}}_oContext.draw(false, callback);};// 保存为图片，将临时路径传给回调QRCode.prototype.exportImage = function(callback) {if (!callback) {return;}uni.canvasToTempFilePath({x: 0,y: 0,width: this._htOption.width,height: this._htOption.height,destWidth: this._htOption.width,destHeight: this._htOption.height,canvasId: this.canvasId,success: function(res) {callback(res.tempFilePath);},fail: (res) => {console.log(res);}});};QRCode.CorrectLevel = QRErrorCorrectLevel;
})();
// module.exports = QRCode;
export {QRCode
}

3、在你需要使用的.vue中创建canvas，如下

<template><view><canvas canvas-id="canvas" style="width: 110px; height: 125px"></canvas><button @click="generateCode">生成二维码</button></view>
</template><script>import {QRCode} from '对应文件的路径'export default {methods: {generateCode() {new QRCode('canvas', {text: 'https://www.baidi.com',width: 100,height: 100,colorDark: '#000000',colorLight: '#ffffff',correctLevel: QRCode.CorrectLevel.H})}}}
</script>

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