小程序做二维码带logo绘制二维码

效果图：

wxml：

<view style="text-align: center;margin-top: 10px;" class="fontSize24">请扫描上方二维码</view>

</view>

wxss:

.logoQRCode {

position: fixed;

top: 50%;

left: 50%;

width: 180px;

height: 180px;

background: #fff;

z-index: 9999;

margin-left: -110px;

margin-top: -118px;

padding: 20px 20px 36px 20px;

border-radius: 12px;

}

js:

第一步先引入qrcode.js"

import QRCode from "../../utils/qrcode.js"

主要内容：

QRCode({

canvasId:"logoQRCode", // canvas-id

text: this.data.scanCodeVal, // 生成内容

size: 180, // 二维码大小

image: "../../static/logo.png", // 二维码图标必须是本地图片不能是网络路径

imageSize: 40,// 二维码图标大小

correctLevel: 1, // 容错级别

cbResult: function (res) { // 生成二维码的回调

})

上代码截图js：

qrcode.js文件：

//qrcode.js，复制下面代码粘贴即可
let QRCode = {};
(function () {/*** 获取单个字符的utf8编码* unicode BMP平面约65535个字符* @param {num} code* return {array}*/function unicodeFormat8(code) {// 1 bytevar c0, c1, c2;if (code < 128) {return [code];// 2 bytes} else if (code < 2048) {c0 = 192 + (code >> 6);c1 = 128 + (code & 63);return [c0, c1];// 3 bytes} else {c0 = 224 + (code >> 12);c1 = 128 + (code >> 6 & 63);c2 = 128 + (code & 63);return [c0, c1, c2];}}/*** 获取字符串的utf8编码字节串* @param {string} string* @return {array}*/function getUTF8Bytes(string) {var utf8codes = [];for (var i = 0; i < string.length; i++) {var code = string.charCodeAt(i);var utf8 = unicodeFormat8(code);for (var j = 0; j < utf8.length; j++) {utf8codes.push(utf8[j]);}}return utf8codes;}/*** 二维码算法实现* @param {string} data              要编码的信息字符串* @param {num} errorCorrectLevel 纠错等级*/function QRCodeAlg(data, errorCorrectLevel) {this.typeNumber = -1; //版本this.errorCorrectLevel = errorCorrectLevel;this.modules = null; //二维矩阵，存放最终结果this.moduleCount = 0; //矩阵大小this.dataCache = null; //数据缓存this.rsBlocks = null; //版本数据信息this.totalDataCount = -1; //可使用的数据量this.data = data;this.utf8bytes = getUTF8Bytes(data);this.make();}QRCodeAlg.prototype = {constructor: QRCodeAlg,/*** 获取二维码矩阵大小* @return {num} 矩阵大小*/getModuleCount: function () {return this.moduleCount;},/*** 编码*/make: function () {this.getRightType();this.dataCache = this.createData();this.createQrcode();},/*** 设置二位矩阵功能图形* @param  {bool} test 表示是否在寻找最好掩膜阶段* @param  {num} maskPattern 掩膜的版本*/makeImpl: function (maskPattern) {this.moduleCount = this.typeNumber * 4 + 17;this.modules = new Array(this.moduleCount);for (var row = 0; row < this.moduleCount; row++) {this.modules[row] = new Array(this.moduleCount);}this.setupPositionProbePattern(0, 0);this.setupPositionProbePattern(this.moduleCount - 7, 0);this.setupPositionProbePattern(0, this.moduleCount - 7);this.setupPositionAdjustPattern();this.setupTimingPattern();this.setupTypeInfo(true, maskPattern);if (this.typeNumber >= 7) {this.setupTypeNumber(true);}this.mapData(this.dataCache, maskPattern);},/*** 设置二维码的位置探测图形* @param  {num} row 探测图形的中心横坐标* @param  {num} col 探测图形的中心纵坐标*/setupPositionProbePattern: function (row, col) {for (var r = -1; r <= 7; r++) {if (row + r <= -1 || this.moduleCount <= row + r) continue;for (var c = -1; c <= 7; c++) {if (col + c <= -1 || this.moduleCount <= col + c) continue;if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {this.modules[row + r][col + c] = true;} else {this.modules[row + r][col + c] = false;}}}},/*** 创建二维码* @return {[type]} [description]*/createQrcode: function () {var minLostPoint = 0;var pattern = 0;var bestModules = null;for (var i = 0; i < 8; i++) {this.makeImpl(i);var lostPoint = QRUtil.getLostPoint(this);if (i == 0 || minLostPoint > lostPoint) {minLostPoint = lostPoint;pattern = i;bestModules = this.modules;}}this.modules = bestModules;this.setupTypeInfo(false, pattern);if (this.typeNumber >= 7) {this.setupTypeNumber(false);}},/*** 设置定位图形* @return {[type]} [description]*/setupTimingPattern: function () {for (var r = 8; r < this.moduleCount - 8; r++) {if (this.modules[r][6] != null) {continue;}this.modules[r][6] = (r % 2 == 0);if (this.modules[6][r] != null) {continue;}this.modules[6][r] = (r % 2 == 0);}},/*** 设置矫正图形* @return {[type]} [description]*/setupPositionAdjustPattern: function () {var pos = QRUtil.getPatternPosition(this.typeNumber);for (var i = 0; i < pos.length; i++) {for (var j = 0; j < pos.length; j++) {var row = pos[i];var col = pos[j];if (this.modules[row][col] != null) {continue;}for (var r = -2; r <= 2; r++) {for (var c = -2; c <= 2; c++) {if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {this.modules[row + r][col + c] = true;} else {this.modules[row + r][col + c] = false;}}}}}},/*** 设置版本信息（7以上版本才有）* @param  {bool} test 是否处于判断最佳掩膜阶段* @return {[type]}      [description]*/setupTypeNumber: function (test) {var bits = QRUtil.getBCHTypeNumber(this.typeNumber);for (var i = 0; i < 18; i++) {var mod = (!test && ((bits >> i) & 1) == 1);this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;}},/*** 设置格式信息（纠错等级和掩膜版本）* @param  {bool} test* @param  {num} maskPattern 掩膜版本* @return {}*/setupTypeInfo: function (test, maskPattern) {var data = (QRErrorCorrectLevel[this.errorCorrectLevel] << 3) | maskPattern;var bits = QRUtil.getBCHTypeInfo(data);// verticalfor (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;}// horizontalvar mod = (!test && ((bits >> i) & 1) == 1);if (i < 8) {this.modules[8][this.moduleCount - i - 1] = mod;} else if (i < 9) {this.modules[8][15 - i - 1 + 1] = mod;} else {this.modules[8][15 - i - 1] = mod;}}// fixed modulethis.modules[this.moduleCount - 8][8] = (!test);},/*** 数据编码* @return {[type]} [description]*/createData: function () {var buffer = new QRBitBuffer();var lengthBits = this.typeNumber > 9 ? 16 : 8;buffer.put(4, 4); //添加模式buffer.put(this.utf8bytes.length, lengthBits);for (var i = 0, l = this.utf8bytes.length; i < l; i++) {buffer.put(this.utf8bytes[i], 8);}if (buffer.length + 4 <= this.totalDataCount * 8) {buffer.put(0, 4);}// paddingwhile (buffer.length % 8 != 0) {buffer.putBit(false);}// paddingwhile (true) {if (buffer.length >= this.totalDataCount * 8) {break;}buffer.put(QRCodeAlg.PAD0, 8);if (buffer.length >= this.totalDataCount * 8) {break;}buffer.put(QRCodeAlg.PAD1, 8);}return this.createBytes(buffer);},/*** 纠错码编码* @param  {buffer} buffer 数据编码* @return {[type]}*/createBytes: function (buffer) {var offset = 0;var maxDcCount = 0;var maxEcCount = 0;var length = this.rsBlock.length / 3;var rsBlocks = new Array();for (var i = 0; i < length; i++) {var count = this.rsBlock[i * 3 + 0];var totalCount = this.rsBlock[i * 3 + 1];var dataCount = this.rsBlock[i * 3 + 2];for (var j = 0; j < count; j++) {rsBlocks.push([dataCount, totalCount]);}}var dcdata = new Array(rsBlocks.length);var ecdata = new Array(rsBlocks.length);for (var r = 0; r < rsBlocks.length; r++) {var dcCount = rsBlocks[r][0];var ecCount = rsBlocks[r][1] - dcCount;maxDcCount = Math.max(maxDcCount, dcCount);maxEcCount = Math.max(maxEcCount, ecCount);dcdata[r] = new Array(dcCount);for (var i = 0; i < dcdata[r].length; i++) {dcdata[r][i] = 0xff & buffer.buffer[i + offset];}offset += dcCount;var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);var modPoly = rawPoly.mod(rsPoly);ecdata[r] = new Array(rsPoly.getLength() - 1);for (var i = 0; i < ecdata[r].length; i++) {var modIndex = i + modPoly.getLength() - ecdata[r].length;ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0;}}var data = new Array(this.totalDataCount);var index = 0;for (var i = 0; i < maxDcCount; i++) {for (var r = 0; r < rsBlocks.length; r++) {if (i < dcdata[r].length) {data[index++] = dcdata[r][i];}}}for (var i = 0; i < maxEcCount; i++) {for (var r = 0; r < rsBlocks.length; r++) {if (i < ecdata[r].length) {data[index++] = ecdata[r][i];}}}return data;},/*** 布置模块，构建最终信息* @param  {} data* @param  {} maskPattern* @return {}*/mapData: function (data, maskPattern) {var inc = -1;var row = this.moduleCount - 1;var bitIndex = 7;var byteIndex = 0;for (var col = this.moduleCount - 1; col > 0; col -= 2) {if (col == 6) col--;while (true) {for (var c = 0; c < 2; c++) {if (this.modules[row][col - c] == null) {var dark = false;if (byteIndex < data.length) {dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);}var mask = QRUtil.getMask(maskPattern, row, col - c);if (mask) {dark = !dark;}this.modules[row][col - c] = dark;bitIndex--;if (bitIndex == -1) {byteIndex++;bitIndex = 7;}}}row += inc;if (row < 0 || this.moduleCount <= row) {row -= inc;inc = -inc;break;}}}}};/*** 填充字段*/QRCodeAlg.PAD0 = 0xEC;QRCodeAlg.PAD1 = 0x11;//---------------------------------------------------------------------// 纠错等级对应的编码//---------------------------------------------------------------------var QRErrorCorrectLevel = [1, 0, 3, 2];//---------------------------------------------------------------------// 掩膜版本//---------------------------------------------------------------------var QRMaskPattern = {PATTERN000: 0,PATTERN001: 1,PATTERN010: 2,PATTERN011: 3,PATTERN100: 4,PATTERN101: 5,PATTERN110: 6,PATTERN111: 7};//---------------------------------------------------------------------// 工具类//---------------------------------------------------------------------var QRUtil = {/*每个版本矫正图形的位置*/PATTERN_POSITION_TABLE: [[],[6, 18],[6, 22],[6, 26],[6, 30],[6, 34],[6, 22, 38],[6, 24, 42],[6, 26, 46],[6, 28, 50],[6, 30, 54],[6, 32, 58],[6, 34, 62],[6, 26, 46, 66],[6, 26, 48, 70],[6, 26, 50, 74],[6, 30, 54, 78],[6, 30, 56, 82],[6, 30, 58, 86],[6, 34, 62, 90],[6, 28, 50, 72, 94],[6, 26, 50, 74, 98],[6, 30, 54, 78, 102],[6, 28, 54, 80, 106],[6, 32, 58, 84, 110],[6, 30, 58, 86, 114],[6, 34, 62, 90, 118],[6, 26, 50, 74, 98, 122],[6, 30, 54, 78, 102, 126],[6, 26, 52, 78, 104, 130],[6, 30, 56, 82, 108, 134],[6, 34, 60, 86, 112, 138],[6, 30, 58, 86, 114, 142],[6, 34, 62, 90, 118, 146],[6, 30, 54, 78, 102, 126, 150],[6, 24, 50, 76, 102, 128, 154],[6, 28, 54, 80, 106, 132, 158],[6, 32, 58, 84, 110, 136, 162],[6, 26, 54, 82, 110, 138, 166],[6, 30, 58, 86, 114, 142, 170]],G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),/*BCH编码格式信息*/getBCHTypeInfo: function (data) {var d = data << 10;while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)));}return ((data << 10) | d) ^ QRUtil.G15_MASK;},/*BCH编码版本信息*/getBCHTypeNumber: function (data) {var d = data << 12;while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)));}return (data << 12) | d;},/*获取BCH位信息*/getBCHDigit: function (data) {var digit = 0;while (data != 0) {digit++;data >>>= 1;}return digit;},/*获取版本对应的矫正图形位置*/getPatternPosition: function (typeNumber) {return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];},/*掩膜算法*/getMask: function (maskPattern, i, j) {switch (maskPattern) {case QRMaskPattern.PATTERN000:return (i + j) % 2 == 0;case QRMaskPattern.PATTERN001:return i % 2 == 0;case QRMaskPattern.PATTERN010:return j % 3 == 0;case QRMaskPattern.PATTERN011:return (i + j) % 3 == 0;case QRMaskPattern.PATTERN100:return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;case QRMaskPattern.PATTERN101:return (i * j) % 2 + (i * j) % 3 == 0;case QRMaskPattern.PATTERN110:return ((i * j) % 2 + (i * j) % 3) % 2 == 0;case QRMaskPattern.PATTERN111:return ((i * j) % 3 + (i + j) % 2) % 2 == 0;default:throw new Error("bad maskPattern:" + maskPattern);}},/*获取RS的纠错多项式*/getErrorCorrectPolynomial: function (errorCorrectLength) {var a = new QRPolynomial([1], 0);for (var i = 0; i < errorCorrectLength; i++) {a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));}return a;},/*获取评价*/getLostPoint: function (qrCode) {var moduleCount = qrCode.getModuleCount(),lostPoint = 0,darkCount = 0;for (var row = 0; row < moduleCount; row++) {var sameCount = 0;var head = qrCode.modules[row][0];for (var col = 0; col < moduleCount; col++) {var current = qrCode.modules[row][col];//level 3 评价if (col < moduleCount - 6) {if (current && !qrCode.modules[row][col + 1] && qrCode.modules[row][col + 2] && qrCode.modules[row][col + 3] && qrCode.modules[row][col + 4] && !qrCode.modules[row][col + 5] && qrCode.modules[row][col + 6]) {if (col < moduleCount - 10) {if (qrCode.modules[row][col + 7] && qrCode.modules[row][col + 8] && qrCode.modules[row][col + 9] && qrCode.modules[row][col + 10]) {lostPoint += 40;}} else if (col > 3) {if (qrCode.modules[row][col - 1] && qrCode.modules[row][col - 2] && qrCode.modules[row][col - 3] && qrCode.modules[row][col - 4]) {lostPoint += 40;}}}}//level 2 评价if ((row < moduleCount - 1) && (col < moduleCount - 1)) {var count = 0;if (current) count++;if (qrCode.modules[row + 1][col]) count++;if (qrCode.modules[row][col + 1]) count++;if (qrCode.modules[row + 1][col + 1]) count++;if (count == 0 || count == 4) {lostPoint += 3;}}//level 1 评价if (head ^ current) {sameCount++;} else {head = current;if (sameCount >= 5) {lostPoint += (3 + sameCount - 5);}sameCount = 1;}//level 4 评价if (current) {darkCount++;}}}for (var col = 0; col < moduleCount; col++) {var sameCount = 0;var head = qrCode.modules[0][col];for (var row = 0; row < moduleCount; row++) {var current = qrCode.modules[row][col];//level 3 评价if (row < moduleCount - 6) {if (current && !qrCode.modules[row + 1][col] && qrCode.modules[row + 2][col] && qrCode.modules[row + 3][col] && qrCode.modules[row + 4][col] && !qrCode.modules[row + 5][col] && qrCode.modules[row + 6][col]) {if (row < moduleCount - 10) {if (qrCode.modules[row + 7][col] && qrCode.modules[row + 8][col] && qrCode.modules[row + 9][col] && qrCode.modules[row + 10][col]) {lostPoint += 40;}} else if (row > 3) {if (qrCode.modules[row - 1][col] && qrCode.modules[row - 2][col] && qrCode.modules[row - 3][col] && qrCode.modules[row - 4][col]) {lostPoint += 40;}}}}//level 1 评价if (head ^ current) {sameCount++;} else {head = current;if (sameCount >= 5) {lostPoint += (3 + sameCount - 5);}sameCount = 1;}}}// LEVEL4var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;lostPoint += ratio * 10;return lostPoint;}};//---------------------------------------------------------------------// QRMath使用的数学工具//---------------------------------------------------------------------var QRMath = {/*将n转化为a^m*/glog: function (n) {if (n < 1) {throw new Error("glog(" + n + ")");}return QRMath.LOG_TABLE[n];},/*将a^m转化为n*/gexp: function (n) {while (n < 0) {n += 255;}while (n >= 256) {n -= 255;}return QRMath.EXP_TABLE[n];},EXP_TABLE: new Array(256),LOG_TABLE: new Array(256)};for (var i = 0; i < 8; i++) {QRMath.EXP_TABLE[i] = 1 << i;}for (var i = 8; i < 256; i++) {QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];}for (var i = 0; i < 255; i++) {QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;}//---------------------------------------------------------------------// QRPolynomial 多项式//---------------------------------------------------------------------/*** 多项式类* @param {Array} num   系数* @param {num} shift a^shift*/function QRPolynomial(num, shift) {if (num.length == undefined) {throw new Error(num.length + "/" + shift);}var offset = 0;while (offset < num.length && num[offset] == 0) {offset++;}this.num = new Array(num.length - offset + shift);for (var i = 0; i < num.length - offset; i++) {this.num[i] = num[i + offset];}}QRPolynomial.prototype = {get: function (index) {return this.num[index];},getLength: function () {return this.num.length;},/*** 多项式乘法* @param  {QRPolynomial} e 被乘多项式* @return {[type]}   [description]*/multiply: function (e) {var num = new Array(this.getLength() + e.getLength() - 1);for (var i = 0; i < this.getLength(); i++) {for (var j = 0; j < e.getLength(); j++) {num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));}}return new QRPolynomial(num, 0);},/*** 多项式模运算* @param  {QRPolynomial} e 模多项式* @return {}*/mod: function (e) {var tl = this.getLength(),el = e.getLength();if (tl - el < 0) {return this;}var num = new Array(tl);for (var i = 0; i < tl; i++) {num[i] = this.get(i);}while (num.length >= el) {var ratio = QRMath.glog(num[0]) - QRMath.glog(e.get(0));for (var i = 0; i < e.getLength(); i++) {num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);}while (num[0] == 0) {num.shift();}}return new QRPolynomial(num, 0);}};//---------------------------------------------------------------------// RS_BLOCK_TABLE//---------------------------------------------------------------------/*二维码各个版本信息[块数, 每块中的数据块数, 每块中的信息块数]*/var RS_BLOCK_TABLE = [// L// M// Q// H// 1[1, 26, 19],[1, 26, 16],[1, 26, 13],[1, 26, 9],// 2[1, 44, 34],[1, 44, 28],[1, 44, 22],[1, 44, 16],// 3[1, 70, 55],[1, 70, 44],[2, 35, 17],[2, 35, 13],// 4[1, 100, 80],[2, 50, 32],[2, 50, 24],[4, 25, 9],// 5[1, 134, 108],[2, 67, 43],[2, 33, 15, 2, 34, 16],[2, 33, 11, 2, 34, 12],// 6[2, 86, 68],[4, 43, 27],[4, 43, 19],[4, 43, 15],// 7[2, 98, 78],[4, 49, 31],[2, 32, 14, 4, 33, 15],[4, 39, 13, 1, 40, 14],// 8[2, 121, 97],[2, 60, 38, 2, 61, 39],[4, 40, 18, 2, 41, 19],[4, 40, 14, 2, 41, 15],// 9[2, 146, 116],[3, 58, 36, 2, 59, 37],[4, 36, 16, 4, 37, 17],[4, 36, 12, 4, 37, 13],// 10[2, 86, 68, 2, 87, 69],[4, 69, 43, 1, 70, 44],[6, 43, 19, 2, 44, 20],[6, 43, 15, 2, 44, 16],// 11[4, 101, 81],[1, 80, 50, 4, 81, 51],[4, 50, 22, 4, 51, 23],[3, 36, 12, 8, 37, 13],// 12[2, 116, 92, 2, 117, 93],[6, 58, 36, 2, 59, 37],[4, 46, 20, 6, 47, 21],[7, 42, 14, 4, 43, 15],// 13[4, 133, 107],[8, 59, 37, 1, 60, 38],[8, 44, 20, 4, 45, 21],[12, 33, 11, 4, 34, 12],// 14[3, 145, 115, 1, 146, 116],[4, 64, 40, 5, 65, 41],[11, 36, 16, 5, 37, 17],[11, 36, 12, 5, 37, 13],// 15[5, 109, 87, 1, 110, 88],[5, 65, 41, 5, 66, 42],[5, 54, 24, 7, 55, 25],[11, 36, 12],// 16[5, 122, 98, 1, 123, 99],[7, 73, 45, 3, 74, 46],[15, 43, 19, 2, 44, 20],[3, 45, 15, 13, 46, 16],// 17[1, 135, 107, 5, 136, 108],[10, 74, 46, 1, 75, 47],[1, 50, 22, 15, 51, 23],[2, 42, 14, 17, 43, 15],// 18[5, 150, 120, 1, 151, 121],[9, 69, 43, 4, 70, 44],[17, 50, 22, 1, 51, 23],[2, 42, 14, 19, 43, 15],// 19[3, 141, 113, 4, 142, 114],[3, 70, 44, 11, 71, 45],[17, 47, 21, 4, 48, 22],[9, 39, 13, 16, 40, 14],// 20[3, 135, 107, 5, 136, 108],[3, 67, 41, 13, 68, 42],[15, 54, 24, 5, 55, 25],[15, 43, 15, 10, 44, 16],// 21[4, 144, 116, 4, 145, 117],[17, 68, 42],[17, 50, 22, 6, 51, 23],[19, 46, 16, 6, 47, 17],// 22[2, 139, 111, 7, 140, 112],[17, 74, 46],[7, 54, 24, 16, 55, 25],[34, 37, 13],// 23[4, 151, 121, 5, 152, 122],[4, 75, 47, 14, 76, 48],[11, 54, 24, 14, 55, 25],[16, 45, 15, 14, 46, 16],// 24[6, 147, 117, 4, 148, 118],[6, 73, 45, 14, 74, 46],[11, 54, 24, 16, 55, 25],[30, 46, 16, 2, 47, 17],// 25[8, 132, 106, 4, 133, 107],[8, 75, 47, 13, 76, 48],[7, 54, 24, 22, 55, 25],[22, 45, 15, 13, 46, 16],// 26[10, 142, 114, 2, 143, 115],[19, 74, 46, 4, 75, 47],[28, 50, 22, 6, 51, 23],[33, 46, 16, 4, 47, 17],// 27[8, 152, 122, 4, 153, 123],[22, 73, 45, 3, 74, 46],[8, 53, 23, 26, 54, 24],[12, 45, 15, 28, 46, 16],// 28[3, 147, 117, 10, 148, 118],[3, 73, 45, 23, 74, 46],[4, 54, 24, 31, 55, 25],[11, 45, 15, 31, 46, 16],// 29[7, 146, 116, 7, 147, 117],[21, 73, 45, 7, 74, 46],[1, 53, 23, 37, 54, 24],[19, 45, 15, 26, 46, 16],// 30[5, 145, 115, 10, 146, 116],[19, 75, 47, 10, 76, 48],[15, 54, 24, 25, 55, 25],[23, 45, 15, 25, 46, 16],// 31[13, 145, 115, 3, 146, 116],[2, 74, 46, 29, 75, 47],[42, 54, 24, 1, 55, 25],[23, 45, 15, 28, 46, 16],// 32[17, 145, 115],[10, 74, 46, 23, 75, 47],[10, 54, 24, 35, 55, 25],[19, 45, 15, 35, 46, 16],// 33[17, 145, 115, 1, 146, 116],[14, 74, 46, 21, 75, 47],[29, 54, 24, 19, 55, 25],[11, 45, 15, 46, 46, 16],// 34[13, 145, 115, 6, 146, 116],[14, 74, 46, 23, 75, 47],[44, 54, 24, 7, 55, 25],[59, 46, 16, 1, 47, 17],// 35[12, 151, 121, 7, 152, 122],[12, 75, 47, 26, 76, 48],[39, 54, 24, 14, 55, 25],[22, 45, 15, 41, 46, 16],// 36[6, 151, 121, 14, 152, 122],[6, 75, 47, 34, 76, 48],[46, 54, 24, 10, 55, 25],[2, 45, 15, 64, 46, 16],// 37[17, 152, 122, 4, 153, 123],[29, 74, 46, 14, 75, 47],[49, 54, 24, 10, 55, 25],[24, 45, 15, 46, 46, 16],// 38[4, 152, 122, 18, 153, 123],[13, 74, 46, 32, 75, 47],[48, 54, 24, 14, 55, 25],[42, 45, 15, 32, 46, 16],// 39[20, 147, 117, 4, 148, 118],[40, 75, 47, 7, 76, 48],[43, 54, 24, 22, 55, 25],[10, 45, 15, 67, 46, 16],// 40[19, 148, 118, 6, 149, 119],[18, 75, 47, 31, 76, 48],[34, 54, 24, 34, 55, 25],[20, 45, 15, 61, 46, 16]];/*** 根据数据获取对应版本* @return {[type]} [description]*/QRCodeAlg.prototype.getRightType = function () {for (var typeNumber = 1; typeNumber < 41; typeNumber++) {var rsBlock = RS_BLOCK_TABLE[(typeNumber - 1) * 4 + this.errorCorrectLevel];if (rsBlock == undefined) {throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + this.errorCorrectLevel);}var length = rsBlock.length / 3;var totalDataCount = 0;for (var i = 0; i < length; i++) {var count = rsBlock[i * 3 + 0];var dataCount = rsBlock[i * 3 + 2];totalDataCount += dataCount * count;}var lengthBytes = typeNumber > 9 ? 2 : 1;if (this.utf8bytes.length + lengthBytes < totalDataCount || typeNumber == 40) {this.typeNumber = typeNumber;this.rsBlock = rsBlock;this.totalDataCount = totalDataCount;break;}}};//---------------------------------------------------------------------// QRBitBuffer//---------------------------------------------------------------------function QRBitBuffer() {this.buffer = new Array();this.length = 0;}QRBitBuffer.prototype = {get: function (index) {var bufIndex = Math.floor(index / 8);return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1);},put: function (num, length) {for (var i = 0; i < length; i++) {this.putBit(((num >>> (length - i - 1)) & 1));}},putBit: function (bit) {var bufIndex = Math.floor(this.length / 8);if (this.buffer.length <= bufIndex) {this.buffer.push(0);}if (bit) {this.buffer[bufIndex] |= (0x80 >>> (this.length % 8));}this.length++;}};// xzeditlet qrcodeAlgObjCache = [];/*** 二维码构造函数，主要用于绘制* @param  {参数列表} opt 传递参数* @return {}*/var options;QRCode = function (opt) {//设置默认参数options = {text: '',size: 256,correctLevel: 3,background: '#ffffff',foreground: '#000000',pdground: '#000000',image: '',imageSize: 30,canvasId: opt.canvasId,context: opt.context,usingComponents: opt.usingComponents,showLoading: opt.showLoading,loadingText: opt.loadingText,};if (typeof opt === 'string') { // 只编码ASCII字符串opt = {text: opt};}if (opt) {for (var i in opt) {options[i] = opt[i];}}//使用QRCodeAlg创建二维码结构var qrCodeAlg = null;for (var i = 0, l = qrcodeAlgObjCache.length; i < l; i++) {if (qrcodeAlgObjCache[i].text == options.text && qrcodeAlgObjCache[i].text.correctLevel == options.correctLevel) {qrCodeAlg = qrcodeAlgObjCache[i].obj;break;}}if (i == l) {qrCodeAlg = new QRCodeAlg(options.text, options.correctLevel);qrcodeAlgObjCache.push({text: options.text,correctLevel: options.correctLevel,obj: qrCodeAlg});}/*** 计算矩阵点的前景色* @param {Obj} config* @param {Number} config.row 点x坐标* @param {Number} config.col 点y坐标* @param {Number} config.count 矩阵大小* @param {Number} config.options 组件的options* @return {String}*/let getForeGround = function (config) {var options = config.options;if (options.pdground && ((config.row > 1 && config.row < 5 && config.col > 1 && config.col < 5) ||(config.row > (config.count - 6) && config.row < (config.count - 2) && config.col > 1 && config.col < 5) ||(config.row > 1 && config.row < 5 && config.col > (config.count - 6) && config.col < (config.count - 2)))) {return options.pdground;}return options.foreground;}// 创建canvaslet createCanvas = function (options) {if (options.showLoading) {wx.showLoading({title: options.loadingText,mask: true});}var ctx = wx.createCanvasContext(options.canvasId, options.context);var count = qrCodeAlg.getModuleCount();var ratioSize = options.size;var ratioImgSize = options.imageSize;//计算每个点的长宽var tileW = (ratioSize / count).toPrecision(4);var tileH = (ratioSize / count).toPrecision(4);//绘制for (var row = 0; row < count; row++) {for (var col = 0; col < count; col++) {var w = (Math.ceil((col + 1) * tileW) - Math.floor(col * tileW));var h = (Math.ceil((row + 1) * tileW) - Math.floor(row * tileW));var foreground = getForeGround({row: row,col: col,count: count,options: options});ctx.setFillStyle(qrCodeAlg.modules[row][col] ? foreground : options.background);ctx.fillRect(Math.round(col * tileW), Math.round(row * tileH), w, h);}}if (options.image) {var x = Number(((ratioSize - ratioImgSize) / 2).toFixed(2));var y = Number(((ratioSize - ratioImgSize) / 2).toFixed(2));drawRoundedRect(ctx, x, y, ratioImgSize, ratioImgSize, 2, 6, true, true)ctx.drawImage(options.image, x, y, ratioImgSize, ratioImgSize);// 画圆角矩形function drawRoundedRect(ctxi, x, y, width, height, r, lineWidth, fill, stroke) {ctxi.setLineWidth(lineWidth);ctxi.setFillStyle(options.background);ctxi.setStrokeStyle(options.background);ctxi.beginPath(); // draw top and top right corner ctxi.moveTo(x + r, y);ctxi.arcTo(x + width, y, x + width, y + r, r); // draw right side and bottom right corner ctxi.arcTo(x + width, y + height, x + width - r, y + height, r); // draw bottom and bottom left corner ctxi.arcTo(x, y + height, x, y + height - r, r); // draw left and top left corner ctxi.arcTo(x, y, x + r, y, r);ctxi.closePath();if (fill) {ctxi.fill();}if (stroke) {ctxi.stroke();}}}setTimeout(() => {ctx.draw(true, () => {// 保存到临时区域setTimeout(() => {wx.canvasToTempFilePath({width: options.width,height: options.height,destWidth: options.width,destHeight: options.height,canvasId: options.canvasId,quality: Number(1),success: function (res) {if (options.cbResult) {options.cbResult(res.tempFilePath)}},fail: function (res) {if (options.cbResult) {options.cbResult(res)}},complete: function () {if (options.showLoading){wx.hideLoading();}},}, options.context);}, options.text.length + 100);});}, options.usingComponents ? 0 : 150);}createCanvas(options);// 空判定let empty = function (v) {let tp = typeof v,rt = false;if (tp == "number" && String(v) == "") {rt = true} else if (tp == "undefined") {rt = true} else if (tp == "object") {if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true} else if (tp == "string") {if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true} else if (tp == "function") {rt = false}return rt}};QRCode.prototype.clear = function (fn) {var ctx = wx.createCanvasContext(options.canvasId, options.context)ctx.clearRect(0, 0, options.size, options.size)ctx.draw(false, () => {if (fn) {fn()}})};
})()export default QRCode

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