标签：function ++ 微信 生成 二维码 options var col row
1、需求：项目需求是获取一个通行码get链接，需要转化成二维码，用户扫码之后发起请求进行远程开门。
2、思路：在微信小程序中生成二维码比较好用的是weapp-qrcode，去到官网https://github.com/yingye/weapp-qrcode，复制dist 目录下，weapp.qrcode.esm.js文件，粘贴到小程序项目，就可以用了。
3、实现:
wxml
<canvas class="myQrcode" style="width: 250rpx; height: 250rpx;" canvas-id="myQrcode"></canvas>
js
//引用
const qrcode= require('../../../utils/weapp.qrcode.esm.js')
//方法
setQrcode(){
qrcode({
width: 125,
height: 125,
canvasId: 'myQrcode',
text: '需要转化的链接',
})
},
4、效果：
5、以下是方便使用
/**
* weapp.qrcode.js v1.0.0 (https://github.com/yingye/weapp-qrcode#readme)
*/
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.drawQrcode = factory());
}(this, (function () {
'use strict';
var hasOwn = Object.prototype.hasOwnProperty;
var toStr = Object.prototype.toString;
var defineProperty = Object.defineProperty;
var gOPD = Object.getOwnPropertyDescriptor;
var isArray = function isArray(arr) {
if (typeof Array.isArray === 'function') {
return Array.isArray(arr);
}
return toStr.call(arr) === '[object Array]';
};
var isPlainObject = function isPlainObject(obj) {
if (!obj || toStr.call(obj) !== '[object Object]') {
return false;
}
var hasOwnConstructor = hasOwn.call(obj, 'constructor');
var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
// Not own constructor property must be Object
if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
return false;
}
// Own properties are enumerated firstly, so to speed up,
// if last one is own, then all properties are own.
var key;
for (key in obj) { /**/ }
return typeof key === 'undefined' || hasOwn.call(obj, key);
};
// If name is '__proto__', and Object.defineProperty is available, define __proto__ as an own property on target
var setProperty = function setProperty(target, options) {
if (defineProperty && options.name === '__proto__') {
defineProperty(target, options.name, {
enumerable: true,
configurable: true,
value: options.newValue,
writable: true
});
} else {
target[options.name] = options.newValue;
}
};
// Return undefined instead of __proto__ if '__proto__' is not an own property
var getProperty = function getProperty(obj, name) {
if (name === '__proto__') {
if (!hasOwn.call(obj, name)) {
return void 0;
} else if (gOPD) {
// In early versions of node, obj['__proto__'] is buggy when obj has
// __proto__ as an own property. Object.getOwnPropertyDescriptor() works.
return gOPD(obj, name).value;
}
}
return obj[name];
};
var extend = function extend() {
var options, name, src, copy, copyIsArray, clone;
var target = arguments[0];
var i = 1;
var length = arguments.length;
var deep = false;
// Handle a deep copy situation
if (typeof target === 'boolean') {
deep = target;
target = arguments[1] || {};
// skip the boolean and the target
i = 2;
}
if (target == null || (typeof target !== 'object' && typeof target !== 'function')) {
target = {};
}
for (; i < length; ++i) {
options = arguments[i];
// Only deal with non-null/undefined values
if (options != null) {
// Extend the base object
for (name in options) {
src = getProperty(target, name);
copy = getProperty(options, name);
// Prevent never-ending loop
if (target !== copy) {
// Recurse if we're merging plain objects or arrays
if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
if (copyIsArray) {
copyIsArray = false;
clone = src && isArray(src) ? src : [];
} else {
clone = src && isPlainObject(src) ? src : {};
}
// Never move original objects, clone them
setProperty(target, { name: name, newValue: extend(deep, clone, copy) });
// Don't bring in undefined values
} else if (typeof copy !== 'undefined') {
setProperty(target, { name: name, newValue: copy });
}
}
}
}
}
// Return the modified object
return target;
};
//---------------------------------------------------------------------
// 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
//
//---------------------------------------------------------------------
//---------------------------------------------------------------------
// QR8bitByte
//---------------------------------------------------------------------
function QR8bitByte(data) {
this.mode = QRMode.MODE_8BIT_BYTE;
this.data = data;
}
QR8bitByte.prototype = {
getLength: function (buffer) {
return this.data.length;
},
write: function (buffer) {
for (var i = 0; i < this.data.length; i++) {
// not JIS ...
buffer.put(this.data.charCodeAt(i), 8);
}
}
};
//---------------------------------------------------------------------
// QRCode
//---------------------------------------------------------------------
function QRCode(typeNumber, errorCorrectLevel) {
this.typeNumber = typeNumber;
this.errorCorrectLevel = errorCorrectLevel;
this.modules = null;
this.moduleCount = 0;
this.dataCache = null;
this.dataList = new Array();
}
QRCode.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 () {
// Calculate automatically typeNumber if provided is < 1
if (this.typeNumber < 1) {
var typeNumber = 1;
for (typeNumber = 1; typeNumber < 40; typeNumber++) {
var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, this.errorCorrectLevel);
var buffer = new QRBitBuffer();
var totalDataCount = 0;
for (var i = 0; i < rsBlocks.length; i++) {
totalDataCount += rsBlocks[i].dataCount;
}
for (var i = 0; i < this.dataList.length; i++) {
var data = this.dataList[i];
buffer.put(data.mode, 4);
buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber));
data.write(buffer);
}
if (buffer.getLengthInBits() <= totalDataCount * 8) break;
}
this.typeNumber = typeNumber;
}
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; //(col + row) % 3;
}
}
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 = QRCode.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);
// vertical
for (var i = 0; i < 15; i++) {
var mod = !test && (bits >> i & 1) == 1;
if (i < 6) {
this.modules[i][8] = mod;
} else if (i < 8) {
this.modules[i + 1][8] = mod;
} else {
this.modules[this.moduleCount - 15 + i][8] = mod;
}
}
// horizontal
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;
}
}
// fixed module
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;
}
}
}
}
};
QRCode.PAD0 = 0xEC;
QRCode.PAD1 = 0x11;
QRCode.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);
}
// calc num max data.
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 + ")");
}
// end code
if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
buffer.put(0, 4);
}
// padding
while (buffer.getLengthInBits() % 8 != 0) {
buffer.putBit(false);
}
// padding
while (true) {
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break;
}
buffer.put(QRCode.PAD0, 8);
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break;
}
buffer.put(QRCode.PAD1, 8);
}
return QRCode.createBytes(buffer, rsBlocks);
};
QRCode.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] = 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 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;
};
//---------------------------------------------------------------------
// QRMode
//---------------------------------------------------------------------
var QRMode = {
MODE_NUMBER: 1 << 0,
MODE_ALPHA_NUM: 1 << 1,
MODE_8BIT_BYTE: 1 << 2,
MODE_KANJI: 1 << 3
};
//---------------------------------------------------------------------
// QRErrorCorrectLevel
//---------------------------------------------------------------------
var QRErrorCorrectLevel = {
L: 1,
M: 0,
Q: 3,
H: 2
};
//---------------------------------------------------------------------
// QRMaskPattern
//---------------------------------------------------------------------
var QRMaskPattern = {
PATTERN000: 0,
PATTERN001: 1,
PATTERN010: 2,
PATTERN011: 3,
PATTERN100: 4,
PATTERN101: 5,
PATTERN110: 6,
PATTERN111: 7
};
//---------------------------------------------------------------------
// QRUtil
//---------------------------------------------------------------------
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: 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) {
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) {
// 1 - 9
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) {
// 10 - 26
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) {
// 27 - 40
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;
// LEVEL1
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;
}
}
}
// LEVEL2
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;
}
}
}
// LEVEL3
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;
}
}
}
// LEVEL4
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;
}
};
//---------------------------------------------------------------------
// QRMath
//---------------------------------------------------------------------
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;
}
//---------------------------------------------------------------------
// QRPolynomial
//---------------------------------------------------------------------
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);
}
// recursive call
return new QRPolynomial(num, 0).mod(e);
}
};
//---------------------------------------------------------------------
// QRRSBlock
//---------------------------------------------------------------------
function QRRSBlock(totalCount, dataCount) {
this.totalCount = totalCount;
this.dataCount = dataCount;
}
QRRSBlock.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]];
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 = new Array();
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;
}
};
//---------------------------------------------------------------------
// 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) == 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] |= 0x80 >>> this.length % 8;
}
this.length++;
}
};
// support Chinese
function utf16to8(str) {
var out, i, len, c;
out = '';
len = str.length;
for (i = 0; i < len; i++) {
c = str.charCodeAt(i);
if (c >= 0x0001 && c <= 0x007F) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | c >> 12 & 0x0F);
out += String.fromCharCode(0x80 | c >> 6 & 0x3F);
out += String.fromCharCode(0x80 | c >> 0 & 0x3F);
} else {
out += String.fromCharCode(0xC0 | c >> 6 & 0x1F);
out += String.fromCharCode(0x80 | c >> 0 & 0x3F);
}
}
return out;
}
function drawQrcode(options) {
options = options || {};
options = extend(true, {
width: 256,
height: 256,
x: 0,
y: 0,
typeNumber: -1,
correctLevel: QRErrorCorrectLevel.H,
background: '#ffffff',
foreground: '#000000',
image: {
imageResource: '',
dx: 0,
dy: 0,
dWidth: 100,
dHeight: 100
}
}, options);
if (!options.canvasId && !options.ctx) {
console.warn('please set canvasId or ctx!');
return;
}
createCanvas();
function createCanvas() {
// create the qrcode itself
var qrcode = new QRCode(options.typeNumber, options.correctLevel);
qrcode.addData(utf16to8(options.text));
qrcode.make();
// get canvas context
var ctx;
if (options.ctx) {
ctx = options.ctx;
} else {
ctx = options._this ? wx.createCanvasContext && wx.createCanvasContext(options.canvasId, options._this) : wx.createCanvasContext && wx.createCanvasContext(options.canvasId);
}
// compute tileW/tileH based on options.width/options.height
var tileW = options.width / qrcode.getModuleCount();
var tileH = options.height / qrcode.getModuleCount();
// draw in the canvas
for (var row = 0; row < qrcode.getModuleCount(); row++) {
for (var col = 0; col < qrcode.getModuleCount(); col++) {
var style = qrcode.isDark(row, col) ? options.foreground : options.background;
ctx.setFillStyle(style);
var w = Math.ceil((col + 1) * tileW) - Math.floor(col * tileW);
var h = Math.ceil((row + 1) * tileW) - Math.floor(row * tileW);
ctx.fillRect(Math.round(col * tileW) + options.x, Math.round(row * tileH) + options.y, w, h);
}
}
if (options.image.imageResource) {
ctx.drawImage(options.image.imageResource, options.image.dx, options.image.dy, options.image.dWidth, options.image.dHeight);
}
ctx.draw(false, function (e) {
options.callback && options.callback(e);
});
}
}
return drawQrcode;
})));
标签：function,++,微信,生成,二维码,options,var,col,row 来源： https://www.cnblogs.com/lovewhatIlove/p/15909015.html
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。