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本文目录
- 前言
- 一、准备工作
- 二、示例代码
- 三、小程序wxml代码
- 四、js代码
- 五、js文件引入
- 总结：效果图
前言
微信小程序，作为现代移动互联网的重要一环，为开发者提供了一个便捷的平台，以实现各种功能，包括支付。本文将探讨如何在微信小程序前端开发中，通过使用weixin://wxpay/bizpayurl协议生成支付二维码，实现快速支付。
一、准备工作
在开始生成支付二维码之前，需要完成以下准备工作：
- 注册微信小程序：首先，你需要在微信公众平台注册一个小程序账号。
- 配置支付：在微信小程序管理后台，开通微信支付功能，并获取商户号（MCH ID）和API密钥（API Key）.
- 获取API权限：确保你的小程序有使用微信支付的权限。
二、示例代码
支付二维码的生成需要后端支持，因为涉及到支付安全和交易处理。后端需要根据微信支付API生成一个支付URL。
我们给定Java版本的后端生成URL代码给大家看看：
首先代码的步骤如下：
1、生成订单号：使用UUID生成唯一的订单号。
2、获取预支付ID：这通常是调用微信支付API后获得的，这里为了示例，我们使用UUID随机生成。
3、构建参数：创建一个包含所有必需参数的Map。
4、排序并签名：按照参数键的字典序对参数进行排序，并使用商户API密钥进行签名。
5、生成URL：将排序和签名后的参数拼接成一个查询字符串，并构建最终的支付二维码URL。
import java.security.SecureRandom;import java.util.Collections;import java.util.HashMap;import java.util.Map;import java.util.UUID;import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;import org.apache.commons.codec.binary.Hex;public class WeChatPayQRCodeGenerator { private static final String API_KEY = "你的API密钥"; private static final String MCH_ID = "你的商户号"; private static final String NOTIFY_URL = "你的服务器通知URL"; public static void main(String[] args) { String outTradeNo = generateOutTradeNo(); String prepayId = getPrepayId(outTradeNo); // 假设这是从你的支付系统获取的预支付交易会话标识 String qrCodeUrl = generateQRCodeUrl(prepayId); System.out.println("生成的支付二维码URL: " + qrCodeUrl); } private static String generateOutTradeNo() { return UUID.randomUUID().toString().replace("-", ""); } private static String getPrepayId(String outTradeNo) { // 这里应该是调用微信支付API获取prepay_id的过程，此处为了示例，我们随机生成一个 return UUID.randomUUID().toString().replace("-", ""); } private static String generateQRCodeUrl(String prepayId) { Map<String, String> parameters = new HashMap<>(); parameters.put("appid", "wx2421b1c4370ec43b"); parameters.put("mch_id", MCH_ID); parameters.put("nonce_str", UUID.randomUUID().toString().replace("-", "")); parameters.put("prepay_id", prepayId); parameters.put("result", "ok"); parameters.put("return", "http://yourdomain.com/wechatpay/return"); parameters.put("time_stamp", String.valueOf(System.currentTimeMillis() / 1000)); // 对参数按照key=value的格式，并按照key的ASCII码表中的顺序进行排序 StringBuilder sb = new StringBuilder(); for (Map.Entry<String, String> entry : parameters.entrySet()) { sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&"); } sb.deleteCharAt(sb.length() - 1); // 移除最后一个'&' try { // 使用API密钥对字符串进行签名 Mac hmac = Mac.getInstance("HmacSHA256"); SecretKeySpec secretKey = new SecretKeySpec(API_KEY.getBytes("UTF-8"), "HmacSHA256"); hmac.init(secretKey); String sign = new String(Hex.encodeHex(hmac.doFinal(sb.toString().getBytes("UTF-8")))); parameters.put("sign", sign); } catch (Exception e) { e.printStackTrace(); return null; } // 构建最终的URL return "weixin://wxpay/bizpayurl?" + toQueryString(parameters) + "#wechat_redirect"; } private static String toQueryString(Map<String, String> params) { StringBuilder sb = new StringBuilder(); for (Map.Entry<String, String> entry : params.entrySet()) { sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&"); } sb.deleteCharAt(sb.length() - 1); // 移除最后一个'&' return sb.toString(); }}然后前端调用就完事了。
<!-- 小程序页面的wxml文件 --><navigator url="weixin://wxpay/bizpayurl?参数..." open-type="navigate"> <button>立即支付</button></navigator>三、小程序wxml代码
<view> <canvas style="width: 400rpx;height: 400rpx;" canvas-id='canvas'></canvas></view>四、js代码
var QRCode = require('../../utils/qrcode.js');page({ data:{}, getQrcode() { // 生成二维码 app.http.getQrcode({ // 这里是请求后端接口获取短链接weixin://wxpay/bizpayurl id: this.data..id }).then(res => { let qrcode = new QRCode('canvas', { text: res.data, // weixin://wxpay/bizpayurl?pr=sZz**** width: 194, height: 194, colorDark: "black", colorLight: "white", correctLevel: QRCode.CorrectLevel.H, }); }) },})五、js文件引入
//Core code comes from https://github.com/davidshimjs/qrcodejs 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.data = data; this.parsedData = []; // Added to support UTF-8 Characters for (var i = 0, l = this.data.length; i < l; i++) { var byteArray = []; var code = this.data.charCodeAt(i); if (code > 0x10000) { byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18); byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12); byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6); byteArray[3] = 0x80 | (code & 0x3F); } else if (code > 0x800) { byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12); byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6); byteArray[2] = 0x80 | (code & 0x3F); } else if (code > 0x80) { byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6); byteArray[1] = 0x80 | (code & 0x3F); } else { byteArray[0] = code; } this.parsedData.push(byteArray); } this.parsedData = Array.prototype.concat.apply([], this.parsedData); if (this.parsedData.length != this.data.length) { this.parsedData.unshift(191); this.parsedData.unshift(187); this.parsedData.unshift(239); } } QR8bitByte.prototype = { getLength: function (buffer) { return this.parsedData.length; }, write: function (buffer) { for (var i = 0, l = this.parsedData.length; i < l; i++) { buffer.put(this.parsedData[i], 8); } } }; // QRCodeModel function 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 = 0xEC; QRCodeModel.PAD1 = 0x11; 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] = 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; }; var QRMode = { MODE_NUMBER: 1 << 0, MODE_ALPHA_NUM: 1 << 1, MODE_8BIT_BYTE: 1 << 2, MODE_KANJI: 1 << 3 }; 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: (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) { 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] |= (0x80 >>> (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 object QRCode = 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 options if (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 = wx.createCanvasContext(this.canvasId, this._htOption.usingIn) } else { _oContext = wx.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; var nTop = row * nHeight; _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 } wx.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```总结：效果图
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