uniapp 生成海报二维码（微信小程序）

先下载qrcodenpm install qrcode

调用
community_poster.vue

	<template><view class="poster-page"><uv-navbar title="物业推广码" placeholder autoBack></uv-navbar><view class="community-info"><text class="community-name">{{ communityName }}</text><text class="community-desc">扫描下方二维码，绑定物业</text></view><property-poster ref="propertyPosterRef" :communityName="communityName" :bgImages="bgImages" :width="750" :height="668" :size="300" :qrCodeContent="qrCodeContent"@posterGenerated="handlePosterGenerated"></property-poster></view>
</template><script lang="ts" setup>
import { ref, onMounted } from 'vue'
import { onLoad } from '@dcloudio/uni-app'
import PropertyPoster from '@/components/propertyPoster/index.vue'
import { localImg } from '@/utils/util'// 页面参数
const communityId = ref('')
const communityName = ref('小区')
const qrCodeContent = ref('')
const bgImages = ref('')// 页面加载
onLoad((options: any) => {if (options.id) {communityId.value = options.id// 可以根据ID获取小区信息getCommunityInfo(options.id)}if (options.name) {communityName.value = options.name}// 生成二维码内容generateQrCodeContent()
})
function handlePosterGenerated(url: string) {console.log('接收到的海报图片路径:', url)posterUrl.value = url
}
// 获取小区信息
const getCommunityInfo = async (id: string) => {try {// 这里可以调用API获取小区详情// const res = await getCommunityDetail(id)// communityName.value = res.communityName} catch (error) {console.error('获取小区信息失败:', error)uni.showToast({title: '获取小区信息失败',icon: 'none'})}
}// 生成二维码内容
const generateQrCodeContent = () => {// 生成二维码内容和背景图，可以是小程序页面路径+参数   自己填写qrCodeContent.value = import.meta.env.VITE_APP_BASE_URL + '/admin/Properties/getProperCode/1920001749794516994'bgImages.value = localImg('/images/content/community.png')}
</script><style lang="scss" scoped>
.poster-page {min-height: 100vh;background-color: #F8F8F8;padding-bottom: 40rpx;
}.community-info {padding: 30rpx;text-align: center;
}.community-name {font-size: 36rpx;font-weight: bold;color: #333;display: block;margin-bottom: 10rpx;
}.community-desc {font-size: 28rpx;color: #666;
}
</style>

组件
components/propertyPoster/index.vue

<template><view class="poster-container"><!-- 海报预览区域 --><view class="poster-preview" v-if="posterUrl"><image :src="posterUrl" mode="widthFix" class="poster-image" @error="handleImageError":style="{ width: canvasWidth + 'rpx', height: canvasHeight + 'rpx' }" /></view><!-- 隐藏的Canvas --><view class="canvas-container"><canvas canvas-id="posterCanvas" id="posterCanvas" class="poster-canvas":style="{ width: canvasWidth + 'px', height: canvasHeight + 'px' }" /><canvas canvas-id="qrcodeCanvas" id="qrcodeCanvas" class="qrcode-canvas":style="{ width: size + 'px', height: size + 'px' }" /></view></view>
</template><script lang="ts" setup>
import { ref, onUnmounted, getCurrentInstance, nextTick } from 'vue'
import { storeToRefs } from 'pinia'
import { onReady } from '@dcloudio/uni-app'
import uQRCode from '@/utils/uqrcode.js'
import { useUserStore } from '@/stores/user'type ErrorType = 'download' | 'canvas' | 'qrcode' | 'save' | 'unknown'// 定义组件属性
const props = defineProps({communityName: {type: String,default: '幸福家园小区'},qrCodeContent: {type: String,required: true},bgImages: {type: String,required: true},bgColor: {type: String,default: '#ffffff'},width: {type: Number,default: 750},height: {type: Number,default: 1200},size: {type: Number,default: 400}
})const emits = defineEmits(['posterGenerated'])// 获取用户信息和应用信息
const userStore = useUserStore()
const { userInfo } = storeToRefs(userStore)
const instance = getCurrentInstance()// 海报相关参数
const canvasWidth = ref(props.width)
const canvasHeight = ref(props.height)
const posterUrl = ref('')
const generating = ref(false)// 图片加载失败处理
const handleImageError = () => {showToast('图片加载失败')
}/*** 下载图片资源*/
const downloadImage = async (url: string): Promise<string> => {try {const res = await uni.downloadFile({ url })if (res.statusCode === 200) {return res.tempFilePath}throw new Error(`下载失败(${res.statusCode})`)} catch (error) {throw new Error(`图片下载失败: ${error.message || error}`)}
}/*** 生成二维码并返回临时路径*/
const generateQRCode = async (): Promise<string> => {return new Promise((resolve, reject) => {uQRCode.make({canvasId: 'qrcodeCanvas',componentInstance: instance?.proxy,text: props.qrCodeContent,size: props.size,margin: 10,success: resolve,fail: (err) => reject(new Error(`二维码生成失败: ${err}`))})})
}/*** 将Canvas转换为临时文件路径*/
const canvasToTempFile = (canvasId: string): Promise<string> => {return new Promise((resolve, reject) => {uni.canvasToTempFilePath({canvasId,destWidth: canvasWidth.value * 2, // 提高清晰度destHeight: canvasHeight.value * 2,success: (res) => resolve(res.tempFilePath),fail: (err) => reject(new Error(`Canvas转换失败: ${err.errMsg || err}`))}, instance?.proxy)})
}/*** 绘制海报内容*/
const drawPosterContent = async (ctx: UniApp.CanvasContext) => {// 绘制背景ctx.setFillStyle(props.bgColor)ctx.fillRect(0, 0, canvasWidth.value, canvasHeight.value)// 绘制背景图片const bgImagePath = await downloadImage(props.bgImages)ctx.drawImage(bgImagePath, 0, 0, canvasWidth.value, canvasHeight.value)// 绘制小区名称if (props.communityName) {ctx.setFillStyle('#FFFFFF')ctx.setFontSize(30)const textWidth = ctx.measureText(props.communityName).widthconst x = (canvasWidth.value - textWidth) / 2ctx.fillText(props.communityName, x, 120)}// 生成并绘制二维码const qrSize = props.sizeconst qrX = (canvasWidth.value - qrSize) / 2const qrY = (canvasHeight.value - qrSize) / 2const qrCodePath = await generateQRCode()ctx.drawImage(qrCodePath, qrX, qrY, qrSize, qrSize)
}/*** 执行Canvas绘制*/
const executeCanvasDraw = (ctx: UniApp.CanvasContext): Promise<void> => {return new Promise((resolve) => {ctx.draw(false, () => {setTimeout(resolve, 300) // 确保绘制完成})})
}/*** 显示提示信息*/
const showToast = (message: string, icon: UniApp.ShowToastOptions['icon'] = 'none') => {uni.showToast({ title: message, icon })
}/*** 生成海报主函数*/
const generatePoster = async () => {if (generating.value) returngenerating.value = trueuni.showLoading({ title: '生成中...', mask: true })try {// 创建Canvas上下文const ctx = uni.createCanvasContext('posterCanvas', instance?.proxy)if (!ctx) {throw new Error('获取Canvas上下文失败')}// 绘制海报内容await drawPosterContent(ctx)// 执行绘制await executeCanvasDraw(ctx)// 转换为临时文件posterUrl.value = await canvasToTempFile('posterCanvas')emits('posterGenerated', posterUrl.value)showToast('生成成功')} catch (error) {console.error('生成海报失败:', error)showToast('生成海报失败')} finally {generating.value = falseuni.hideLoading()}
}/*** 保存海报到相册*/
const savePoster = async () => {if (!posterUrl.value) {showToast('请先生成海报')return}try {await uni.saveImageToPhotosAlbum({filePath: posterUrl.value})showToast('保存成功', 'success')} catch (error) {if (error.errMsg.includes('auth deny') || error.errMsg.includes('authorize no response')) {uni.showModal({title: '提示',content: '需要您授权保存图片到相册',success: (res) => res.confirm && uni.openSetting()})} else {showToast(`保存失败: ${error.errMsg || error}`)}}
}// 暴露方法给父组件
defineExpose({savePoster,generatePoster
})// 组件挂载后自动生成海报
onReady(() => {nextTick(() => {generatePoster()})
})// 页面卸载时清理资源
onUnmounted(() => {if (posterUrl.value) {// #ifdef MP-WEIXINuni.removeSavedFile({filePath: posterUrl.value,complete: () => console.log('临时文件已清理')})// #endif}
})
</script><style lang="scss" scoped>
.poster-container {padding: 20rpx;display: flex;flex-direction: column;align-items: center;
}.poster-preview {margin: 30rpx auto;width: 100%;display: flex;flex-direction: column;align-items: center;
}.poster-image {width: 100%;box-shadow: 0 4rpx 20rpx rgba(0, 0, 0, 0.1);border-radius: 20rpx;
}.canvas-container {position: fixed;left: -9999px;top: -9999px;z-index: -1;opacity: 0;
}.poster-canvas,
.qrcode-canvas {position: absolute;
}
</style>

uqrcode.js

//---------------------------------------------------------------------
// github https://github.com/Sansnn/uQRCode
//---------------------------------------------------------------------let uQRCode = {}; (function () {//---------------------------------------------------------------------// 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_BYTEthis.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 = typeNumberthis.errorCorrectLevel = errorCorrectLevelthis.modules = nullthis.moduleCount = 0this.dataCache = nullthis.dataList = []}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 < 1if (this.typeNumber < 1) {var typeNumber = 1for (typeNumber = 1; typeNumber < 40; typeNumber++) {var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, this.errorCorrectLevel)var buffer = new QRBitBuffer()var totalDataCount = 0for (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 + 17this.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) continuefor (var c = -1; c <= 7; c++) {if (col + c <= -1 || this.moduleCount <= col + c) continueif ((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 = 0var pattern = 0for (var i = 0; i < 8; i++) {this.makeImpl(true, i)var lostPoint = QRUtil.getLostPoint(this)if (i == 0 || minLostPoint > lostPoint) {minLostPoint = lostPointpattern = i}}return pattern},createMovieClip: function (target_mc, instance_name, depth) {var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth)var cs = 1this.make()for (var row = 0; row < this.modules.length; row++) {var y = row * csfor (var col = 0; col < this.modules[row].length; col++) {var x = col * csvar 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) == 1this.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) == 1this.modules[(i % 3) + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod}},setupTypeInfo: function (test, maskPattern) {var data = (this.errorCorrectLevel << 3) | maskPatternvar bits = QRUtil.getBCHTypeInfo(data)// verticalfor (var i = 0; i < 15; i++) {var mod = !test && ((bits >> i) & 1) == 1if (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}}// horizontalfor (var i = 0; i < 15; i++) {var mod = !test && ((bits >> i) & 1) == 1if (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},mapData: function (data, maskPattern) {var inc = -1var row = this.moduleCount - 1var bitIndex = 7var byteIndex = 0for (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 = falseif (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] = darkbitIndex--if (bitIndex == -1) {byteIndex++bitIndex = 7}}}row += incif (row < 0 || this.moduleCount <= row) {row -= incinc = -incbreak}}}},}QRCode.PAD0 = 0xecQRCode.PAD1 = 0x11QRCode.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 = 0for (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 codeif (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {buffer.put(0, 4)}// paddingwhile (buffer.getLengthInBits() % 8 != 0) {buffer.putBit(false)}// paddingwhile (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 = 0var maxDcCount = 0var maxEcCount = 0var dcdata = new Array(rsBlocks.length)var ecdata = new Array(rsBlocks.length)for (var r = 0; r < rsBlocks.length; r++) {var dcCount = rsBlocks[r].dataCountvar ecCount = rsBlocks[r].totalCount - dcCountmaxDcCount = 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 += dcCountvar 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].lengthecdata[r][i] = modIndex >= 0 ? modPoly.get(modIndex) : 0}}var totalCodeCount = 0for (var i = 0; i < rsBlocks.length; i++) {totalCodeCount += rsBlocks[i].totalCount}var data = new Array(totalCodeCount)var index = 0for (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 << 10while (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 << 12while (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 = 0while (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 == 0case QRMaskPattern.PATTERN001:return i % 2 == 0case QRMaskPattern.PATTERN010:return j % 3 == 0case QRMaskPattern.PATTERN011:return (i + j) % 3 == 0case QRMaskPattern.PATTERN100:return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0case QRMaskPattern.PATTERN101:return ((i * j) % 2) + ((i * j) % 3) == 0case QRMaskPattern.PATTERN110:return (((i * j) % 2) + ((i * j) % 3)) % 2 == 0case QRMaskPattern.PATTERN111:return (((i * j) % 3) + ((i + j) % 2)) % 2 == 0default: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 - 9switch (mode) {case QRMode.MODE_NUMBER:return 10case QRMode.MODE_ALPHA_NUM:return 9case QRMode.MODE_8BIT_BYTE:return 8case QRMode.MODE_KANJI:return 8default:throw new Error('mode:' + mode)}} else if (type < 27) {// 10 - 26switch (mode) {case QRMode.MODE_NUMBER:return 12case QRMode.MODE_ALPHA_NUM:return 11case QRMode.MODE_8BIT_BYTE:return 16case QRMode.MODE_KANJI:return 10default:throw new Error('mode:' + mode)}} else if (type < 41) {// 27 - 40switch (mode) {case QRMode.MODE_NUMBER:return 14case QRMode.MODE_ALPHA_NUM:return 13case QRMode.MODE_8BIT_BYTE:return 16case QRMode.MODE_KANJI:return 12default:throw new Error('mode:' + mode)}} else {throw new Error('type:' + type)}},getLostPoint: function (qrCode) {var moduleCount = qrCode.getModuleCount()var lostPoint = 0// LEVEL1for (var row = 0; row < moduleCount; row++) {for (var col = 0; col < moduleCount; col++) {var sameCount = 0var 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}}}// LEVEL2for (var row = 0; row < moduleCount - 1; row++) {for (var col = 0; col < moduleCount - 1; col++) {var count = 0if (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}}}// LEVEL3for (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}}}// LEVEL4var darkCount = 0for (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) / 5lostPoint += ratio * 10return 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 = 0while (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 callreturn new QRPolynomial(num, 0).mod(e)},}//---------------------------------------------------------------------// QRRSBlock//---------------------------------------------------------------------function QRRSBlock(totalCount, dataCount) {this.totalCount = totalCountthis.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 / 3var 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}}//---------------------------------------------------------------------// QRBitBuffer//---------------------------------------------------------------------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++},}//---------------------------------------------------------------------// Support Chinese//---------------------------------------------------------------------function utf16To8(text) {var result = ''var cfor (var i = 0; i < text.length; i++) {c = text.charCodeAt(i)if (c >= 0x0001 && c <= 0x007f) {result += text.charAt(i)} else if (c > 0x07ff) {result += String.fromCharCode(0xe0 | ((c >> 12) & 0x0f))result += String.fromCharCode(0x80 | ((c >> 6) & 0x3f))result += String.fromCharCode(0x80 | ((c >> 0) & 0x3f))} else {result += String.fromCharCode(0xc0 | ((c >> 6) & 0x1f))result += String.fromCharCode(0x80 | ((c >> 0) & 0x3f))}}return result}uQRCode = {defaults: {size: 238,margin: 0,backgroundColor: '#ffffff',foregroundColor: '#000000',fileType: 'png', // 'jpg', 'png'correctLevel: 0,typeNumber: -1,},make: function (options) {var defaultOptions = {canvasId: options.canvasId,componentInstance: options.componentInstance,text: options.text,size: this.defaults.size,margin: this.defaults.margin,backgroundColor: this.defaults.backgroundColor,foregroundColor: this.defaults.foregroundColor,fileType: this.defaults.fileType,correctLevel: this.defaults.correctLevel,typeNumber: this.defaults.typeNumber,}if (options) {for (var i in options) {defaultOptions[i] = options[i]}}options = defaultOptionsif (!options.canvasId) {console.error('uQRCode: Please set canvasId!')return}function createCanvas() {var qrcode = new QRCode(options.typeNumber, options.correctLevel)qrcode.addData(utf16To8(options.text))qrcode.make()var ctx = uni.createCanvasContext(options.canvasId, options.componentInstance)ctx.setFillStyle(options.backgroundColor)ctx.fillRect(0, 0, options.size, options.size)var tileW = (options.size - options.margin * 2) / qrcode.getModuleCount()var tileH = tileWfor (var row = 0; row < qrcode.getModuleCount(); row++) {for (var col = 0; col < qrcode.getModuleCount(); col++) {var style = qrcode.isDark(row, col) ? options.foregroundColor : options.backgroundColorctx.setFillStyle(style)var x = Math.round(col * tileW) + options.marginvar y = Math.round(row * tileH) + options.marginvar w = Math.ceil((col + 1) * tileW) - Math.floor(col * tileW)var h = Math.ceil((row + 1) * tileW) - Math.floor(row * tileW)ctx.fillRect(x, y, w, h)}}// if (options.image) {//   uni.getImageInfo({//     src: options.image,//     success: function (res) {//       var ratioSize = options.size//       var ratioImgSize = options.imageSize//       var x = Number(((ratioSize - ratioImgSize) / 2).toFixed(2))//       var y = Number(((ratioSize - ratioImgSize) / 2).toFixed(2))//       console.log(//         '[  options.image, x, y, ratioImgSize, ratioImgSize ] >',//         res,//         x,//         y,//         ratioImgSize,//         ratioImgSize//       )//       ctx.drawImage(res.path, 0, 0, ratioImgSize, ratioImgSize)//     },//   })// }setTimeout(function () {ctx.draw(true, function () {setTimeout(function () {let imgSize = options.size * 5uni.canvasToTempFilePath({canvasId: options.canvasId,fileType: options.fileType,width: imgSize,height: imgSize,destWidth: imgSize,destHeight: imgSize,success: function (res) {options.success && options.success(res.tempFilePath)},fail: function (error) {options.fail && options.fail(error)},complete: function (res) {options.complete && options.complete(res)},},options.componentInstance)}, options.text.length + 100)})}, 500)}createCanvas()},}})()export default uQRCode