【微信小程序使用canvas绘制二维码】

1，在util文件夹中的common.js

//引入
import drawQrcode from './qrcode.min.js';
import draw2dQrcode from './weapp.qrcode.esm.js';//导出封装的公用方法
export default{//老版二维码：canvas-id="testQrcode"qrcode(canvas,text,width,height){drawQrcode({width: width || 160,height: height || 160,canvasId: canvas,typeNumber: 4,text: text,callback(e) {}})},//推荐使用新版二维码：type='id'qrcode2d(canvasId,text){const query = wx.createSelectorQuery()query.select('#'+canvasId).fields({node: true,size: true}).exec((res) => {draw2dQrcode({canvas: res[0].node,canvasId: canvasId,padding: 0,background: '#ffffff',foreground: '#000000',text: text,})})},//新版二维码：中间有logo图片qrcode2dLogo(canvasId,text,logo){const query = wx.createSelectorQuery()query.select('#'+canvasId).fields({node: true,size: true}).exec(async (res) => {var canvas = res[0].nodevar img = canvas.createImage();img.src = logo || "https://gimg2.baidu.com/image_search/src=http%3A%2F%2Finews.gtimg.com%2Fnewsapp_match%2F0%2F10712419761%2F0.jpg&refer=http%3A%2F%2Finews.gtimg.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1643439365&t=3e236016e3b2faa24c36ab400ef05369";img.onload = function () {var options = {canvas: canvas,canvasId: canvasId,padding: 0,background: '#fff',foreground: '#000000',text: text,image: {imageResource: img,width: 40, height: 40 }}draw2dQrcode(options);};})}
}

2，使用

(1) index.wxml

// index.wxml
<view class="list-view"><view class="item" bindtap="goDetail"><view class="fix-icon" catchtap="showCode">二维码</view><view class="img"></view><view class="right"><view class="title">橄榄油精华</view><view class="price">￥129</view></view></view>
</view>
<view class="modal-view" wx:if="{{codeStatus}}"><view class="white-inview"><!--知识点：catchtap不冒泡，只触发子标签事件，不触发父标签 --><view class="wrong-view" catchtap="hideCode"><icon type="clear" size='26' ></icon></view><view class="qrcode-view"><canvas type="2d" style="width: 320rpx;height: 320rpx;" id="code"></canvas><!-- <canvas canvas-id="testQrcode"></canvas> --></view></view>
</view>

(2)index.js

 //引入
import util from '../../../utils/common';
Page({data: {codeStatus:false},goDetail(){console.log('去详情页')},showCode(){console.log(1)this.setData({codeStatus:true},() =>{//使用：传图片格式png\jpeg\jpg都可util.qrcode2dLogo('code','798','/img/1.jpeg')// util.qrcode2d('code','7788')//  util.qrcode('testQrcode','77889')})},hideCode(){this.setData({codeStatus:false})},
})

(3)index.wxss

.list-view{margin: 20rpx;padding: 30rpx 20rpx;background-color: #fff;border-radius: 10rpx;
}
.list-view .item{display: flex;flex-direction: row;position: relative;
}
.list-view .item .img{width: 190rpx;height: 190rpx;border-radius: 10rpx;margin-right: 40rpx;border: 1rpx solid #c0c0c0;
}
.list-view .item .right{flex: 1;
}
.list-view .right .title{font-weight: 600;font-size: 34rpx;margin-bottom: 30rpx;
}
.list-view .item .fix-icon{position: absolute;top: -10rpx;right: 0rpx;font-size: 26rpx;
}/* 遮罩层 */
.modal-view{position: fixed;top: 0;left: 0;right: 0;bottom: 0;background: rgba(0, 0, 0, 0.4);display: flex;/* align-items: center;justify-content: center; */
}
.white-inview{position: relative;width: 400rpx;height: 400rpx;padding: 30rpx;border-radius: 10rpx;background-color: #fff;margin: 50% auto;
}
.wrong-view{position: absolute;top: 10rpx;right: 10rpx;z-index: 99;
}
.qrcode-view{margin: 50rpx 40rpx;
}

3，js文件

(1)qrcode.min.js

//
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l=0;for(n=0;n<e;n++)for(o=0;o<e;o++)t.isDark(o,n)&&l++;return r+=10*(Math.abs(100*l/e/e-50)/5)}},y={glog:function(t){if(t<1)throw new Error("glog("+t+")");return y.LOG_TABLE[t]},gexp:function(t){for(;t<0;)t+=255;for(;t>=256;)t-=255;return y.EXP_TABLE[t]},EXP_TABLE:new Array(256),LOG_TABLE:new Array(256)},E=0;E<8;E++)y.EXP_TABLE[E]=1<<E;for(E=8;E<256;E++)y.EXP_TABLE[E]=y.EXP_TABLE[E-4]^y.EXP_TABLE[E-5]^y.EXP_TABLE[E-6]^y.EXP_TABLE[E-8];for(E=0;E<255;E++)y.LOG_TABLE[y.EXP_TABLE[E]]=E;function A(t,e){if(void 0==t.length)throw new Error(t.length+"/"+e);for(var r=0;r<t.length&&0==t[r];)r++;this.num=new Array(t.length-r+e);for(var o=0;o<t.length-r;o++)this.num[o]=t[o+r]}function _(t,e){this.totalCount=t,this.dataCount=e}function D(){this.buffer=new Array,this.length=0}return A.prototype={get:function(t){return this.num[t]},getLength:function(){return this.num.length},multiply:function(t){for(var e=new Array(this.getLength()+t.getLength()-1),r=0;r<this.getLength();r++)for(var o=0;o<t.getLength();o++)e[r+o]^=y.gexp(y.glog(this.get(r))+y.glog(t.get(o)));return new A(e,0)},mod:function(t){if(this.getLength()-t.getLength()<0)return this;for(var e=y.glog(this.get(0))-y.glog(t.get(0)),r=new Array(this.getLength()),o=0;o<this.getLength();o++)r[o]=this.get(o);for(o=0;o<t.getLength();o++)r[o]^=y.gexp(y.glog(t.get(o))+e);return new A(r,0).mod(t)}},_.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]],_.getRSBlocks=function(t,e){var r=_.getRsBlockTable(t,e);if(void 0==r)throw new Error("bad rs block @ typeNumber:"+t+"/errorCorrectLevel:"+e);for(var o=r.length/3,n=new Array,i=0;i<o;i++)for(var a=r[3*i+0],u=r[3*i+1],s=r[3*i+2],h=0;h<a;h++)n.push(new _(u,s));return n},_.getRsBlockTable=function(t,e){switch(e){case g.L:return _.RS_BLOCK_TABLE[4*(t-1)+0];case g.M:return _.RS_BLOCK_TABLE[4*(t-1)+1];case g.Q:return _.RS_BLOCK_TABLE[4*(t-1)+2];case g.H:return _.RS_BLOCK_TABLE[4*(t-1)+3];default:return}},D.prototype={get:function(t){var e=Math.floor(t/8);return 1==(this.buffer[e]>>>7-t%8&1)},put:function(t,e){for(var r=0;r<e;r++)this.putBit(1==(t>>>e-r-1&1))},getLengthInBits:function(){return this.length},putBit:function(t){var e=Math.floor(this.length/8);this.buffer.length<=e&&this.buffer.push(0),t&&(this.buffer[e]|=128>>>this.length%8),this.length++}},function(t){t=t||{},(t=s(!0,{width:256,height:256,x:0,y:0,typeNumber:-1,correctLevel:g.H,background:"#ffffff",foreground:"#000000",image:{imageResource:"",dx:0,dy:0,dWidth:100,dHeight:100}},t)).canvasId||t.ctx?function(){var e,r=new l(t.typeNumber,t.correctLevel);r.addData(function(t){var e,r,o,n;for(e="",o=t.length,r=0;r<o;r++)(n=t.charCodeAt(r))>=1&&n<=127?e+=t.charAt(r):n>2047?(e+=String.fromCharCode(224|n>>12&15),e+=String.fromCharCode(128|n>>6&63),e+=String.fromCharCode(128|n>>0&63)):(e+=String.fromCharCode(192|n>>6&31),e+=String.fromCharCode(128|n>>0&63));return e}(t.text)),r.make(),e=t.ctx?t.ctx:t._this?wx.createCanvasContext&&wx.createCanvasContext(t.canvasId,t._this):wx.createCanvasContext&&wx.createCanvasContext(t.canvasId);for(var o=t.width/r.getModuleCount(),n=t.height/r.getModuleCount(),i=0;i<r.getModuleCount();i++)for(var a=0;a<r.getModuleCount();a++){var u=r.isDark(i,a)?t.foreground:t.background;e.setFillStyle(u);var s=Math.ceil((a+1)*o)-Math.floor(a*o),h=Math.ceil((i+1)*o)-Math.floor(i*o);e.fillRect(Math.round(a*o)+t.x,Math.round(i*n)+t.y,s,h)}t.image.imageResource&&e.drawImage(t.image.imageResource,t.image.dx,t.image.dy,t.image.dWidth,t.image.dHeight),e.draw(!1,function(e){t.callback&&t.callback(e)})}():console.warn("please set canvasId or ctx!")}});

(2)weapp.qrcode.esm.js

var hasOwn=Object.prototype.hasOwnProperty,toStr=Object.prototype.toString,defineProperty=Object.defineProperty,gOPD=Object.getOwnPropertyDescriptor,isArray=function(t){return"function"==typeof Array.isArray?Array.isArray(t):"[object Array]"===toStr.call(t)},isPlainObject=function(t){if(!t||"[object Object]"!==toStr.call(t))return!1;var e,r=hasOwn.call(t,"constructor"),o=t.constructor&&t.constructor.prototype&&hasOwn.call(t.constructor.prototype,"isPrototypeOf");if(t.constructor&&!r&&!o)return!1;for(e in t);return void 0===e||hasOwn.call(t,e)},setProperty=function(t,e){defineProperty&&"__proto__"===e.name?defineProperty(t,e.name,{enumerable:!0,configurable:!0,value:e.newValue,writable:!0}):t[e.name]=e.newValue},getProperty=function(t,e){if("__proto__"===e){if(!hasOwn.call(t,e))return;if(gOPD)return gOPD(t,e).value}return t[e]},extend=function t(){var e,r,o,n,i,a,s=arguments[0],u=1,l=arguments.length,h=!1;for("boolean"==typeof s&&(h=s,s=arguments[1]||{},u=2),(null==s||"object"!=typeof s&&"function"!=typeof s)&&(s={});u<l;++u)if(null!=(e=arguments[u]))for(r in e)o=getProperty(s,r),s!==(n=getProperty(e,r))&&(h&&n&&(isPlainObject(n)||(i=isArray(n)))?(i?(i=!1,a=o&&isArray(o)?o:[]):a=o&&isPlainObject(o)?o:{},setProperty(s,{name:r,newValue:t(h,a,n)})):void 0!==n&&setProperty(s,{name:r,newValue:n}));return s};function QR8bitByte(t){this.mode=QRMode.MODE_8BIT_BYTE,this.data=t}function QRCode(t,e){this.typeNumber=t,this.errorCorrectLevel=e,this.modules=null,this.moduleCount=0,this.dataCache=null,this.dataList=new Array}QR8bitByte.prototype={getLength:function(t){return this.data.length},write:function(t){for(var e=0;e<this.data.length;e++)t.put(this.data.charCodeAt(e),8)}},QRCode.prototype={addData:function(t){var e=new QR8bitByte(t);this.dataList.push(e),this.dataCache=null},isDark:function(t,e){if(t<0||this.moduleCount<=t||e<0||this.moduleCount<=e)throw new Error(t+","+e);return this.modules[t][e]},getModuleCount:function(){return this.moduleCount},make:function(){if(this.typeNumber<1){var t=1;for(t=1;t<40;t++){for(var e=QRRSBlock.getRSBlocks(t,this.errorCorrectLevel),r=new QRBitBuffer,o=0,n=0;n<e.length;n++)o+=e[n].dataCount;for(n=0;n<this.dataList.length;n++){var i=this.dataList[n];r.put(i.mode,4),r.put(i.getLength(),QRUtil.getLengthInBits(i.mode,t)),i.write(r)}if(r.getLengthInBits()<=8*o)break}this.typeNumber=t}this.makeImpl(!1,this.getBestMaskPattern())},makeImpl:function(t,e){this.moduleCount=4*this.typeNumber+17,this.modules=new Array(this.moduleCount);for(var r=0;r<this.moduleCount;r++){this.modules[r]=new Array(this.moduleCount);for(var o=0;o<this.moduleCount;o++)this.modules[r][o]=null}this.setupPositionProbePattern(0,0),this.setupPositionProbePattern(this.moduleCount-7,0),this.setupPositionProbePattern(0,this.moduleCount-7),this.setupPositionAdjustPattern(),this.setupTimingPattern(),this.setupTypeInfo(t,e),this.typeNumber>=7&&this.setupTypeNumber(t),null==this.dataCache&&(this.dataCache=QRCode.createData(this.typeNumber,this.errorCorrectLevel,this.dataList)),this.mapData(this.dataCache,e)},setupPositionProbePattern:function(t,e){for(var r=-1;r<=7;r++)if(!(t+r<=-1||this.moduleCount<=t+r))for(var o=-1;o<=7;o++)e+o<=-1||this.moduleCount<=e+o||(this.modules[t+r][e+o]=0<=r&&r<=6&&(0==o||6==o)||0<=o&&o<=6&&(0==r||6==r)||2<=r&&r<=4&&2<=o&&o<=4)},getBestMaskPattern:function(){for(var t=0,e=0,r=0;r<8;r++){this.makeImpl(!0,r);var o=QRUtil.getLostPoint(this);(0==r||t>o)&&(t=o,e=r)}return e},createMovieClip:function(t,e,r){var o=t.createEmptyMovieClip(e,r);this.make();for(var n=0;n<this.modules.length;n++)for(var i=1*n,a=0;a<this.modules[n].length;a++){var s=1*a;this.modules[n][a]&&(o.beginFill(0,100),o.moveTo(s,i),o.lineTo(s+1,i),o.lineTo(s+1,i+1),o.lineTo(s,i+1),o.endFill())}return o},setupTimingPattern:function(){for(var t=8;t<this.moduleCount-8;t++)null==this.modules[t][6]&&(this.modules[t][6]=t%2==0);for(var e=8;e<this.moduleCount-8;e++)null==this.modules[6][e]&&(this.modules[6][e]=e%2==0)},setupPositionAdjustPattern:function(){for(var t=QRUtil.getPatternPosition(this.typeNumber),e=0;e<t.length;e++)for(var r=0;r<t.length;r++){var o=t[e],n=t[r];if(null==this.modules[o][n])for(var i=-2;i<=2;i++)for(var a=-2;a<=2;a++)this.modules[o+i][n+a]=-2==i||2==i||-2==a||2==a||0==i&&0==a}},setupTypeNumber:function(t){for(var e=QRUtil.getBCHTypeNumber(this.typeNumber),r=0;r<18;r++){var o=!t&&1==(e>>r&1);this.modules[Math.floor(r/3)][r%3+this.moduleCount-8-3]=o}for(r=0;r<18;r++){o=!t&&1==(e>>r&1);this.modules[r%3+this.moduleCount-8-3][Math.floor(r/3)]=o}},setupTypeInfo:function(t,e){for(var r=this.errorCorrectLevel<<3|e,o=QRUtil.getBCHTypeInfo(r),n=0;n<15;n++){var i=!t&&1==(o>>n&1);n<6?this.modules[n][8]=i:n<8?this.modules[n+1][8]=i:this.modules[this.moduleCount-15+n][8]=i}for(n=0;n<15;n++){i=!t&&1==(o>>n&1);n<8?this.modules[8][this.moduleCount-n-1]=i:n<9?this.modules[8][15-n-1+1]=i:this.modules[8][15-n-1]=i}this.modules[this.moduleCount-8][8]=!t},mapData:function(t,e){for(var r=-1,o=this.moduleCount-1,n=7,i=0,a=this.moduleCount-1;a>0;a-=2)for(6==a&&a--;;){for(var s=0;s<2;s++)if(null==this.modules[o][a-s]){var u=!1;i<t.length&&(u=1==(t[i]>>>n&1)),QRUtil.getMask(e,o,a-s)&&(u=!u),this.modules[o][a-s]=u,-1==--n&&(i++,n=7)}if((o+=r)<0||this.moduleCount<=o){o-=r,r=-r;break}}}},QRCode.PAD0=236,QRCode.PAD1=17,QRCode.createData=function(t,e,r){for(var o=QRRSBlock.getRSBlocks(t,e),n=new QRBitBuffer,i=0;i<r.length;i++){var a=r[i];n.put(a.mode,4),n.put(a.getLength(),QRUtil.getLengthInBits(a.mode,t)),a.write(n)}var s=0;for(i=0;i<o.length;i++)s+=o[i].dataCount;if(n.getLengthInBits()>8*s)throw new Error("code length overflow. ("+n.getLengthInBits()+">"+8*s+")");for(n.getLengthInBits()+4<=8*s&&n.put(0,4);n.getLengthInBits()%8!=0;)n.putBit(!1);for(;!(n.getLengthInBits()>=8*s||(n.put(QRCode.PAD0,8),n.getLengthInBits()>=8*s));)n.put(QRCode.PAD1,8);return QRCode.createBytes(n,o)},QRCode.createBytes=function(t,e){for(var r=0,o=0,n=0,i=new Array(e.length),a=new Array(e.length),s=0;s<e.length;s++){var u=e[s].dataCount,l=e[s].totalCount-u;o=Math.max(o,u),n=Math.max(n,l),i[s]=new Array(u);for(var h=0;h<i[s].length;h++)i[s][h]=255&t.buffer[h+r];r+=u;var f=QRUtil.getErrorCorrectPolynomial(l),g=new QRPolynomial(i[s],f.getLength()-1).mod(f);a[s]=new Array(f.getLength()-1);for(h=0;h<a[s].length;h++){var c=h+g.getLength()-a[s].length;a[s][h]=c>=0?g.get(c):0}}var d=0;for(h=0;h<e.length;h++)d+=e[h].totalCount;var R=new Array(d),m=0;for(h=0;h<o;h++)for(s=0;s<e.length;s++)h<i[s].length&&(R[m++]=i[s][h]);for(h=0;h<n;h++)for(s=0;s<e.length;s++)h<a[s].length&&(R[m++]=a[s][h]);return R};for(var QRMode={MODE_NUMBER:1,MODE_ALPHA_NUM:2,MODE_8BIT_BYTE:4,MODE_KANJI:8},QRErrorCorrectLevel={L:1,M:0,Q:3,H:2},QRMaskPattern={PATTERN000:0,PATTERN001:1,PATTERN010:2,PATTERN011:3,PATTERN100:4,PATTERN101:5,PATTERN110:6,PATTERN111:7},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]],G15:1335,G18:7973,G15_MASK:21522,getBCHTypeInfo:function(t){for(var e=t<<10;QRUtil.getBCHDigit(e)-QRUtil.getBCHDigit(QRUtil.G15)>=0;)e^=QRUtil.G15<<QRUtil.getBCHDigit(e)-QRUtil.getBCHDigit(QRUtil.G15);return(t<<10|e)^QRUtil.G15_MASK},getBCHTypeNumber:function(t){for(var e=t<<12;QRUtil.getBCHDigit(e)-QRUtil.getBCHDigit(QRUtil.G18)>=0;)e^=QRUtil.G18<<QRUtil.getBCHDigit(e)-QRUtil.getBCHDigit(QRUtil.G18);return t<<12|e},getBCHDigit:function(t){for(var e=0;0!=t;)e++,t>>>=1;return e},getPatternPosition:function(t){return QRUtil.PATTERN_POSITION_TABLE[t-1]},getMask:function(t,e,r){switch(t){case QRMaskPattern.PATTERN000:return(e+r)%2==0;case QRMaskPattern.PATTERN001:return e%2==0;case QRMaskPattern.PATTERN010:return r%3==0;case QRMaskPattern.PATTERN011:return(e+r)%3==0;case QRMaskPattern.PATTERN100:return(Math.floor(e/2)+Math.floor(r/3))%2==0;case QRMaskPattern.PATTERN101:return e*r%2+e*r%3==0;case QRMaskPattern.PATTERN110:return(e*r%2+e*r%3)%2==0;case QRMaskPattern.PATTERN111:return(e*r%3+(e+r)%2)%2==0;default:throw new Error("bad maskPattern:"+t)}},getErrorCorrectPolynomial:function(t){for(var e=new QRPolynomial([1],0),r=0;r<t;r++)e=e.multiply(new QRPolynomial([1,QRMath.gexp(r)],0));return e},getLengthInBits:function(t,e){if(1<=e&&e<10)switch(t){case QRMode.MODE_NUMBER:return 10;case QRMode.MODE_ALPHA_NUM:return 9;case QRMode.MODE_8BIT_BYTE:case QRMode.MODE_KANJI:return 8;default:throw new Error("mode:"+t)}else if(e<27)switch(t){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:"+t)}else{if(!(e<41))throw new Error("type:"+e);switch(t){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:"+t)}}},getLostPoint:function(t){for(var e=t.getModuleCount(),r=0,o=0;o<e;o++)for(var n=0;n<e;n++){for(var i=0,a=t.isDark(o,n),s=-1;s<=1;s++)if(!(o+s<0||e<=o+s))for(var u=-1;u<=1;u++)n+u<0||e<=n+u||0==s&&0==u||a==t.isDark(o+s,n+u)&&i++;i>5&&(r+=3+i-5)}for(o=0;o<e-1;o++)for(n=0;n<e-1;n++){var l=0;t.isDark(o,n)&&l++,t.isDark(o+1,n)&&l++,t.isDark(o,n+1)&&l++,t.isDark(o+1,n+1)&&l++,0!=l&&4!=l||(r+=3)}for(o=0;o<e;o++)for(n=0;n<e-6;n++)t.isDark(o,n)&&!t.isDark(o,n+1)&&t.isDark(o,n+2)&&t.isDark(o,n+3)&&t.isDark(o,n+4)&&!t.isDark(o,n+5)&&t.isDark(o,n+6)&&(r+=40);for(n=0;n<e;n++)for(o=0;o<e-6;o++)t.isDark(o,n)&&!t.isDark(o+1,n)&&t.isDark(o+2,n)&&t.isDark(o+3,n)&&t.isDark(o+4,n)&&!t.isDark(o+5,n)&&t.isDark(o+6,n)&&(r+=40);var h=0;for(n=0;n<e;n++)for(o=0;o<e;o++)t.isDark(o,n)&&h++;return r+=10*(Math.abs(100*h/e/e-50)/5)}},QRMath={glog:function(t){if(t<1)throw new Error("glog("+t+")");return QRMath.LOG_TABLE[t]},gexp:function(t){for(;t<0;)t+=255;for(;t>=256;)t-=255;return QRMath.EXP_TABLE[t]},EXP_TABLE:new Array(256),LOG_TABLE:new Array(256)},i=0;i<8;i++)QRMath.EXP_TABLE[i]=1<<i;for(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(i=0;i<255;i++)QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]]=i;function QRPolynomial(t,e){if(void 0==t.length)throw new Error(t.length+"/"+e);for(var r=0;r<t.length&&0==t[r];)r++;this.num=new Array(t.length-r+e);for(var o=0;o<t.length-r;o++)this.num[o]=t[o+r]}function QRRSBlock(t,e){this.totalCount=t,this.dataCount=e}function QRBitBuffer(){this.buffer=new Array,this.length=0}function utf16to8(t){var e,r,o,n;for(e="",o=t.length,r=0;r<o;r++)(n=t.charCodeAt(r))>=1&&n<=127?e+=t.charAt(r):n>2047?(e+=String.fromCharCode(224|n>>12&15),e+=String.fromCharCode(128|n>>6&63),e+=String.fromCharCode(128|n>>0&63)):(e+=String.fromCharCode(192|n>>6&31),e+=String.fromCharCode(128|n>>0&63));return e}function drawQrcode(t,e){if(t=t||{},(t=extend(!0,{canvasId:"myQrcode",text:"爱一个人就要勇敢说出来",width:260,height:260,padding:20,typeNumber:-1,correctLevel:QRErrorCorrectLevel.H,background:"#ffffff",foreground:"#000000",image:{imageResource:"",width:80,height:80,round:!0}},t)).canvasId||t.canvas){if(t.paddingColor||(t.paddingColor=t.background),e){var r=new QRCode(t.typeNumber,t.correctLevel);return r.addData(utf16to8(t.text)),r.make(),new Promise(function(t,e){t(r)})}return new Promise(function(e,r){return e(function(){var e=new QRCode(t.typeNumber,t.correctLevel);e.addData(utf16to8(t.text)),e.make();const r=wx.getSystemInfoSync().pixelRatio;var o=t.canvas;const n=o.getContext("2d");o.width=t.width*r,o.height=t.width*r;const i=o.width;n.fillStyle=t.paddingColor,n.fillRect(0,0,i+2*t.padding,i+2*t.padding);for(var a=(i-2*t.padding)/e.getModuleCount(),s=(i-2*t.padding)/e.getModuleCount(),u=0;u<e.getModuleCount();u++)for(var l=0;l<e.getModuleCount();l++){n.fillStyle=e.isDark(u,l)?t.foreground:t.background;var h=Math.ceil((l+1)*a)-Math.floor(l*a),f=Math.ceil((u+1)*a)-Math.floor(u*a);n.fillRect(Math.round(l*a)+t.padding,Math.round(u*s)+t.padding,h,f)}if(t.image.imageResource){const e=t.image.width*r,o=t.image.height*r,a=(i-e)/2,s=(i-o)/2;if(t.image.round){const o=t.image.width*r+30,u=(i-o)/2,l=o/2,h=u+l;n.beginPath(),n.arc(h,h,l,0,2*Math.PI),n.fillStyle="#ffffff",n.fill(),n.restore();const f=e/2,g=a+f,c=s+f;n.beginPath(),n.arc(g,c,f,0,2*Math.PI),n.clip(),n.drawImage(t.image.imageResource,a,s,e,e),n.restore()}else n.drawImage(t.image.imageResource,a,s,e,o),n.restore()}return n}())})}console.warn("please set canvasId or canvas!")}QRPolynomial.prototype={get:function(t){return this.num[t]},getLength:function(){return this.num.length},multiply:function(t){for(var e=new Array(this.getLength()+t.getLength()-1),r=0;r<this.getLength();r++)for(var o=0;o<t.getLength();o++)e[r+o]^=QRMath.gexp(QRMath.glog(this.get(r))+QRMath.glog(t.get(o)));return new QRPolynomial(e,0)},mod:function(t){if(this.getLength()-t.getLength()<0)return this;for(var e=QRMath.glog(this.get(0))-QRMath.glog(t.get(0)),r=new Array(this.getLength()),o=0;o<this.getLength();o++)r[o]=this.get(o);for(o=0;o<t.getLength();o++)r[o]^=QRMath.gexp(QRMath.glog(t.get(o))+e);return new QRPolynomial(r,0).mod(t)}},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(t,e){var r=QRRSBlock.getRsBlockTable(t,e);if(void 0==r)throw new Error("bad rs block @ typeNumber:"+t+"/errorCorrectLevel:"+e);for(var o=r.length/3,n=new Array,i=0;i<o;i++)for(var a=r[3*i+0],s=r[3*i+1],u=r[3*i+2],l=0;l<a;l++)n.push(new QRRSBlock(s,u));return n},QRRSBlock.getRsBlockTable=function(t,e){switch(e){case QRErrorCorrectLevel.L:return QRRSBlock.RS_BLOCK_TABLE[4*(t-1)+0];case QRErrorCorrectLevel.M:return QRRSBlock.RS_BLOCK_TABLE[4*(t-1)+1];case QRErrorCorrectLevel.Q:return QRRSBlock.RS_BLOCK_TABLE[4*(t-1)+2];case QRErrorCorrectLevel.H:return QRRSBlock.RS_BLOCK_TABLE[4*(t-1)+3];default:return}},QRBitBuffer.prototype={get:function(t){var e=Math.floor(t/8);return 1==(this.buffer[e]>>>7-t%8&1)},put:function(t,e){for(var r=0;r<e;r++)this.putBit(1==(t>>>e-r-1&1))},getLengthInBits:function(){return this.length},putBit:function(t){var e=Math.floor(this.length/8);this.buffer.length<=e&&this.buffer.push(0),t&&(this.buffer[e]|=128>>>this.length%8),this.length++}};export default drawQrcode;

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【微信小程序使用canvas绘制二维码】

1，在util文件夹中的common.js

2，使用

3，js文件

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