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前端生成二维码图片以及条形码图片
阅读量:4323 次
发布时间:2019-06-06

本文共 22326 字,大约阅读时间需要 74 分钟。

  二维码图片既可以由后端生成,同时亦可以前端通过第三方类库来生成

  在 vue 中使用第三方插件 qrcodejs2 生成二维码图片

     1、npm install qrcodejs2  --save-dev

     2、 import QRCode from 'qrcodejs2'

     3、let qrcode = new QRCode(this.$refs.qrcode, { 

               width: 128, 
               height: 128, // 高度  
               text: code, // 二维码内容
               image: '',
                 render: 'canvas' // 设置渲染方式(有两种方式 table和canvas,默认是canvas) 
               // background: '#f0f' 
               // foreground: '#ff0' 
           })

        第三步要在 mounted DOM 实例化之后才可以实现,否则会找不到 DOM 元素而无法渲染;

        使用这个插件的时候需要注意的是, code:二维码的长度不能太长,最大长度是 191 超过 191 就会报错;但是如果过长的话也是可以决绝的,解决的办法参照:https://www.cnblogs.com/Miracle-ZLZ/p/7723857.html

        所以这时候如果是在 vue 项目中的话就不建议使用该方法了,否则就要在 git 上上传修改后的依赖库;或者就是引入修改后的 js 包就可以了,修改后的 js 代码如下底部;

        如果引入 js 包的话只需

          import QRCode from './qrcode.js'

          然后还是在 mounted 中定义 qrcode 或者直接执行 new QRCode() 就可以

 

 

  vue 中也可以进行条形码的转换,这个在网上也提供了很多方式,但是自己试了一下,还是 @xkeshi/vue-barcode  比较好用,其他的总是会报一些错误,最多的就是  Invalid 类的错误

  @xkeshi/vue-barcode 的使用方法:

      1、npm install jsbarcode --save-dev

      2、在 main.js 中引入条形码插件并声明组件

        import VueBarcode from '@xkeshi/vue-barcode'; //导入条形码插件

        Vue.component('barcode', VueBarcode);  //声明条形码组件

      3、在对应的组件中使用组件:

        <barcode value="218268306591" :options="barcode_option" tag="svg" ></barcode>

        并在 data 中生命实例 barcode_option

          例如: barcode_option:{

                       displayValue: true, //是否默认显示条形码数据
                  //textPosition  :'top', //条形码数据显示的位置
                  background: '#fff', //条形码背景颜色
                 valid: function (valid) { },
                 width:'1px',//单个条形码的宽度
                   height: '55px',
                 fontSize: '0px' //字体大小
                }

          其中 value 是将要生成条形码对应的编码,options 是对条形码的设置的一些参数,所有的参数定义如下:           

               format: "CODE39",//选择要使用的条形码类型

               width:3,//设置条之间的宽度

               height:100,//高度

               displayValue:true,//是否在条形码下方显示文字

               text:"456",//覆盖显示的文本

               fontOptions:"bold italic",//使文字加粗体或变斜体

               font:"fantasy",//设置文本的字体

               textAlign:"left",//设置文本的水平对齐方式

               textPosition:"top",//设置文本的垂直位置

               textMargin:5,//设置条形码和文本之间的间距

               fontSize:15,//设置文本的大小

               background:"#eee",//设置条形码的背景

               lineColor:"#2196f3",//设置条和文本的颜色。

               margin:15//设置条形码周围的空白边距

      

/** * @fileoverview * - Using the 'QRCode for Javascript library' * - Fixed dataset of 'QRCode for Javascript library' for support full-spec. * - this library has no dependencies. *  * @author davidshimjs * @see http://www.d-project.com/ * @see http://jeromeetienne.github.com/jquery-qrcode/ */var QRCode;(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    //    //---------------------------------------------------------------------    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);            }        }    };    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
=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
>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
>>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
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
=0)?modPoly.get(modIndex):0;}} var totalCodeCount=0;for(var i=0;i
=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
5){lostPoint+=(3+sameCount-5);}}} for(var row=0;row
=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<
>>(7-index%8))&1)==1;},put:function(num,length){for(var i=0;i
>>(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]]; function _isSupportCanvas() { return typeof CanvasRenderingContext2D != "undefined"; } // android 2.x doesn't support Data-URI spec function _getAndroid() { var android = false; var sAgent = navigator.userAgent; if (/android/i.test(sAgent)) { // android android = true; var aMat = sAgent.toString().match(/android ([0-9]\.[0-9])/i); if (aMat && aMat[1]) { android = parseFloat(aMat[1]); } } return android; } var svgDrawer = (function() { var Drawing = function (el, htOption) { this._el = el; this._htOption = htOption; }; Drawing.prototype.draw = function (oQRCode) { var _htOption = this._htOption; var _el = this._el; var nCount = oQRCode.getModuleCount(); var nWidth = Math.floor(_htOption.width / nCount); var nHeight = Math.floor(_htOption.height / nCount); this.clear(); function makeSVG(tag, attrs) { var el = document.createElementNS('http://www.w3.org/2000/svg', tag); for (var k in attrs) if (attrs.hasOwnProperty(k)) el.setAttribute(k, attrs[k]); return el; } var svg = makeSVG("svg" , {'viewBox': '0 0 ' + String(nCount) + " " + String(nCount), 'width': '100%', 'height': '100%', 'fill': _htOption.colorLight}); svg.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink"); _el.appendChild(svg); svg.appendChild(makeSVG("rect", {"fill": _htOption.colorLight, "width": "100%", "height": "100%"})); svg.appendChild(makeSVG("rect", {"fill": _htOption.colorDark, "width": "1", "height": "1", "id": "template"})); for (var row = 0; row < nCount; row++) { for (var col = 0; col < nCount; col++) { if (oQRCode.isDark(row, col)) { var child = makeSVG("use", {"x": String(col), "y": String(row)}); child.setAttributeNS("http://www.w3.org/1999/xlink", "href", "#template") svg.appendChild(child); } } } }; Drawing.prototype.clear = function () { while (this._el.hasChildNodes()) this._el.removeChild(this._el.lastChild); }; return Drawing; })(); var useSVG = document.documentElement.tagName.toLowerCase() === "svg"; // Drawing in DOM by using Table tag var Drawing = useSVG ? svgDrawer : !_isSupportCanvas() ? (function () { var Drawing = function (el, htOption) { this._el = el; this._htOption = htOption; }; /** * Draw the QRCode * * @param {QRCode} oQRCode */ Drawing.prototype.draw = function (oQRCode) { var _htOption = this._htOption; var _el = this._el; var nCount = oQRCode.getModuleCount(); var nWidth = Math.floor(_htOption.width / nCount); var nHeight = Math.floor(_htOption.height / nCount); var aHTML = ['
']; for (var row = 0; row < nCount; row++) { aHTML.push('
'); for (var col = 0; col < nCount; col++) { aHTML.push('
'); } aHTML.push('
'); } aHTML.push('
'); _el.innerHTML = aHTML.join(''); // Fix the margin values as real size. var elTable = _el.childNodes[0]; var nLeftMarginTable = (_htOption.width - elTable.offsetWidth) / 2; var nTopMarginTable = (_htOption.height - elTable.offsetHeight) / 2; if (nLeftMarginTable > 0 && nTopMarginTable > 0) { elTable.style.margin = nTopMarginTable + "px " + nLeftMarginTable + "px"; } }; /** * Clear the QRCode */ Drawing.prototype.clear = function () { this._el.innerHTML = ''; }; return Drawing; })() : (function () { // Drawing in Canvas function _onMakeImage() { this._elImage.src = this._elCanvas.toDataURL("image/png"); this._elImage.style.display = "block"; this._elCanvas.style.display = "none"; } // Android 2.1 bug workaround // http://code.google.com/p/android/issues/detail?id=5141 if (this._android && this._android <= 2.1) { var factor = 1 / window.devicePixelRatio; var drawImage = CanvasRenderingContext2D.prototype.drawImage; CanvasRenderingContext2D.prototype.drawImage = function (image, sx, sy, sw, sh, dx, dy, dw, dh) { if (("nodeName" in image) && /img/i.test(image.nodeName)) { for (var i = arguments.length - 1; i >= 1; i--) { arguments[i] = arguments[i] * factor; } } else if (typeof dw == "undefined") { arguments[1] *= factor; arguments[2] *= factor; arguments[3] *= factor; arguments[4] *= factor; } drawImage.apply(this, arguments); }; } /** * Check whether the user's browser supports Data URI or not * * @private * @param {Function} fSuccess Occurs if it supports Data URI * @param {Function} fFail Occurs if it doesn't support Data URI */ function _safeSetDataURI(fSuccess, fFail) { var self = this; self._fFail = fFail; self._fSuccess = fSuccess; // Check it just once if (self._bSupportDataURI === null) { var el = document.createElement("img"); var fOnError = function() { self._bSupportDataURI = false; if (self._fFail) { self._fFail.call(self); } }; var fOnSuccess = function() { self._bSupportDataURI = true; if (self._fSuccess) { self._fSuccess.call(self); } }; el.onabort = fOnError; el.onerror = fOnError; el.onload = fOnSuccess; el.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // the Image contains 1px data. return; } else if (self._bSupportDataURI === true && self._fSuccess) { self._fSuccess.call(self); } else if (self._bSupportDataURI === false && self._fFail) { self._fFail.call(self); } }; /** * Drawing QRCode by using canvas * * @constructor * @param {HTMLElement} el * @param {Object} htOption QRCode Options */ var Drawing = function (el, htOption) { this._bIsPainted = false; this._android = _getAndroid(); this._htOption = htOption; this._elCanvas = document.createElement("canvas"); this._elCanvas.width = htOption.width; this._elCanvas.height = htOption.height; el.appendChild(this._elCanvas); this._el = el; this._oContext = this._elCanvas.getContext("2d"); this._bIsPainted = false; this._elImage = document.createElement("img"); this._elImage.alt = "Scan me!"; this._elImage.style.display = "none"; this._el.appendChild(this._elImage); this._bSupportDataURI = null; }; /** * Draw the QRCode * * @param {QRCode} oQRCode */ Drawing.prototype.draw = function (oQRCode) { var _elImage = this._elImage; var _oContext = this._oContext; var _htOption = this._htOption; var nCount = oQRCode.getModuleCount(); var nWidth = _htOption.width / nCount; var nHeight = _htOption.height / nCount; var nRoundedWidth = Math.round(nWidth); var nRoundedHeight = Math.round(nHeight); _elImage.style.display = "none"; this.clear(); 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.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight; _oContext.lineWidth = 1; _oContext.fillStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight; _oContext.fillRect(nLeft, nTop, nWidth, nHeight); // 안티 앨리어싱 방지 처리 _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 ); } } this._bIsPainted = true; }; /** * Make the image from Canvas if the browser supports Data URI. */ Drawing.prototype.makeImage = function () { if (this._bIsPainted) { _safeSetDataURI.call(this, _onMakeImage); } }; /** * Return whether the QRCode is painted or not * * @return {Boolean} */ Drawing.prototype.isPainted = function () { return this._bIsPainted; }; /** * Clear the QRCode */ Drawing.prototype.clear = function () { this._oContext.clearRect(0, 0, this._elCanvas.width, this._elCanvas.height); this._bIsPainted = false; }; /** * @private * @param {Number} nNumber */ Drawing.prototype.round = function (nNumber) { if (!nNumber) { return nNumber; } return Math.floor(nNumber * 1000) / 1000; }; return Drawing; })(); /** * 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); } /** * @class QRCode * @constructor * @example * new QRCode(document.getElementById("test"), "http://jindo.dev.naver.com/collie"); * * @example * var oQRCode = new QRCode("test", { * text : "http://naver.com", * width : 128, * height : 128 * }); * * oQRCode.clear(); // Clear the QRCode. * oQRCode.makeCode("http://map.naver.com"); // Re-create the QRCode. * * @param {HTMLElement|String} el target element or 'id' attribute of element. * @param {Object|String} vOption * @param {String} vOption.text QRCode link data * @param {Number} [vOption.width=256] * @param {Number} [vOption.height=256] * @param {String} [vOption.colorDark="#000000"] * @param {String} [vOption.colorLight="#ffffff"] * @param {QRCode.CorrectLevel} [vOption.correctLevel=QRCode.CorrectLevel.H] [L|M|Q|H] */ QRCode = function (el, 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]; } } if (typeof el == "string") { el = document.getElementById(el); } if (this._htOption.useSVG) { Drawing = svgDrawer; } this._android = _getAndroid(); this._el = el; this._oQRCode = null; this._oDrawing = new Drawing(this._el, this._htOption); if (this._htOption.text) { this.makeCode(this._htOption.text); } }; /** * Make the QRCode * * @param {String} sText link data */ QRCode.prototype.makeCode = function (sText) { this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel); this._oQRCode.addData(sText); this._oQRCode.make(); this._el.title = sText; this._oDrawing.draw(this._oQRCode); this.makeImage(); }; /** * Make the Image from Canvas element * - It occurs automatically * - Android below 3 doesn't support Data-URI spec. * * @private */ QRCode.prototype.makeImage = function () { if (typeof this._oDrawing.makeImage == "function" && (!this._android || this._android >= 3)) { this._oDrawing.makeImage(); } }; /** * Clear the QRCode */ QRCode.prototype.clear = function () { this._oDrawing.clear(); }; /** * @name QRCode.CorrectLevel */ QRCode.CorrectLevel = QRErrorCorrectLevel;})();if (typeof module != "undefined") { module.exports = QRCode;}

 

转载于:https://www.cnblogs.com/mufc/p/11163424.html

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