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javaScript生成二维码(改造jquery.qrcode.js,使之支持中文,能带logo)
最近公司要求使用javaScript生成二维码,在网上搜了很多相关的资料,都不是很全面,俗话说:自己动手,丰衣足食。
(这里吐槽下,有网友有了解决方案,却刻意把源代码压缩了,导致不知道改了什么东西,知识大家一起学习嘛,授人与鱼不如授人与渔!)
总结如下:
资料搜索
选择star最多的两个
第一个就是用的比较多的jquery.qrcode.js(但不支持中文,不能带logo)啦,第二个支持ie6+,支持中文,根据第二个源代码,使得,jquery.qrcode.js,支持中文。
支持中文
1 //qrcode.js 2 function QR8bitByte(data) { 3 this.mode = QRMode.MODE_8BIT_BYTE; 4 this.data =http://www.mamicode.com/ data; 5 } 6 7 QR8bitByte.prototype = { 8 9 getLength : function(buffer) { 10 return this.data.length; 11 }, 12 13 write : function(buffer) { 14 for (var i = 0; i < this.data.length; i++) { 15 // not JIS ... 16 buffer.put(this.data.charCodeAt(i), 8); 17 } 18 } 19 };
修改如下(就是复制粘贴了第二份代码的头部):
function QR8bitByte(data) { this.mode = QRMode.MODE_8BIT_BYTE; this.data =http://www.mamicode.com/ data; this.parsedData =http://www.mamicode.com/ []; // 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 = http://www.mamicode.com/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); } } };
网上也提供的解决方案:
//在传入文本处转码也可 function utf16to8(str) { var out, i, len, c; out = ""; len = str.length; for(i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007F)) { out += str.charAt(i); } else if (c > 0x07FF) { out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } else { out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } } return out; }
支持自定义logo
- 修改jquery.qrcode.js,createCanvas函数
var createCanvas = function(){ // create the qrcode itself var qrcode = new QRCode(options.typeNumber, options.correctLevel); qrcode.addData(options.text); qrcode.make(); // create canvas element var canvas = document.createElement(‘canvas‘); canvas.width = options.width; canvas.height = options.height; var ctx = canvas.getContext(‘2d‘); //增加以下代码,把图片画出来 if( options.src ) {//传进来的图片地址 //图片大小 options.imgWidth = options.imgWidth || options.width / 4.7; options.imgHeight = options.imgHeight || options.height / 4.7; var img = new Image(); img.src = options.src; //不放在onload里,图片出不来 img.onload = function () { ctx.drawImage(img, (options.width - options.imgWidth) / 2, (options.height - options.imgHeight) / 2, options.imgWidth, options.imgHeight); } } // compute tileW/tileH based on options.width/options.height var tileW = options.width / qrcode.getModuleCount(); var tileH = options.height / qrcode.getModuleCount(); // draw in the canvas for( var row = 0; row < qrcode.getModuleCount(); row++ ){ for( var col = 0; col < qrcode.getModuleCount(); col++ ){ ctx.fillStyle = qrcode.isDark(row, col) ? options.foreground : options.background; var w = (Math.ceil((col+1)*tileW) - Math.floor(col*tileW)); var h = (Math.ceil((row+1)*tileW) - Math.floor(row*tileW)); ctx.fillRect(Math.round(col*tileW),Math.round(row*tileH), w, h); } } // return just built canvas return canvas; };
- 修改jquery.qrcode.js,createTable函数(不支持canvas用table画二维码)
var createTable = function(){ // create the qrcode itself var qrcode = new QRCode(options.typeNumber, options.correctLevel); qrcode.addData(options.text); qrcode.make(); // create table element var $table = $(‘<table></table>‘) .css("width", options.width+"px") .css("height", options.height+"px") .css("border", "0px") .css("border-collapse", "collapse") .css(‘background-color‘, options.background); // compute tileS percentage var tileW = options.width / qrcode.getModuleCount(); var tileH = options.height / qrcode.getModuleCount(); // draw in the table for(var row = 0; row < qrcode.getModuleCount(); row++ ){ var $row = $(‘<tr></tr>‘).css(‘height‘, tileH+"px").appendTo($table); for(var col = 0; col < qrcode.getModuleCount(); col++ ){ $(‘<td></td>‘) .css(‘width‘, tileW+"px") .css(‘background-color‘, qrcode.isDark(row, col) ? options.foreground : options.background) .appendTo($row); } } //主要思想,把table,和img标签放在同一个div下,div relative定位,然后使得图片absolute定位在table中间 if( options.src ) { options.imgWidth = options.imgWidth || options.width / 4.7; options.imgHeight = options.imgHeight || options.height / 4.7; var $img = $(‘<img>‘).attr("src", options.src) .css("width", options.imgWidth) .css("height", options.imgHeight) .css("position", "absolute") .css("left", (options.width - options.imgWidth) / 2) .css("top", (options.height - options.imgHeight) / 2); $table = $(‘<div style="position:relative;"></div>‘) .append($table) .append($img); } // return just built canvas return $table; };
- 对IE做特殊判断,大家懂的
//判断是否IE, IE8以下,用 table,否则用 canvas var isIE = function() { var b = document.createElement(‘b‘); b.innerHTML = ‘<!--[if IE]><i></i><![endif]-->‘; return b.getElementsByTagName(‘i‘).length === 1; }; options.render = options.render || (isIE(6) || isIE(7) || isIE(8))? "table": "canvas";
- 改过后的jquery.qrcode.js如下:
(function( $ ){ $.fn.qrcode = function(options) { // if options is string, if( typeof options === ‘string‘ ){ options = { text: options }; } //判断是否IE, IE8以下,用 table,否则用 canvas var isIE = function() { var b = document.createElement(‘b‘); b.innerHTML = ‘<!--[if IE]><i></i><![endif]-->‘; return b.getElementsByTagName(‘i‘).length === 1; }; options.render = options.render || (isIE(6) || isIE(7) || isIE(8))? "table": "canvas"; // set default values // typeNumber < 1 for automatic calculation options = $.extend( {}, { // render : "canvas", width : 256, height : 256, typeNumber : -1, correctLevel : QRErrorCorrectLevel.H, background : "#ffffff", foreground : "#000000" }, options); var createCanvas = function(){ // create the qrcode itself var qrcode = new QRCode(options.typeNumber, options.correctLevel); qrcode.addData(options.text); qrcode.make(); // create canvas element var canvas = document.createElement(‘canvas‘); canvas.width = options.width; canvas.height = options.height; var ctx = canvas.getContext(‘2d‘); //在中间画logo if( options.src ) { options.imgWidth = options.imgWidth || options.width / 4.7; options.imgHeight = options.imgHeight || options.height / 4.7; var img = new Image(); img.src = options.src; img.onload = function () { ctx.drawImage(img, (options.width - options.imgWidth) / 2, (options.height - options.imgHeight) / 2, options.imgWidth, options.imgHeight); } } // compute tileW/tileH based on options.width/options.height var tileW = options.width / qrcode.getModuleCount(); var tileH = options.height / qrcode.getModuleCount(); // draw in the canvas for( var row = 0; row < qrcode.getModuleCount(); row++ ){ for( var col = 0; col < qrcode.getModuleCount(); col++ ){ ctx.fillStyle = qrcode.isDark(row, col) ? options.foreground : options.background; var w = (Math.ceil((col+1)*tileW) - Math.floor(col*tileW)); var h = (Math.ceil((row+1)*tileW) - Math.floor(row*tileW)); ctx.fillRect(Math.round(col*tileW),Math.round(row*tileH), w, h); } } // return just built canvas return canvas; }; // from Jon-Carlos Rivera (https://github.com/imbcmdth) var createTable = function(){ // create the qrcode itself var qrcode = new QRCode(options.typeNumber, options.correctLevel); qrcode.addData(options.text); qrcode.make(); // create table element var $table = $(‘<table></table>‘) .css("width", options.width+"px") .css("height", options.height+"px") .css("border", "0px") .css("border-collapse", "collapse") .css(‘background-color‘, options.background); // compute tileS percentage var tileW = options.width / qrcode.getModuleCount(); var tileH = options.height / qrcode.getModuleCount(); // draw in the table for(var row = 0; row < qrcode.getModuleCount(); row++ ){ var $row = $(‘<tr></tr>‘).css(‘height‘, tileH+"px").appendTo($table); for(var col = 0; col < qrcode.getModuleCount(); col++ ){ $(‘<td></td>‘) .css(‘width‘, tileW+"px") .css(‘background-color‘, qrcode.isDark(row, col) ? options.foreground : options.background) .appendTo($row); } } //生成logo if( options.src ) { options.imgWidth = options.imgWidth || options.width / 4.7; options.imgHeight = options.imgHeight || options.height / 4.7; var $img = $(‘<img>‘).attr("src", options.src) .css("width", options.imgWidth) .css("height", options.imgHeight) .css("position", "absolute") .css("left", (options.width - options.imgWidth) / 2) .css("top", (options.height - options.imgHeight) / 2); $table = $(‘<div style="position:relative;"></div>‘) .append($table) .append($img); } // return just built canvas return $table; }; return this.each(function(){ var element = options.render == "canvas" ? createCanvas() : createTable(); $(element).appendTo(this); }); }; })( jQuery );
- 测试
jQuery(‘#qrcodeTable‘).qrcode({ render : "table", text : "中文://jetienne.com", src: ‘./logo32.png‘ }); jQuery(‘#qrcodeCanvas‘).qrcode({ text : "中午你://jetienne.com", src: ‘./logo32.png‘ });
javaScript生成二维码(改造jquery.qrcode.js,使之支持中文,能带logo)
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