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
//qrcode.js function QR8bitByte(data) { this.mode = QRMode.MODE_8BIT_BYTE; this.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); } } };
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 = 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); } } };
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 = $('<div></div>') .append($table) .append($img); } // return just built canvas return $table; };
对IE做特殊判断，大家懂的