public/plugins/jquery/jquery-qrcode/src/jquery.qrcode.js

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(function ($) {
    $.fn.qrcode = function (options) {
        // if options is string, 
        if (typeof options === 'string') {
            options = { text: options };
        }

        // set default values
        // typeNumber < 1 for automatic calculation
        options = $.extend({}, {
            render: "canvas",
            width: 256,
            height: 256,
            typeNumber: -1,
            correctLevel: QRErrorCorrectLevel.H,
            margin: 10,
            strokeStyle: '#666', //边框线条颜色
            fillStyle: '#fff', //圆角矩形填充颜色
            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');

            // compute tileW/tileH based on options.width/options.height
            var tileW = (options.width - (options.margin * 2)) / qrcode.getModuleCount();
            var tileH = (options.height - (options.margin * 2)) / qrcode.getModuleCount();

            ctx.fillStyle = options.background || '#fff';
            ctx.fillRect(0, 0, options.width, options.height); //先刷上背景

            // 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 + options.margin), Math.round(row * tileH + options.margin), w, h);
                }
            }

            //增加以下代码，把图片画出来
            if (options.imgsrc) {//传进来的图片地址

                var maxImgW = (options.width - (options.margin * 2)) * 0.45,
                    maxImgH = (options.height - (options.margin * 2)) * 0.33;

                //图片大小
                options.imgWidth = options.imgWidth || options.width / 4.7;
                options.imgHeight = options.imgHeight || options.height / 4.7;