$(function () {


            var str = window.location.href;


            jQuery('#qrcode').qrcode({


                render: "table", //也可以替换为table


                text: str


            });


            $('.scan').hover(function () {


                $('#qrcode').show();


            }, function () {


                $('#qrcode').hide();


            });


        });


        function toUtf8(str) {


            var out, i, len, c;


            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;


        }