JQ生成二维码

<img id="code" src="" />

$(function () {
        $('#code').each(function (i) {
            var str = "{:Url('Index/index',['spuid'=>$wechatUser['uid'],'integral'=>'20'],true,true)}";
            //默认使用Canvas生成，并显示到图片
            var qrcode = $(this).qrcode(str).hide();
            var canvas = qrcode.find('canvas').get(0);
            $(this).attr('src', canvas.toDataURL('image/jpg'))
            $(this).show();
        })
    })


    function toUtf8(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;
    }