var qrCheck = {
    getQuery: function(name) {
        var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)');
        var r = window.location.search.substr(1).match(reg);

        if (r !== null) {
            return unescape(r[2]);
        }
        return null;
    },

    init: function() {
        var qr = this.getQuery('qr');

        if (qr) {
            location.href = 'http://union.yoho.cn/union/app-downloads.html';
        }
    }
};

qrCheck.init();