let flag = false
$('.menu img').click(function (e) {
    flag = !flag
    $(this).prop('src', flag ? '/images/close-bold.png' : '/images/menu.png');
    $(this).fadeIn();
    if (flag) {
        $('.navbar').slideDown();
    } else {
        $('.navbar').slideUp();
    }
})

(function(){
    var bp = document.createElement('script');
    var curProtocol = window.location.protocol.split(':')[0];
    if (curProtocol === 'https') {
        bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';        
    }
    else {
        bp.src = 'http://push.zhanzhang.baidu.com/push.js';
    }
    var s = document.getElementsByTagName("script")[0];
    s.parentNode.insertBefore(bp, s);
})();