arch-bg").css("background-image", "url(\/assets\/images\/background.png)");
        document.body.classList.remove('io-grey-mode');
        document.body.classList.add('io-black-mode');
        document.cookie = "night=1;path=/"
        console.log(' ');
        $(".switch-dark-mode").attr("data-original-title","日间模式");
        $(".mode-ico").removeClass("icon-night");
        $(".mode-ico").addClass("icon-light");
    }else{
	$("#search-bg").css("background-image", "url(\/assets\/images\/background