//尾部导航栏更多页面内的时间。
var t = null;
t = setTimeout(time, 1000);
function time(){
	clearTimeout(t);
	dt = new Date();
	var y = dt.getYear() + 1900;
	var mm = dt.getMonth() + 1;
	var d = dt.getDate();
	var weekday = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
	var day = dt.getDay();
	var h = dt.getHours();
	var m = dt.getMinutes();
	var s = dt.getSeconds();
	if (h < 10) {
		h = "0" + h;
	}
	if (m < 10) {
		m = "0" + m;
	}
	if (s < 10) {
		s = "0" + s;
	}
	document.getElementById("time_date").innerHTML = y + "年" + mm + "月" + d + "日";
	document.getElementById("time_w").innerHTML = weekday[day];
	document.getElementById("time_hm").innerHTML = h + ":" + m;
	document.getElementById("time_s").innerHTML = s;
	t = setTimeout(time, 1000);        
}


//如果需要尾部导航栏固定，把下面代码全部删除即可。
var new1_scroll_position = 0;
var last1_scroll_position;
var footer = document.getElementById("footer_nav");
window.addEventListener('scroll', function(e) {
  last1_scroll_position = window.scrollY;
 
  // 向下滚动
  if (new1_scroll_position < last1_scroll_position && last1_scroll_position > 2) {
    footer.classList.remove("slideDown");
    footer.classList.add("slideUp1");
 
  // 向上滚动
  } else if (new1_scroll_position > last1_scroll_position) {
    footer.classList.remove("slideUp1");
    footer.classList.add("slideDown");
  }
 
  new1_scroll_position = last1_scroll_position;
});