window.onscroll = debounce(scrollFn, 200);
//防抖
function debounce(fn, delay){
	let timeout;
	return function() {
		clearTimeout(timeout);
		timeout = setTimeout(()=>{
			fn.apply(this, arguments);
		},delay)
	}
}
function scrollFn(){
	//获取网页的总高度
	var htmlHeight = document.body.scrollHeight || document.documentElement.scrollHeight;
	//clientHeight是网页在浏览器中的可视高度
	var clientHeight = document.body.clientHeight || document.documentElement.clientHeight;
	//scrollTop是浏览器滚动条的top位置
	var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
	//判断到底部了
	if (scrollTop + clientHeight > htmlHeight - 50) {
		$this = $('.loadmore');
		$this.css('box-shadow','unset').text('正在加载，请稍后。。。');
		var href = $this.attr('data-url');
		if (href != undefined) {
			$.ajax({
				url: href,
				type: 'get',
				error: function(request) {
					console.log(request);
					$this.css('box-shadow','#F56C6C 0px 0px 4px').text('加载失败');
				},
				success: function(data) {
					$this.css('box-shadow','unset').text('加载更多');
					var curpage=$('.pagination').find('.active').find('.page-link').text();
					curpage++;
					$('.pagination').find('.active').removeClass('active');
					$('.pagination li').each(function(){
						if($(this).text() ==curpage) {$(this).addClass('active');}
					});
					var $res = $(data).find('.threadItem');
					$('.threadlist').append($res.fadeIn(500));
					var newhref = $(data).find('.nextpage').attr('data-url');
					if (newhref != undefined) {
						$('.loadmore').attr('data-url', newhref);
					} else {
						$('.loadmore').remove();
						curpage--;
						$('.pagination li').each(function(){
						if($(this).text() ==curpage) {$(this).addClass('active');}
						});
					}
				}
			});
		}
	}
}