js判断鼠标向上滚动，显示出来,向下隐藏 转载

判断鼠js判断鼠标向上滚动，显示出来,向下隐藏

复制html<div id="Jnav">
	<ul class="nav">
		<li><a href="http://caibaojian.com/">WEB前端开发</a></li>
		<li><a href="#">前端开发博客</a></li>
		<li><a href="#">前端开发</a></li>
		<li><a href="#">前端开发</a></li>
	</ul>
</div>
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复制css/*****判断鼠标向上滚动，显示出来,向下隐藏****/
.fixed-nav{
	position: fixed;
	width:100%;
	top:-55px;
	-webkit-transition: top .5s;
	-moz-transition: top .5s;
	-o-transition: top .5s;
	transition: top .5s;
	-webkit-box-shadow: 0 2px 2px rgba(0,0,0,.1);
	-moz-box-shadow: 0 2px 2px rgba(0,0,0,.1);
	box-shadow: 0 2px 2px rgba(0,0,0,.1);
}
.fixed-nav-appear{top:0;}
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复制java/**
 * 判断鼠标向上滚动，显示出来,向下隐藏
 * 代码来自 http://caibaojian.com/scroll-fix-nav.html
 */
var $nav = $('#navbar'), navTop = $nav.offset().top, navH = $nav.outerHeight(),winTop_1=0,winWidth=$(window).width(), holder=jQuery('<div>');
$(window).on('scroll',function(){
	var winTop_2 = $(window).scrollTop();
	holder.css('height',navH);
	var height = 20;
	//开始浮动，不过不显示
	if(winTop_2>navTop && winWidth>height){
		holder.show().insertBefore($nav);
		$nav.addClass('fixed-nav');
	}else{
		holder.hide();
		$nav.removeClass('fixed-nav');
	}
	//判断鼠标向上滚动，显示出来
	if(winTop_2>winTop_1 && winWidth>height){
		$nav.removeClass('fixed-nav-appear');
	}else if(winTop_2<winTop_1){
		$nav.addClass('fixed-nav-appear');
	}
	winTop_1 = $(window).scrollTop();
});
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原文链接：http://caibaojian.com/scroll-fix-nav.html