用jQuery使页面滚动页头/导航消失，页面滚动动画效果

HTML代码

 

<div class="top-title ">这是顶部导航条</div>
<div class="margin"><p>滚动看效果</p><p>滚动看效果</p></div>

 

　　

 CSS代码

 

<style type = css/text>
   .top-title {background:#e74c3c;color:white;font-size:24px;padding:5px;text-align:center;position: fixed;left:0;top:0;width:100%;transition: top 2s;} 
   /*top-title中定义了transition: top .5s;是指.5S时间内动画展示top方向数值的改为。如添加hidden类后，top-title会在0.5s内从top的0动画缓冲到-90PX。*/ 
   .hiddened{top: -90px;}
   .showed{top:0;z-index: 9999;} 
   .margin{height:1000px;width:100%;background-color:rgba(99,227,85,0.5)}
    /*先设定好粉色和黄色的轮换*/ 
   .pink{background-color:rgba(225,119,146,1.00); } 
   .yellow{background-color:rgba(239,233,74,1.00);}
</style>

 

　　

 

JS代码　　

//毋庸置疑先引进jQuery
<script src="jquery-1.11.3.js"></script>
<script >
 $(function(){
     var winHeight = $(document).scrollTop();
     $(window).scroll(function(){
          var scrollY = $(window).scrollTop();
           if(scrollY >330){
                 $('.top-title').addClass('hiddened');
                 $('.margin').addClass('yellow')
            }else {
                $('.top-title').removeClass("hiddened");
                $('.margin').removeClass('yellow');
           }
           if(scrollY > winHeight){
                $('.top-title').removeClass('showed');
                $('.margin').removeClass('pink');
                //alert($(document).height())
           }else{
               $('.top-title').addClass('showed');
               $('.margin').addClass('pink');
          }
    console.log(scrollY);//可以实施观察鼠标滚轮的位置
    });
});

</script>