滚动固定效果

滚动固定效果：

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{ margin:0px auto; padding:0px}
#top{ width:100%; height:200px; background-color:#F03}
#menu{ width:100%; height:50px; background-color:#60F}
.item{ width:200px; height:300px; background-color:#fF0; margin-top:30px; text-align:center; line-height:300px; vertical-align:middle}
</style>
</head>

<body>
<div id="top"></div>
<div id="menu"></div>
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
<div class="item">6</div>
<div class="item">7</div>
<div class="item">8</div>
<div class="item">9</div>
<div class="item">10</div>
<div class="item">11</div>
</body>
<script type="text/javascript">
//添加一个滚动条监听事件
window.onscroll = function(){
    var m = document.getElementById("menu");
    if(window.scrollY>=200){
        m.style.position="fixed";
        m.style.top="0px";     
    }else{
        m.style.position="";
    }
}
</script>
</html>

效果图：

 

 

posted @ 2017-12-27 14:20  桃花灬仙人  阅读(124)  评论(0)  编辑  收藏  举报