js相关小实例——滚动监听 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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}
</style>
</head>

<body>

<div style="width:100%; height:100px; background-color:#63F"></div>
<div id="menu" style="width:100%; height:50px; background-color:#F36;"></div>

<input type="button" value="滚动" onclick="gun()" />

<div style="width:100%; height:1000px; background-color:#FF6"></div>

</body>
<script type="text/javascript">

window.onscroll = function(){
        var d = document.getElementById("menu");
        if(window.scrollY >= 100)
        {
            d.style.position = "fixed";
            d.style.top = "0px";
            
        }
        else
        {
            d.style.position = "relative";
        }
        
        
    }
    
    function gun()
    {
        window.scrollTo(0,100);
    }

</script>
</html>

点击滚动按钮后

 

posted @ 2017-03-11 13:44  彬彬有礼☆  阅读(133)  评论(0)  编辑  收藏  举报