jquery实现顶部浮动效果

时间：2021-06-16 10:06:37

示例：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
    <title>test page</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="css/main.css" />
    <script src="./jquery.js"></script>
</head>
<body>
<div class="top"></div>
<div class="wrap">
    <div class="tip">浮起来吧</div>
    <div class="xia">mmmmmmmmmmmmmmmmmmbbbbbbbbbbbbbbbbbbbbbbb</div>
    
        1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
        1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
        1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
        1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>1<br>
</div>
<script type="text/javascript">
    $(function(){
        var stiptop = $(".tip").position().top;
        var sNum = 210;
        $(window).scroll(function(){
            var sTop = parseInt($(window).scrollTop());
            if(sTop > 210){
                 $(".tip").css({'position':'fixed','marginTop':'0px'});
            }
            else{
                $(".tip").css({'position':'static','marginTop':'10px'});
            }
        });
    });
</script>
</body>
</html>

 

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