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Html ceiling effect, html ceiling

Source: Internet
Author: User
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Html ceiling effect, html ceiling
I. HTML

In HTML, you need to give the div an id

<body><div id="head"></div></body>
Ii. CSS 
<style>  #head {      background-color: #989898;      width: 100%;      height: 100px;      margin-top: 100px;  }  #head [data-fixed="fixed"]{      position: fixed;      top:0;      left: 0;      margin: 0;   }
 </style>
3. JS1 and process-oriented 
<script>    var obj = document.getElementById("head");    var ot = obj.offsetTop;    document.onscroll = function () {    var st = document.body.scrollTop || document.documentElement.scrollTop;    obj.setAttribute("data-fixed",st >= ot?"fixed":"")}</script>
2. Object-oriented 1) Encapsulation Method 
/** Encapsulate the ceiling function, which must be implemented in combination with css. * You can also use js to change the style and modify it on your own. */Function ceiling (obj) {var ot = obj. offsetTop; document. onscroll = function () {var st = document. body. scrollTop | document.doc umentElement. scrollTop; obj. setAttribute ("data-fixed", st> = ot? "Fixed ":"");}}
2) Call Method 
<Script src = "ceiling. js "> </script> <script> window. onload = function () {/* Get object */var wrap = document. getElementById ("head"); ceiling (wrap)/* call the ceiling function */}; </script>

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Related Keywords:
upper ceiling ceiling function ceiling return ceiling x ceiling operation ceiling value round ceiling

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