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固定导航栏
浅若夏沫
Original
531 people have browsed it
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>固定导航栏</title>
  8.     <style>
  9.         *{
  10.             margin:0;
  11.             padding:0;
  12.         }
  13.         #one{
  14.             background:goldenrod;
  15.             height:100px;
  16.             width:500px;
  17.            font-size:20px;
  18.         }
  19.         #two{
  20.             background:rgb(109, 240, 245);
  21.             height:500px;
  22.             width:500px;
  23.             font-size:20px;
  24.         }
  25.         #three{
  26.             background:rgb(247, 157, 194);
  27.             height:500px;
  28.             width:500px;
  29.             font-size:20px;
  30.         }
  31.     </style>
  32. </head>
  33. <body>
  34.     <div id="one">这是顶部</div>
  35.     <div id="two">这是中间</div>
  36.     <div id="three">这是尾部</div>
  38.     <script>
  40.      window.onload = function() {
  41.          var one = document.getElementById('one');
  42.          var two = document.getElementById('two');
  43.          var three = document.getElementById('three');
  46.      window.onscroll=function(){
  47.         if(document.documentElement.scrollTop >= one.offsetHeight ){
  48.                     one.style.cssText="position:fixed;top:0px;";
  49.                     two.style.marginTop = one.offsetHeight+"px";
  51.                 }else {
  52.                     one.style.cssText="position:static;";
  53.                     two.style.marginTop ='0px';
  55.                 }
  56.             }
  57.      }    
  60.     </script>
  61. </body>
  62. </html>

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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