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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ~~~ <style> * { margin: 0; padding: 0; } body { height: 2000px; } .nav { background-color: aqua; padding: 0 10%; transition: all 1s; } .nav ul { list-style: none; overflow: hidden; } .nav li { float: left; margin-right: 30px; } .nav a { line-height: 100px; } .fixed { position: fixed; width: 100%; background: cadetblue; } .fixed a { color: #fff !important; } </style> </head> <body> <div class="nav" id="nav"> <ul> <li><a>HOME</a></li> <li><a>ABOUT</a></li> <li><a>HOBBY</a></li> <li><a>CONTACT</a></li> </ul> </div> <script> window.onload = function(){ var nav = document.getElementById("nav"); document.onscroll = function(){ var sTop = document.documentElement.scrollTop; if(sTop>0){ nav.className = "nav fixed"; }else { nav.className = "nav"; } } } </script> </body> ~~~ ![](https://box.kancloud.cn/7fe09f2d64e0e88587ee405043ccc3f2_505x379.gif)
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                              哎呀哎呀视频在线观看