当视口大于640px的时候,导航条会显示在外,当视口小于768px的时候,导航菜单需要隐藏起来!
代码如下:
<!doctype html> <html> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width"> <title>响应式</title> <link rel="stylesheet" type="text/css" href="demo1.css"/> <link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet"> </head> <body> <p class="nav"> <p class="pic"></p> <p class="btn"> <i id="btn" class="fa fa-bars"></i> </p> <ul id="menu" class="clearfix"> <li><a href="#">首页</a></li> <li><a href="#">产品</a></li> <li><a href="#">购买</a></li> <li><a href="#">服务</a></li> <li><a href="#">联系</a></li> </ul> </p> <script type="text/javascript"> var btn=document.getElementById("btn"); var menu=document.getElementById("menu"); btn.onclick=function(){ if(menu.style.display=="block"){ menu.style.display="none"; } else{ menu.style.display="block"; } window.onresize=function(){ var vw=document.documentElement.clientWidth; if(vw>640){ menu.style.display="block"}; } } </script> </body> </html>
css代码如下:
body{ margin:0; } .nav{ background-color:black; width:100%; position:relative; } .nav ul{ margin:0; padding:0; width:80%; margin:0 auto; } .clearfix:after{ display:block; content:""; height:0; clear:both; visibility:hidden; } .nav ul li{ list-style:none; float:left; } .nav ul li a{ color:white; padding:20px 30px; display:block; text-decoration:none; } .nav ul li a:hover{ background-color:red; } .pic{ background:url(logo.jpg) no-repeat; position:absolute; top:5px; left:5px; width:113px; height:39px; } .btn{ background-color:#333; text-align:right; color:white; font-size:20px; padding:10px; display:none; } @media screen and (max-width:640px){ .nav ul li{ float:none; text-align:center; } .nav ul{ width:100%; } .btn{ display:block; } .pic{ position:absolute; left:50%; margin-left:-56px; } }
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