JS、CSS實現HTML自適應網頁頂部top導航樣式示例

JS、CSS實現HTML自適應網頁頂部top導航樣式示例

HTML：

<div class="topnav" id="myTopnav">
  <a href="#home">首頁</a>
  <a href="#news">產品</a>
  <a href="#news">新聞</a>
  <a href="#contact">聯繫方式</a>
  <a href="#about">關於我們</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" οnclick="myFunction()">&#9776;</a>
</div>
<div style="padding-left:16px">
  <h2>js、css 響應式導航實例</h2>
  <p>瀏覽器打開，改變此網頁全屏狀態查看效果</p>
</div>

css：

body {margin:0;}

.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }

}

js：

function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
    } else {
        x.className = "topnav";
    }
}