目录

如何 - 全屏覆盖导航


了解如何创建全屏覆盖导航菜单。


单击下面的按钮查看其工作原理:

亲自试一试 »

创建全屏覆盖导航

步骤1)添加HTML:

示例

<!-- The overlay -->
<div id="myNav" class="overlay">

  <!-- Button to close the overlay navigation -->
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>

  <!-- Overlay content -->
  <div class="overlay-content">
    <a href="#">About</a>
    <a href="#">Services</a>
    <a href="#">Clients</a>
    <a href="#">Contact</a>
  </div>

</div>

<!-- Use any element to open/show the overlay navigation menu -->
<span onclick="openNav()">open</span>

步骤2)添加CSS:

示例

/* The Overlay (background) */
.overlay {
  /* Height & width depends on how you want to reveal the overlay (see JS below) */   
  height: 100%;
  width: 0;
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  left: 0;
  top: 0;
  background-color: rgb(0,0,0); /* Black fallback color */
  background-color: rgba(0,0,0, 0.9); /* Black w/opacity */
  overflow-x: hidden; /* Disable horizontal scroll */
  transition: 0.5s; /* 0.5 second transition effect to slide in or slide down the overlay (height or width, depending on reveal) */
}

/* Position the content inside the overlay */
.overlay-content {
  position: relative;
  top: 25%; /* 25% from the top */
  width: 100%; /* 100% width */
  text-align: center; /* Centered text/links */
  margin-top: 30px; /* 30px top margin to avoid conflict with the close button on smaller screens */
}

/* The navigation links inside the overlay */
.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #818181;
  display: block; /* Display block instead of inline */
  transition: 0.3s; /* Transition effects on hover (color) */
}

/* When you mouse over the navigation links, change their color */
.overlay a:hover, .overlay a:focus {
  color: #f1f1f1;
}

/* Position the close button (top right corner) */
.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

/* When the height of the screen is less than 450 pixels, change the font-size of the links and position the close button again, so they don't overlap */
@media screen and (max-height: 450px) {
  .overlay a {font-size: 20px}
  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
}


步骤 3) 添加 JavaScript:

下面的示例在触发时从左到右(0 到 100% 宽度)在覆盖导航菜单中滑动:

从侧面滑入

/* Open when someone clicks on the span element */
function openNav() {
  document.getElementById("myNav").style.width = "100%";
}

/* Close when someone clicks on the "x" symbol inside the overlay */
function closeNav() {
  document.getElementById("myNav").style.width = "0%";
}
亲自试一试 »

下面的示例在覆盖导航菜单中从顶部向下滑动(0 到 100% 高度)。

笔记:在此示例中,请注意 CSS 与上面的略有不同(默认高度现在为 0,宽度为 100%,overflow-y 被隐藏(禁用垂直滚动,小屏幕除外)):

从顶部滑下来

/* Open */
function openNav() {
  document.getElementById("myNav").style.height = "100%";
}

/* Close */
function closeNav() {
  document.getElementById("myNav").style.height = "0%";
}
亲自试一试 »

此示例打开不带动画的导航菜单:

打开菜单没有动画

/* Open */
function openNav() {
  document.getElementById("myNav").style.display = "block";
}

/* Close */
function closeNav() {
  document.getElementById("myNav").style.display = "none";
}
亲自试一试 »

提示:去我们的CSS 导航栏教程了解有关导航栏的更多信息。

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