变形特效固定导航菜单

PetitQ 导航菜单 2018-10-20 1.85K 0 0

这是一款 jQuery 和 CSS3 带变形特效的固定导航菜单。该导航菜单开始时固定在页面左上角，当用户向下滚动时，导航菜单以水滴变形的方式转换为圆形菜单，然后固定在页面的左上角位置。

HTML 结构：

该导航菜单的主菜单 HTML 结构如下：

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```
<nav>
```
```
  <div id="drop">
```
```
    <div>
```
```
      <span></span>
```
```
      <span></span>
```
```
      <span></span>
```
```
    </div>
```
```
  </div>
```
```
</nav>
```

然后创建全屏导航菜单。

```
<ul>
```
```
  <li>Home</li>
```
```
  <li>Portfolio</li>
```
```
  <li>Jobs</li>
```
```
  <li>Contact</li>
```
```
  <li>About</li>
```
```
</ul>
```
```
CSS样式
```
```
 
```

为导航菜单添加下面的CSS样式。

#drop, nav { background-color: #f8f8f8 }

```
 
```
```
nav {
```
```
  width: 90%;
```
```
  height: 90px;
```
```
  padding: 0 5%;
```
```
  position: relative;
```
```
  justify-content: flex-start;
```
```
  align-items: center
```
```
}
```
```
 
```
```
nav~ul {
```
```
  position: absolute;
```
```
  flex-direction: column;
```
```
  justify-content: center;
```
```
  align-items: center;
```
```
  left: 1%;
```
```
  right: 1%;
```
```
  opacity: 0;
```
```
  visibility: hidden;
```
```
  z-index: 2;
```
```
  list-style: none;
```
```
  transition: 0s
```
```
}
```
```
 
```
```
nav~ul>li {
```
```
  color: #70f;
```
```
  padding: 10px;
```
```
  cursor: pointer;
```
```
  font-size: 30px
```
```
}
```
```
 
```

nav~ul>li:hover { filter: brightness(200%) }

```
 
```
```
nav.open~ul {
```
```
  transition: .75s ease-in-out;
```
```
  visibility: visible;
```
```
  opacity: 1
```
```
}
```
```
 
```
```
#drop {
```
```
  cursor: pointer;
```
```
  position: fixed;
```
```
  width: 70px;
```
```
  height: 70px;
```
```
  border-radius: 0 50% 50%;
```
```
  transform: rotate(45deg);
```
```
  transition: border-radius .5s
```
```
}
```
```
 
```
```
nav.open>#drop {
```
```
  transition: .5s ease-in-out;
```

  box-shadow: 0 0 0 1000px #f8f8f8, inset 0 0 0 20px #f8f8f8;

```
  position: relative
```
```
}
```
```
 
```
```
#drop.active {
```
```
  border-radius: 50%;
```
```
  animation: drop .3s forwards
```
```
}
```
```
 
```
```
#drop>div {
```
```
  transform: rotate(-45deg);
```
```
  height: 100%;
```
```
  width: 100%;
```
```
  flex-direction: column;
```
```
  justify-content: center;
```
```
  align-items: center
```
```
}
```
```
 
```
```
#drop span {
```
```
  display: block;
```
```
  background-color: #70f;
```
```
  width: 40px;
```
```
  height: 3px;
```
```
  margin: 5px 0;
```
```
  transition: .5s
```
```
}
```
```
 
```

#drop span.open:nth-child(1) { transform: rotate(45deg) translate(5px, 5px) }

```
 
```

#drop span.open:nth-child(2) { transform: rotate(-45deg) translate(5px, -5px) }

```
 
```

#drop span.open:nth-child(3) { opacity: 0 }

```
 
```
```
@keyframes 
```
```
drop { 0% {
```
```
transform:translateY(0) rotate(45deg)
```
```
}
```
```
50% {
```

transform:translateY(30px) rotate(45deg)

```
}
```
```
100% {
```

transform:translateY(10px) rotate(45deg)

```
}
```
```
}
```

初始化插件：

在页面 DOM 元素加载完毕之后，通过下面的方法来完成页面向下滚动时菜单的变形效果。

```
$(window).scroll(function() {
```
```
  var scroll = $(window).scrollTop();
```

  if (scroll > 100) $('#drop').addClass('active');

  else if (scroll < 80) $('#drop').removeClass('active');

```
});
```

通过下面的代码来激活全屏菜单。

$('#drop, nav ~ ul li').click(function() {

  $('nav, #drop span').toggleClass('open');

```
  $('body').toggleClass('hidden');
```
```
  $(window).scrollTop(0);
```
```
});
```

该 jQuery 和 CSS3 带变形特效的固定导航菜单的 github 地址为：https://github.com/nodediggity/menu-droplet-animation

变形特效固定导航菜单

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