jQuery实现下拉菜单滑动效果

当我们制作网页时，有的时候会想拥有一个酷炫且顺滑的下拉菜单，虽然我们使用最基础的css和js也可以完成，但利用jQuery我们只需要非常简短的代码即可完成下面的效果

jQuery实现下拉菜单滑动效果

是不是非常的顺滑呢？鼠标移动到目标上自动的下拉菜单，只需要这样两行代码：

$(" ").hover(function() {
$(this).children(" ").slideToggle();
});

其中，hover是鼠标经过和离开的复合写法，通常会这样写

$(" ").hover(function() {
     $(this).children(" ").slideDown( );
 }, function() {
     $(this).children(" ").slideUp( );
 });

即在hover中写两个函数，一个是鼠标经过的一个是鼠标离开的，两者用逗号隔开，但是可以看到我上面的代码只写了一个函数，这是因为，如果我们只在hover里写一个函数，那么当鼠标经过或离开时都会重复这个效果，这样的写法更加简便。

放在整体代码中这样使用：

<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        li {
            list-style-type: none;
        }
        
        a {
            text-decoration: none;
            font-size:20px;
        }
        
        .nav {
            margin: 100px;
        }
        
        .nav>li {
            position: relative;
            float: left;
            width: 80px;
            height:50px;
            text-align: center;
        }
        
        .nav li a {
            display: block;
            width: 100%;
            height: 100%;
            line-height: 50px;
            color: black;
   border:1px solid skyblue;
        }
        
        .nav>li>a:hover {
            background-color: pink;
        }
        
        .nav ul {
            display: none;
            position: absolute;
            top: 50px;
            left: 0;
            width: 100%;
            border-left: 1px solid #FECC5B;
            border-right: 1px solid #FECC5B;
        }
        
        .nav ul li {
            border-bottom: 1px solid #FECC5B;
        }
        
        .nav ul li a:hover {
            background-color: #FFF5DA;
        }
    </style>
 <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
</head>
 
<body>
    <ul class="nav">
        <li>
            <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  >消息</a>
            <ul>
                <li>
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                </li>
                <li>
                    <a href="" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >评论</a>
                </li>
                <li>
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                </li>
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                    <a href="" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >点赞</a>
                </li>
            </ul>
        </li>
  <li>
      <a href="#" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  >消息</a>
      <ul>
          <li>
              <a href="" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >关注</a>
          </li>
          <li>
              <a href="" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >评论</a>
          </li>
          <li>
              <a href="" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >点赞</a>
          </li>
      </ul>
  </li>
    </ul>
    <script>
        $(function() {
            $(".nav>li").hover(function() {
                $(this).children("ul").slideToggle();
            });
        })
    </script>
</body>
 
</html>

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