jquery implements secondary navigation drop-down menu effect_jquery

The implementation of the drop-down menu is very simple, and it can also be implemented with pure CSS, but I am not good at it. It only takes two lines of code to use jquery, so I use jquery+css to implement a simple secondary drop-down menu navigation. I will share it with you for your reference. The content is as follows

Operation rendering:

Specific code:
Step one: Determine the html format of the navigation

<ul id="nav"> 
        <li><a href="#">首页</a> 
          <ul> 
            <li><a href="#">PHP编程</a></li> 
            <li><a href="#">JAVA编程</a></li> 
            <li><a href="#">RGB对照表</a></li> 
            <li><a href="#">颜色搭配技巧</a></li> 
          </ul> 
        </li> 
        <li><a href="#">栏目一</a> 
          <ul> 
            <li><a href="#">PHP编程</a></li> 
            <li><a href="#">JAVA编程</a></li> 
            <li><a href="#">RGB对照表</a></li> 
            <li><a href="#">颜色搭配技巧</a></li> 
          </ul> 
        </li> 
<ul>

Step 2: CSS to achieve navigation effect 

 #nav { 
        line-height: 24px; list-style-type: none; background:#666; 
      } 
      #nav a { 
        display: block; width: 100px; text-align:center; 
      } 
      #nav a:link { 
        color:#666; text-decoration:none; 
      } 
      #nav a:visited { 
        color:#666;text-decoration:none; 
      } 
      #nav a:hover { 
        color:#FFF;text-decoration:none;font-weight:bold; 
      } 
      #nav li { 
        float: left; width: 100px; background:#CCC; 
      } 
      #nav li a:hover{ 
        background:#999; 
      } 
      #nav li ul { 
        line-height: 27px; list-style-type: none;text-align:left; width: 180px; position: absolute;display: none;
      } 
      #nav li ul li{ 
        float: left; width: 180px; 
        background: #F6F6F6; 
      } 
      #nav li ul a{ 
        display: block; width: 156px;text-align:left;padding-left:24px; 
      } 
      #nav li ul a:link { 
        color:#666; text-decoration:none; 
      } 
      #nav li ul a:visited { 
        color:#666;text-decoration:none; 
      } 
      #nav li ul a:hover { 
        color:#F3F3F3;text-decoration:none;font-weight:normal; 
      } 

Step 3: jquery to implement drop-down hiding effect

  $(function() {
        $("#nav li").hover(
            function() {
              $(this).find("ul").show(100);
            },
            function() {
              $(this).find("ul").hide(300);
            }
        );
      });

I hope this article will be helpful for everyone to learn javascript programming and teach you how to achieve the secondary navigation drop-down menu effect through jquery.