Highlight case

case analysis:

Mouse over each li, li through which comes on (low transparency), others are dimmed li siblings, all the brothers themselves are not included

Mouse leaves wrap, all will brighten li

Key Code:

$(function(){
   $(".wrap > ul > li ").mouseenter(function() { 
      $(this).css("opacity" , "1") . siblings().css( "opacity" , "0.4");
   )
   $(".wrap"). mouseleave(function(){
      $(this).find(" li ").css("opacity" , "1");
      也可以写成 $(this).children().children()

   })
})

Complete code:

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
    * {
      margin: 0;
      padding: 0;
    }
    
    ul {
      list-style: none;
    }
    
    body {
      background: #000;
    }
    
    .wrap {
      margin: 100px auto 0;
      width: 630px;
      height: 394px;
      padding: 10px 0 0 10px;
      background: #000;
      overflow: hidden;
      border: 1px solid #fff;
    }
    
    .wrap li {
      float: left;
      margin: 0 10px 10px 0;
      
    }
    
    .wrap img {
      display: block;
      border: 0;
    }
  </style>
  
  <script src="jquery-1.12.4.min.js"></script>
  <script>
    $(function () {
      
      $(".wrap>ul>li").mouseenter(function () {
        
        $(this).css("opacity", "1").siblings().css("opacity", "0.4");
      });
      
      $(".wrap").mouseleave(function () {
        //让所有的li都变亮
        //$("li");
        //$(".wrap li");
        //$(".wrap>ul>li")
        
        //$(this).children().children("li");
        $(this).find ( 'on').css("opacity", 1);
      });
    });
  </script>
  
</head>
<body>
<div class="wrap">
  <ul>
    <li><a href="#"><img src="images/01.jpg" alt=""/></a></li>
    <li><a href="#"><img src="images/02.jpg" alt=""/></a></li>
    <li><a href="#"><img src="images/05.jpg" alt=""/></a></li>
    <li><a href="#"><img src="images/06.jpg" alt=""/></a></li>
    <li><a href="#"><img src="images/05.jpg" alt=""/></a></li>
    <li><a href="#"><img src="images/06.jpg" alt=""/></a></li>
  </ul>
</div>
</body>
</html>

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