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Detailed explanation of jQuery child element selector

小云云Original: 2018-02-09 14:08:052045browse

This article mainly introduces the child element selector of jQuery selector to you in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
  <title></title>
  <link rel="stylesheet" href="imooc.css" rel="external nofollow" type="text/css">
  <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
</head>

<body>
  <h2>子元素筛选选择器</h2>
  <h3>:first-child、:last-child、:only-child</h3>
  <p class="left first-p">
    <p class="p">
      <a>:first-child</a>
      <a>第二个元素</a>
      <a>:last-child</a>
    </p>
    <p class="p">
      <a>:first-child</a>
    </p>
    <p class="p">
      <a>:first-child</a>
      <a>第二个元素</a>
      <a>:last-child</a>
    </p>
  </p>

  <script type="text/javascript">
    //查找class="first-p"下的第一个a元素
    //针对所有父级下的第一个
    $(".first-p a:first-child").css("color", "#CD00CD");
  </script>

  <script type="text/javascript">
    //查找class="first-p"下的最后一个a元素
    //针对所有父级下的最后一个
    //如果只有一个元素的话，last也是第一个元素
    $(".first-p a:last-child").css("color", "red");
  </script>

  <script type="text/javascript">
    //查找class="first-p"下的只有一个子元素的a元素
    $(".first-p a:only-child").css("color", "blue");
  </script>


  <h3>:nth-child、:nth-last-child</h3>
  <p class="left last-p">
    <p class="p">
      <a>:first-child</a>
      <a>第二个元素</a>
      <a>第三个元素</a>
      <a>:last-child</a>
    </p>
    <p class="p">
      <a>:first-child</a>
      <a>第二个元素</a>
    </p>
    <p class="p">
      <a>:first-child</a>
      <a>第二个元素</a>
      <a>第三个元素</a>
      <a>:last-child</a>
    </p>
  </p>

  <script type="text/javascript">
    //查找class="last-p"下的第二个a元素
    $(".last-p a:nth-child(2)").css("color", "#CD00CD");
  </script>

  <script type="text/javascript">
    //查找class="last-p"下的倒数第二个a元素
    $(".last-p a:nth-last-child(2)").css("color", "red");
  </script>

</body>

</html>

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