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How to use jQuery sub-element filter selector

小云云Original: 2018-01-31 13:26:391300browse

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

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Untitled Document</title>
    <link rel="stylesheet" type="text/css" href="css/style.css" rel="external nofollow" >
        <style type="text/css">
      p, span, p {
        width: 140px;
        height: 140px;
        margin: 5px;
        background: #aaa;
        border: #000 1px solid;
        float: left;
        font-size: 17px;
        font-family: Verdana;
      }
      
      p.mini {
        width: 55px;
        height: 55px;
        background-color: #aaa;
        font-size: 12px;
      }
      
      p.hide {
        display: none;
      }      
    </style>
    <script type="text/javascript" src="jquery-1.7.2.js"></script>
    <script type="text/javascript">
      $(document).ready(function(){
        
        $("#btn1").click(function(){
          //选取子元素, 需要在选择器前添加一个空格. 
          $("p.one :nth-child(2)").css("background", "#ffbbaa");
        });
        $("#btn2").click(function(){
          $("p.one :first-child").css("background", "#ffbbaa");
        });
        $("#btn3").click(function(){
          $("p.one :last-child").css("background", "#ffbbaa");
        });
        
        $("#btn4").click(function(){
          $("p.one :only-child").css("background", "#ffbbaa");
        });
        
      });
    </script>
  </head>
  <body>    
    <input type="button" value="选取每个class为one的p父元素下的第2个子元素." id="btn1"/>
    <input type="button" value="选取每个class为one的p父元素下的第一个子元素." id="btn2"/>
    <input type="button" value="选取每个class为one的p父元素下的最后一个子元素." id="btn3"/>
    <input type="button" value="如果class为one的p父元素下的仅仅只有一个子元素，那么选中这个子元素." id="btn4"/>
    
    <br><br>
    <p class="one" id="one">
      id 为 one,class 为 one 的p
      <p class="mini">class为mini</p>
    </p>
    <p class="one" id="two" title="test">
      id为two,class为one,title为test的p
      <p class="mini" title="other">class为mini,title为other</p>
      <p class="mini" title="test">class为mini,title为test</p>
    </p>
    <p class="one">
      <p class="mini">class为mini</p>
      <p class="mini">class为mini</p>
      <p class="mini">class为mini</p>
      <p class="mini"></p>
    </p>
    <p class="one">
      <p class="mini">class为mini</p>
      <p class="mini">class为mini</p>
      <p class="mini">class为mini</p>
      <p class="mini" title="tesst">class为mini,title为tesst</p>
    </p>
    <p style="display:none;" class="none">style的display为"none"的p</p>
    <p class="hide">class为"hide"的p</p>
    <p>
      包含input的type为"hidden"的p<input type="hidden" value="123456789" size="8">
    </p>
    <p id="mover">正在执行动画的p元素.</p>
  </body>
</html>

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jQuery sub-element filter selector detailed explanation

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