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      首頁 > 網站開發 > JQuery >
      • JavaScript教程之jQuery 遍歷 - 祖先

      • 2017-05-09 21:45 來源:未知

      jQuery 遍歷 - 祖先


      祖先是父、祖父或曾祖父等等。

      通過 jQuery,您能夠向上遍歷 DOM 樹,以查找元素的祖先。


      向上遍歷 DOM 樹

      這些 jQuery 方法很有用,它們用于向上遍歷 DOM 樹:

      • parent()
      • parents()
      • parentsUntil()

      jQuery parent() 方法

      parent() 方法返回被選元素的直接父元素。

      該方法只會向上一級對 DOM 樹進行遍歷。

      下面的例子返回每個 <span> 元素的的直接父元素:

      實例

      $(document).ready(function(){ $("span").parent(); });

      嘗試一下 »


      jQuery parents() 方法

      parents() 方法返回被選元素的所有祖先元素,它一路向上直到文檔的根元素 (<html>)。

      下面的例子返回所有 <span> 元素的所有祖先:

      實例

      $(document).ready(function(){ $("span").parents(); });

      嘗試一下 »

      您也可以使用可選參數來過濾對祖先元素的搜索。

      下面的例子返回所有 <span> 元素的所有祖先,并且它是 <ul> 元素:

      實例

      $(document).ready(function(){ $("span").parents("ul"); });

      嘗試一下 »


      jQuery parentsUntil() 方法

      parentsUntil() 方法返回介于兩個給定元素之間的所有祖先元素。

      下面的例子返回介于 <span> 與 <div> 元素之間的所有祖先元素:

      實例

      $(document).ready(function(){ $("span").parentsUntil("div"); });



      <!DOCTYPE html>
      <html>
      <head>
      <meta charset="utf-8">
      <style>
      .ancestors *
      display: block;
      border: 2px solid lightgrey;
      color: lightgrey;
      padding: 5px;
      margin: 15px;
      }
      </style>
      <script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
      </script>
      <script>
      $(document).ready(function(){
        $("span").parentsUntil("div").css({"color":"red","border":"2px solid red"});
      });
      </script>
      </head>
       
      <body class="ancestors"> body (曾曾祖父元素)
        <div style="width:500px;">div (曾祖父元素)
          <ul>ul (祖父元素)  
            <li>li (父元素)
              <span>span</span>
            </li>
          </ul>   
        </div>
      </body>
       
      </html>

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