.odd()

所属分类：Traversing > Filtering 英文文档：.odd()

.odd()Returns: jQuery

Description: Reduce the set of matched elements to the odd ones in the set, numbered from zero.

  • version added: 3.5.odd()

    • This method does not accept any arguments.

Given a jQuery object that represents a set of DOM elements, the .odd() method constructs a new jQuery object from the odd elements in that set. Counting starts from zero!

Consider a page with a simple list on it:

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<ul>
  <li>list item 1</li>
  <li>list item 2</li>
  <li>list item 3</li>
  <li>list item 4</li>
  <li>list item 5</li>
</ul>

We can apply this method to the set of list items:

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$( "li" ).odd().css( "background-color", "red" );

The result of this call is a red background for the second & 4th items.

Example:

Highlight the odd items in a list.

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>odd demo</title>
  <style>
  .highlight {
    background-color: yellow;
  }
  </style>
  <script src="https://code.jquery.com/jquery-3.7.1.js"></script>
</head>
<body>
 
<ul>
  <li>Look:</li>
  <li>This is some text in a list.</li>
  <li>This is a note about it.</li>
  <li>This is another note about it.</li>
</ul>
 
<script>
$( "ul li" ).odd().addClass( "highlight" );
</script>
 
</body>
</html>

Demo: