Does jquery object have size() method?

<p>Does the method of jQuery object have size?

<p>jQuery is a very popular JavaScript framework. It not only provides a rich JavaScript function library, but also includes a set of powerful selectors and a set of APIs that provide operations and processing for HTML DOM. When using jQuery, we often use jQuery objects, which are collections of elements selected using jQuery selectors. Well, in this process, using jQuery objects often requires calling various methods. Among them, size() is a method of the jQuery object.

<p>In jQuery, the size() method is used to get the number of currently selected elements. It is a function of the jQuery object that returns a numeric value representing the number of elements in the selected collection of elements. The following is an example:

var len = $("p").size();  //获取页面中所有<p>元素的数量

<p>This statement will return the number of all <p> elements in the current page, and this number will be stored in the variable len. The size() method can also be used in conjunction with other jQuery methods to filter the required elements and obtain the corresponding quantity. For example:

var len2 = $("li.item").size();   //获取class为item的li元素的数量

<p>In this example, the size() method will only count the number of

elements with class item.

<p>It should be noted that in the latest jQuery version, although the size() method is still supported, it is recommended to use the length attribute instead. In fact, the length attribute and the size() method have the same function, both return the number of elements in the selected element collection. However, using the length property is not only cleaner, but also slightly more efficient because it doesn't require calling an extra function to get the data. Therefore, for novices, it is recommended to use the length attribute, and for veterans, the size() method is also available.

<p>In short, whether you use the size() method or the length attribute, understanding their functions and usage is beneficial to learning and using jQuery. In practice, we recommend that you always use the latest jQuery version to ensure that your code is always consistent with the latest technologies and best practices.

The above is the detailed content of Does jquery object have size() method?. For more information, please follow other related articles on the PHP Chinese website!