jquery last element?

JavaScript is a very powerful programming language that can be used for front-end and back-end development to implement various complex functions and logic. In front-end development, JavaScript is an indispensable part. As a very popular JavaScript library, jQuery provides convenience to developers and greatly simplifies the work of front-end development.

There is a method .prev() in the jQuery documentation, which is used to obtain the previous sibling element of the target element, but this method has a more special usage, namely . prev(selector), used to obtain the sibling elements matching the selector in front of the target element.

The following is an example that demonstrates how to use jQuery's .prev(selector) method to get the previous sibling element of the target element that matches the selector:

<ul>
  <li>第一个</li>
  <li class="target">目标元素</li>
  <li>下一个</li>
  <li>再下一个</li>
</ul>

<script>
$(document).ready(function() {
  var prevElement = $('.target').prev('li');
  console.log(prevElement.text());
});
</script>

In this In the example, we first select a target element with the .target class, and then use the .prev('li') selector to get the previous li element. Finally, we use the .text() method to obtain the text content of the previous li element and output it to the console.

So, why use the .prev(selector) method? In actual development, we often need to obtain a specific sibling element in front of the target element. In this case, we can use the .prev(selector) method to filter out the elements that meet the conditions without having to traverse again. .

In addition to the .prev(selector) method, jQuery also provides some other methods for operating elements, such as .next(), which is used to obtain the target element The next sibling element; .parent(), used to get the parent element of the target element; .children(), used to get all the child elements of the target element, etc. These methods can be used in combination to easily obtain and operate elements.

Of course, jQuery also has some shortcomings. For example, when operating a large number of elements, performance may be affected. At the same time, with the popularity of ES6, the writing method of native JavaScript is becoming more and more simple and convenient, so in actual development It is necessary to choose the appropriate technical solution according to the situation.

In short, jQuery's .prev(selector) method is very useful when obtaining a specific sibling element in front of the target element, which can greatly improve development efficiency. If you haven't used jQuery yet, give it a try, I believe it will surprise you.

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