How to write jquery selector interval

jQuery is a very powerful JavaScript library, which has become one of the most popular front-end development frameworks today. In jQuery, selectors are a very important and frequently used concept, and selector intervals are an important form of selectors, which allow us to select specific elements very flexibly. This article will introduce the syntax and usage of jQuery selector range.

<li>Range selector syntax

The range selector is written by separating the commas between the two selectors. For example, we can use the following selector to select the 2nd to 4th <li> elements:

$('li:nth-child(n+2):nth-child(-n+4)')

In the above selector, :nth-child(n 2) means selecting the 2nd and all elements after it, while :nth-child(-n 4) means selecting the 4th and all elements before it. By connecting these two selectors with a comma, you can select the second to fourth <li> elements.

<li>How to use range selectors

In actual development, we often need to use range selectors to select a continuous range of elements. Below are some specific application scenarios.

2.1 Select the first n elements

Sometimes, we need to select the first few elements in a list, you can use the following selector:

$('#myList li:lt(n)')

Among the above selectors , :lt(n) means selecting elements with index less than n. For example, if we want to select the first 3 <li> elements, we can set n to 3.

2.2 Select the last n elements

Similarly, we can also use similar syntax to select the last element, that is:

$('#myList li:gt(-n)')

In the above selector, :gt(-n) means selecting elements with index greater than -n. For example, if we want to select the last 3 <li> elements, we can set n to 3.

2.3 Select the middle segment of elements

In addition to the first n and last n elements, we can also select the middle segment of continuous elements. For example, if we need to select the 2nd to 5th <li> elements, we can use the following selector:

$('#myList li:nth-child(n+2):nth-child(-n+5)')

Among the above selectors, :nth-child( n 2) means selecting the 2nd and all elements after it, while :nth-child(-n 5) means selecting the 5th and all elements before it. By connecting these two selectors with a comma, you can select the second to fifth <li> elements.

<li>Summary

This article introduces the syntax and usage of jQuery selector interval. Through the selector interval, we can select a continuous element very flexibly. In actual development, selector intervals are very commonly used and can greatly improve development efficiency.

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