How to use: nth-of-type (3n+1) pseudo-class selector to select CSS styles of elements of the same type whose positions meet the 3n+1 condition

How to use:nth-of-type(3n 1) pseudo-class selector to select CSS styles of elements of the same type whose positions meet the 3n 1 condition. Specific code examples are required

In CSS, we often need to apply different styles to elements at specific positions. The :nth-of-type(3n 1) pseudo-class selector provides a convenient way to select positions that meet the 3n 1 condition among elements of the same type and apply styles to them.

: The working principle of the nth-of-type(3n 1) selector is that it will select elements of the same type that satisfy the position of 3n 1. Among them, n represents an integer, 3n 1 represents the position that meets the conditions, such as 1, 4, 7, etc.

Next we will use specific code examples to illustrate how to use the :nth-of-type(3n 1) selector.

First, we need to have a set of HTML elements of the same type. Let's take an unordered list as an example:

<ul>
  <li>第1个元素</li>
  <li>第2个元素</li>
  <li>第3个元素</li>
  <li>第4个元素</li>
  <li>第5个元素</li>
  <li>第6个元素</li>
  <li>第7个元素</li>
  <li>第8个元素</li>
  <li>第9个元素</li>
  <li>第10个元素</li>
</ul>

Next, we want to apply styles to elements that meet the 3n 1 condition (i.e. positions 1, 4, 7, etc.). We can use the :nth-of-type(3n 1) selector to accomplish this task. For example, we want to set the background color of these elements to red and the font color to white. The code is as follows:

li:nth-of-type(3n+1) {
  background-color: red;
  color: white;
}

Add the above code to the CSS file and associate the CSS file with the HTML file. Open the browser and view the page. You will see that the elements at the positions that meet the 3n 1 condition have the corresponding styles applied.

I hope that through the above code examples and explanations, you have understood how to use the :nth-of-type(3n 1) pseudo-class selector to select elements of the same type that meet the 3n 1 condition and apply CSS to them. style. This technique is often used in actual projects and I hope it will be helpful to you.

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