The difference between nth-child and nth-of-type in CSS3 and their usage tips-CSS Tutorial-php.cn

The difference between nth-child and nth-of-type in CSS3 and their usage tips

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Release： 2018-03-22 11:27:46

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This time I will bring you the differences and usage tips between nth-child and nth-of-type in CSS3. What are the precautions when using nth-child and nth-of-type? Here are Let’s take a look at practical cases.

The difference between nth-child and nth-of-type in CSS3 is actually very simple: Why is :nth-of-type called :nth-of-type? Because it is distinguished by "type". That is to say: ele:nth-of-type(n) refers to the nth ele element under the parent element, and ele:nth-child(n) refers to the nth element under the parent element and this element is ele. If If not, the selection fails.

The text may sound rather obscure and is easier to understand. Here is a small example:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
</head>
<style>
.demo li:nth-child(2){
color: #ff0000;
}
.demo li:nth-of-type(2){
color: #00ff00;
}
</style>
<body>
<p>
<ul class="demo">
<p>zero</p>
<li>one</li>
<li>two</li>
</ul>
</p>
</body>
</html>

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The results are as follows:

The above For example, .demo li:nth-child(2) selects the

one

node, while .demo li:nth-of-type(2) selects

twoNode.

But what if no tags are specified before nth-child and nth-of-type?

.demo :nth-child(2){
color: #ff0000;
}
.demo :nth-of-type(2){
color: #00ff00;
}

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What will be the result of this? Look at the html structure:

<ul class="demo">
<p>first p</p>
<li>first li</li>
<li>second li</li>
<p>second p</p>
</ul>

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Result:

As can be seen above, before them Without specifying the tag type, :nth-child(2) still selects the second element, no matter what tag it is. And :nth-type-of(2) selects two elements, which are the second p tag and the second li tag in the parent.demo. It can be seen that when the tag type is not specified, :nth-type -of(2) will select the second of all type tags.

We have already understood the basic usage and differences of nth-child and nth-of-type, then go further in nth-of-type(n) and nth-child(n) What is n?

nth-of-type(n) and nth-child(n) n can be a number, keyword or formula. Numbers: This is the use of the above examples, so I won’t go into details. Keywords: Odd, even

Odd and even are keywords that can be used to match sub-elements with odd or even subscripts

Note: the first sub-element The subscript of is 1

Here, we specify two different background colors for odd and even p elements:

p:nth-of-type(odd)
{
background:#ff0000;
}
p:nth-of-type(even)
{
background:#0000ff;
}

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Formula: Or arithmeticExpression

Use the formula (an + b). Description: Indicates the length of the period, n is the counter (starting from 0), and b is the offset value.

Here, we specify the background color of all p elements whose subscripts are multiples of 3:

p:nth-of-type(3n+0)
{
background:#ff0000;
}

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I believe you have mastered the method after reading the case in this article. Please pay attention to php for more exciting things. Other related articles on the Chinese website!