Vue advanced: CSS3 - selectors first child, last child, Nth child, Nth last child, nth of type

No Silver Bullet 2020-11-13 07:29:22
vue advanced css3 css selectors


1.first-child(IE7 compatible )、last-child(IE8 Are not compatible )

html:

<body>
<h2> list </h2>
<ul>
<li> List items 1</li>
<li> List items 2</li>
<li> List items 3</li>
<li> List items 4</li>
</ul>
</body>

css:

<style>
ul {list-style: none;}
li:first-child {/* Style the first list item compatible IE7*/
background-color: pink;
}
li:last-child { /* Style the last list item IE8 Are not compatible */
background-color: red;
}
</style>

analysis :
No matter how many ul list , Just set first-child、last-child, So all ul The first and last list items of a list item will have a set style .

2.nth-child、nth-last-child (IE8 Are not compatible )

html:

<body>
<h2> list </h2>
<ul>
<li> List items 1</li>
<li> List items 2</li>
<li> List items 3</li>
<li> List items 4</li>
<li> List items 5</li>
<li> List items 6</li>
</ul>
</body>

css:

<style>
ul {list-style: none;}
li:nth-child(3) { /* Express li In the elements , The third element IE8 Are not compatible */
background-color: pink;
}
li:nth-last-child(2) { /* Express li In the elements , The next to last element IE8 Are not compatible */
background-color: red;
}
</style>

3. For odd numbers 、 Even numbers use styles

html:

<ul>
<li> List items 1</li>
<li> List items 2</li>
<li> List items 3</li>
<li> List items 4</li>
<li> List items 5</li>
<li> List items 6</li>
</ul>

css:

<style>
ul {list-style: none;}
li:nth-child(odd) {/* Express li In the elements , from 1 Start The odd number is pink*/
background-color: pink;
}
li:nth-child(even) {/* Express li In the elements , from 1 Start Even numbers are gray */
background-color: #ccc;
}
</style>

analysis : li:nth-child(odd) meaning :li Parent element of ul Of the sons of , from 1 Starting number , Odd sons set the style to xxx;
When the parent element is a list , Because only the list item is a sub element , No problem ; When the parent element is div when , There's more than one seed element , Can cause problems . as follows :
for example : Set up div Odd titles in the element h2 The background color

html:

<div>
<h2> Article title A</h2>
<p> I'm a short paragraph ...</p>
<h2> Article title B</h2>
<p> I'm a short paragraph ...</p>
<h2> Article title C</h2>
<p> I'm a short paragraph ...</p>
<h2> Article title D</h2>
<p> I'm a short paragraph ...</p>
</div>

css:

h2:nth-child(odd) {
background-color: pink;
}

The execution result is :

analysis : h2:nth-child(odd) The meaning is :h2 Parent element of div Of all the sons of For odd sons Set the background color ; Not all h2 Even number in h2 Set the style ;
resolvent : nth-of-type It can avoid problems .

4.nth-of-type(IE8 Are not compatible ): Only for elements of the same type

css:

h2:nth-of-type(odd) { /* all h2 Set styles for odd numbers in the tag */
background-color: pink;
}
h2:nth-of-type(even) { /* all h2 Set styles for even numbers in tags */
background-color: #ccc;
}

analysis : h2:nth-of-type(odd) meaning : In all h2 In the label , As long as it's an odd number h2 Just set the style ; Only aim at h2 label , It has nothing to do with the parent element ;

5、 Recycle patterns li:nth-child(4n+1)

html:

<ul>
<li> List items 1</li>
<li> List items 2</li>
<li> List items 3</li>
<li> List items 4</li>
<li> List items 5</li>
<li> List items 6</li>
<li> List items 7</li>
<li> List items 8</li>
<li> List items 9</li>
<li> List items 10</li>
<li> List items 11</li>
<li> List items 12</li>
</ul>

css:

<style>
ul {list-style: none;}
li:nth-child(4n+1) { /* Express li In the elements ,4 individual li For a set of cycles first li Set to */
background-color: red;
}
li:nth-child(4n+2) { /* Express li In the elements ,4 individual li For a set of cycles the second li Set to */
background-color: pink;
}
li:nth-child(4n+3) {
background-color: #ccc;
}
li:nth-child(4n+4) {
background-color: yellow;
}
</style>

analysis :
4n meaning : four li Elements are a set of loops ;
4n+1 meaning : In this set of cycles , The first pattern ;
4n+2 meaning : In this set of cycles , Second style ;

4n+3 meaning : In this set of cycles , The third pattern ;
4n+4 meaning : In this set of cycles , The fourth pattern ;

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