Web front end -- CSS

Hee hee hee hee hee 2020-11-13 01:57:48
web end css


CSS Cascading style sheets

One 、CSS Introduce

CSS Refers to cascading style sheets (Cascading Style Sheets) Define how to display controls HTML Elements , To beautify HTML Webpage .

CSS The advantages of

In order to make the style of web page elements richer , In order to separate the content and style of the web page ,CSS From this thought came , With CSS,html Most of the presentation style labels are discarded ,html Only responsible for the structure and content of the document , The form of expression is entirely given to CSS,html Documents become more concise .

Two 、CSS Basic syntax

Format :

Selectors { attribute : value ; attribute : value ; attribute : value ;…}

CSS Introduce methods :

Inline : By tagging style attribute , Write the style directly on the label .

<div style="width: 100px; height: 100px; color: red"></div>

The embedded : adopt style label , Create an embedded stylesheet on a web page .

<style type="text/css">
div{

width: 100px;
height: 100px;
color: red;
};
</style>

Extraneous : adopt link label , Link to external style sheet to page .

<link rel="stylesheet" type="text/css" href="daongtaitianjia.html">

3、 ... and 、 Commonly used CSS style

Text settings
 color Set the color of the text , Such as : color:red;
font-size Set the size of the text , Such as :font-size:12px;
font-family Set the font of the text , Such as :font-family:' Microsoft YaHei ';
font-style Set whether the font is slanted , Such as :font-style:'normal';
Set no tilt ,font-style:'italic'; Set text skew
font-weight Set whether the text is bold , Such as :
font-weight:bold; Set bold
font-weight:normal Set no bold
font Set several attributes of the text at the same time , There is a compatibility problem with the order of writing , It is suggested to write in the following order :
font: Is it bold Font size / Row height typeface ; Such as : font:normal 12px/36px ' Microsoft YaHei ';
line-height Set the line height of the text , Such as :line-height:24px;
text-decoration Underline text , Such as :text-decoration:none; Remove the underline from the text
text-indent Set the first line of text to indent , Such as :text-indent:24px; Set the first line of text to indent 24px
text-align Set text horizontal alignment , Such as text-align:center Set text to center horizontally
css Color representation
css There are three main ways to express the color value :
1、 The color name means , such as :red Red ,gold golden
2、rgb Express , such as :rgb(255,0,0) It means red
3、16 The decimal number indicates , such as :#ff0000 It means red , This can be abbreviated as #f00

Four 、 Basic selector

tag chooser

tag chooser , This kind of selector has a wide range of influence , It is recommended to apply it to the level selector as much as possible . give an example :

*{
padding:0;
margin: 0;
}
id Selectors

adopt id Name to choose elements , Elemental id The name cannot be repeated , So a style setting item can only correspond to one element on the page , It can't be reused ,id The name is usually used by the program , So... Is not recommended id As a selector . give an example :

#content{
color: rebeccapurple;
}
Class selectors

Select elements by class name , A class can be applied to multiple elements , You can also use multiple classes on one element , Application flexibility , Reusable , yes css One of the most used selectors in . give an example :

.content{
border: 2px gray solid;
width: 302px;
height: 450px;
padding: 3px;
margin: auto;
margin-top: 50px;
}
Hierarchy selector

It is mainly used to select the child element under the parent element , Or the child element below the child element , Can be used in combination with label elements , Reduce naming , At the same time, you can also go through the hierarchy , Prevent naming conflicts . give an example :

.content .content_title{
font-size: 20px;
color: blue;
border: 1px gray dashed;
padding-left: 10px;
}
Group selector

Multiple selectors , If you have the same style settings , You can use the group selector .
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Pseudo class and pseudo element selector

The commonly used pseudo class selectors are hover, Indicates the state of the mouse hovering over an element , Pseudo element selectors have before and after, They can insert content into elements through styles .
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5、 ... and 、 Box model

all HTML Elements can be seen as boxes , stay CSS in ,"box model" The term is used in design and layout .
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Box configuration
 Margin( Margin ) - Clear the area outside the border , The outer margin is transparent .
Border( Frame ) - The border around the inside margin and the outside of the content .
Padding( padding ) - Clear the area around the content , The inside margin is transparent .
Content( Content ) - The contents of the box , Show text and images .

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Box width and height calculation
 The width of the total element = Width + padding-left + Right fill + The left margin
+ Right margin + The left margin + The right margin
The height of the total element = Height + Top filling + Bottom filling + On the border
+ Under the frame + From the above + Bottom margin

6、 ... and 、CSS float

What is? CSS Float( float )?

CSS Of Float( float ), Causes the element to move left or right , The elements around it will also rearrange .
Float( float ), Often used for images , But it's also very useful in layout .

How elements float ?

The element floats horizontally , It means that elements can only move left and right, not up and down .
A floating element will try to move left or right , Until its outer edge touches the border of the containing box or another floating box .
The element after the floating element will surround it .
Elements before floating elements will not be affected .
If the image is floating right , The following text stream will wrap around it to the left :
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Case realization

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Case study 2 Insert picture description here

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