How to define and use variables in css

The native variable definition syntax in CSS is "--*", and the variable usage syntax is "var(--*)"; where * represents the variable name. CSS variables cannot contain characters such as "$", "[", "^", "(", "%", etc. Ordinary characters only need to be "numbers", "letters", "underlines" and "dashes".

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

The native variable definition syntax in CSS is: --*, The syntax for using variables is: var(--*); where * represents our variable name;

If you define css global variables in the vue project:

1, first create a new index in the assets directory .css file: (

:root The root element of the document, this is a good place to put custom attributes, because we can override custom attributes based on the selectivity of other individual special styles)

2, then introduce in the main.js file:

3, use: in the style in the .vue file Use:

background:var(--baseBackground);

More introduction:

css中定义变量

定义变量可分多种情况：
1、定义全局变量
:root {
  --borderColor: #ccc;
}
使用：width:var(--borderColor);

2、定义某元素下的变量
.look{
  --borderColor: #ccc;
}

3、定义媒体查询下的变量
@media screen and (min-width: 1025px) { 
    :root { 
        --borderColor: #ccc;
　　 }
}
使用：
.has-border-table > tr > td {
  border-right: 1px solid var(--borderColor);
}

less中定义变量
定义：
@bg-color : #d9d9d9;
使用：
.has-border-table > tr > td {
  border-right: 1px solid var(@bg-color);
}

sass中定义变量
定义：
$bg-color : #d9d9d9;
使用：
.has-border-table > tr > td {
  border-right: 1px solid var($bg-color);
}

Recommended learning: css video tutorial

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