13.3. Sass variable

发布时间 ：2024-02-28 23:00:07 UTC      

Variables are used to store some information and can be reused.

Sass variables can store the following information:

  • String

  • Figures

  • Color value

  • Boolean value

  • List

  • Null value

Sass variable use $ symbol:

$variablename: value;

The following example sets four variables: myFont , myColor , myFontSize , and myWidth .

After the variable is declared, we can use it in the code:

13.3.1. Sass code: 

$myFont: Helvetica, sans-serif;
$myColor: red;
$myFontSize: 18px;
$myWidth: 680px;
body {
  font-family: $myFont;
  font-size: $myFontSize;
  color: $myColor;
}
#container {
  width: $myWidth;
}

Convert the above code to CSS code, as follows:

13.3.2. Css Code: 

body {
  font-family: Helvetica, sans-serif;
  font-size: 18px;
  color: red;
}
#container {
  width: 680px;
}

Sass scope

The scope of a Sass variable can only have an effect at the current level, as follows the h1 style of the green , p tag is for red .

Sass code:

$myColor: red;
h1 {
  $myColor: green;   // Only useful in h1, local scope
  color: $myColor;
}
p {
  color: $myColor;
}

Convert the above code to CSS code, as follows:

Css Code:

h1 {
  color: green;
}
p {
  color: red;
}

13.3.3. !global

That’s for sure Sass , we can use the !global keyword to set the variable is global:

Sass code

$myColor: red;
h1 {
  $myColor: green !global;  // Global scope
  color: $myColor;
}
p {
  color: $myColor;
}

Now the p style of the label becomes green .

Convert the above code to CSS code, as follows:

Css code

h1 {
  color: green;
}
p {
  color: green;
}

Note: all global variables are generally defined in the same file, such as: \_globals.scss and then we use the @include to include the file.

文章链接 ： 13.3. Sass variable
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