sass primary grammar

The sass syntax used is:

sass --watch test.scss:test.css --style compact --style expanded

As shown below:

1 Custom variable

test.scss content is:

<span style="color: #000000;">$color: black;
.test1 {
    background-color: $color;
} </span>

The content compiled into test.css is:

<span style="color: #000000;">.test1 {
  background-color: black;
}</span>

2 Add variables to the string

test.scss content is:

<span style="color: #000000;">$left: left;
.test2 {
    border-#{$left}:1px  #000 solid;
}</span>

The content compiled into test.css is:

<span style="color: #000000;">.test2 {
  border-left: 1px  #000 solid;
}</span>

3 Add, subtract, multiply and divide within the pattern (pay attention to writing division)

test.scss content is:

<span style="color: #000000;">$para:4;
.test3 {
    height: 5px+3px;
    width: (14px/7);
    right: $para*4;
}</span>

The content compiled into test.css is:

<span style="color: #000000;">.test3 {
  height: 8px;
  width: 2px;
  right: 16;
}</span>

4 sub-element writing

test.scss content is:

<span style="color: #000000;">.test4 {
    .lala {
        color: pink;
    }
}</span>

The content compiled into test.css is:

<span style="color: #000000;">.test4 .lala {
  color: pink;
}</span>

5 Inheritance (SASS allows one selector to inherit another selector)

test.scss content is:

<span style="color: #000000;">.class1 {
    border-left: 1px #000 solid;
}
.class2 {
    @extend .class1;
    font-size: 15px;
}</span>

The content compiled into test.css is:

<span style="color: #000000;">.class1, .class2 {
  border-left: 1px #000 solid;
}
.class2 {
  font-size: 15px;
}</span>

6 Reuse code blocks

The content of test.scss is: (no variables)

<span style="color: #000000;">@mixin test6 {
    height: 5px;
    left: 20px;
    top: 10px;
}
.lili {
    @include test6;
}</span>

The content compiled into test.css is: (no variables)

<span style="color: #000000;">.lili {
  height: 5px;
  left: 20px;
  top: 10px;
}</span>

What’s very useful about this method is that you can set variables, as follows:

The content of test.scss is: (with variables)

<span style="color: #000000;">@mixin test62($height) {
    height: $height;
    left: 20px;
    top: 10px;
}
.lili2 {
    @include test62(100px);
}</span>

The content compiled into test.css is: (with variables)

<span style="color: #000000;">.lili2 {
  height: 100px;
  left: 20px;
  top: 10px;
}</span>

7 functions

test.scss content is:

<span style="color: #000000;">@function aa($color) {
    @return $color;
}
.test7 {
    color: aa(pink);
}</span>

The content compiled into test.css is:

<span style="color: #000000;">/*example 07*/
.test7 {
  color: pink;
}</span>

8 Import external scss or css files

test.scss content is:

@import 'more.scss' 

more.scss content is:

<span style="color: #000000;">$width: 30px;
.test8 {
    width: $width;
}</span>

The content compiled into test.css is:

<span style="color: #000000;">.test8 {
  width: 30px;
}</span>