scss--函數 (Functions)--unit

• (Sass::Script::Value::String) unit($number)

Returns the unit(s) associated with a number. Complex units are sorted in alphabetical order by numerator and denominator.

該函數接受一個scss變量，返回該變量表達式的單位。複雜的表達式按照字母排序的順序進行排序。
複雜的單位是按字母順序排列的分子和分母排序。
Examples:

unit(100) => ""
unit(100px) => "px"
unit(3em) => "em"
unit(10px * 5em) => "empx"
unit(10px 5em / 30cm / 1rem) => "empx/cmrem"
Parameters:
$number (Sass::Script::Value::Number)
Returns:
(Sass::Script::Value::String) — The unit(s) of the number, as a quoted string
Raises:
(ArgumentError) — if $number isn't a number