scss--函数 (Functions)--unitless

• (Sass::Script::Value::Bool) unitless($number)

Returns whether a number has units.

Examples:

unitless(100) => true
unitless(100px) => false

Parameters:
$number (Sass::Script::Value::Number)

Returns:
(Sass::Script::Value::Bool)

Raises:
(ArgumentError) — if $number isn't a number

该scss 函数接受一个scssscript 变量，用于判断接收的值是否带有单位，若是是则返回false,不然返回true.