SASS 编译空的 CSS 文件？

Question

我正在尝试将这一小段 SCSS 编译为 CSS：

$font-size: 16px;
$em: $font-size / 1em;

$column: 48px;
$gutter: 24px;

 $cols1: ( 1 * ($column + $gutter) - $gutter) / $em;
 $cols2: ( 2 * ($column + $gutter) - $gutter) / $em;
 $cols3: ( 3 * ($column + $gutter) - $gutter) / $em;
 $cols4: ( 4 * ($column + $gutter) - $gutter) / $em;
 $cols5: ( 5 * ($column + $gutter) - $gutter) / $em;
 $cols6: ( 6 * ($column + $gutter) - $gutter) / $em;
 $cols7: ( 7 * ($column + $gutter) - $gutter) / $em;
 $cols8: ( 8 * ($column + $gutter) - $gutter) / $em;
 $cols9: ( 9 * ($column + $gutter) - $gutter) / $em;
$cols10: (10 * ($column + $gutter) - $gutter) / $em;
$cols11: (11 * ($column + $gutter) - $gutter) / $em;
$cols12: (12 * ($column + $gutter) - $gutter) / $em;
$cols13: (13 * ($column + $gutter) - $gutter) / $em;
$cols14: (14 * ($column + $gutter) - $gutter) / $em;
$cols15: (15 * ($column + $gutter) - $gutter) / $em;
$cols16: (16 * ($column + $gutter) - $gutter) / $em;

用sass grid.scss grid.css 和sass --watch grid.scss:grid.css 都试过了——我得到的只是一个空白的css文件。这是怎么回事？

Answer 1

正如@pjumble 评论所述，您只是在定义变量。获取您的代码并添加额外的 hello_world 语句：

$font-size: 16px;
$em: $font-size / 1em;

$column: 48px;
$gutter: 24px;

 $cols1: ( 1 * ($column + $gutter) - $gutter) / $em;
 $cols2: ( 2 * ($column + $gutter) - $gutter) / $em;
 $cols3: ( 3 * ($column + $gutter) - $gutter) / $em;
 $cols4: ( 4 * ($column + $gutter) - $gutter) / $em;
 $cols5: ( 5 * ($column + $gutter) - $gutter) / $em;
 $cols6: ( 6 * ($column + $gutter) - $gutter) / $em;
 $cols7: ( 7 * ($column + $gutter) - $gutter) / $em;
 $cols8: ( 8 * ($column + $gutter) - $gutter) / $em;
 $cols9: ( 9 * ($column + $gutter) - $gutter) / $em;
$cols10: (10 * ($column + $gutter) - $gutter) / $em;
$cols11: (11 * ($column + $gutter) - $gutter) / $em;
$cols12: (12 * ($column + $gutter) - $gutter) / $em;
$cols13: (13 * ($column + $gutter) - $gutter) / $em;
$cols14: (14 * ($column + $gutter) - $gutter) / $em;
$cols15: (15 * ($column + $gutter) - $gutter) / $em;
$cols16: (16 * ($column + $gutter) - $gutter) / $em;

.hello_world{ width: $column }

命令sass grid.scss grid.css 产生：

.hello_world {
  width: 48px; }