带插值变量的数学? [英] Math with interpolated variables?

问题描述

考虑以下 sass:

$font-size: 18;                 
$em: $font-size;

$column: $font-size * 3;        // The column-width of my grid in pixels
$gutter: $font-size * 1;        // The gutter-width of my grid in pixels

$gutter-em: #{$gutter / $em}em; // The gutter-width in ems.
$column-em: #{$column / $em}em; // The column-width in ems;

$foo = $gutter-em / 2; // This results in a value like "1em/2". :(
$bar = ($gutter-em / 2); // this doesn't work either, same as above.

如何生成一个有效的 $foo，并且可以在其他表达式中进一步重用?

How can I generate a $foo that works, and that I can reuse further in other expressions?

推荐答案

Sass 不能对字符串进行算术运算，只能进行连接.当您使用插值时，您创建的是一个看起来像一个数字的字符串:

Sass cannot perform arithemetic operations on strings, only concatenation. When you use interpolation, what you've created is a string that looks like a number:

@debug type-of(#{10px});         // string
@debug type-of('10px');          // string
@debug type-of(unquote('10px')); // string
@debug type-of(10px);            // number

如果你想要一个数字，不要使用插值，也不要使用引号.要将整数(例如 10)转换为长度(例如 10px)，请使用乘法:

If you want a number, do not use interpolation and do not use quotes. For converting an integer (eg. 10) to a length (eg. 10px), use multiplication:

$gutter-em: ($gutter / $em) * 1em;
@debug type-of($gutter-em);      // number

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