SASS 未定义变量问题

Question

我的 sass 遇到了问题。我一直在问候一个未定义的变量错误，我不确定为什么。该代码旨在使光标悬停时使我的导航栏后面的指示器更多。有什么想法吗？

报错如下：

Error: Undefined Variable: "$i". on Line 93 of style.sass.

下面是SASS代码：

$menu-items: 5
$menu-items-loop-offset: $menu-items - 1
$width: (100/$menu-items) * 1%

.with-indicator
    @for $i from 1 through $menu-items-loop-offset
    .Nav-item:nth-child(#{$i}).is-active ~ .Nav-item:last-child:after
    left: ($width*$i)-$width
    .Nav-item:nth-child(#{$i}).is-active ~ .Nav-item:last-child:before
    left: ($width*$i)+($width/2)-$width



    @for $i from 1 through $menu-items-loop-offset
    .Nav-item:nth-child(#{$i}):hover ~ .Nav-item:last-child:after
    left: ($width*$i)-$width !important
    .Nav-item:nth-child(#{$i}):hover ~ .Nav-item:last-child:before
    left: ($width*$i)+($width/2)-$width !important


.Nav-item
    &:last-child
    &:hover, &.is-active
    &:before
    left: (100%-$width)+($width/2) !important
    &:after
    left: 100%-$width !important

在此先感谢您的帮助。

Answer 1

在您问题的代码中，两个 @for 循环的主体都是空的：

您需要缩进 @for 循环中的规则，以便它们包含在循环中：

$menu-items: 5
$menu-items-loop-offset: $menu-items - 1
$width: (100/$menu-items) * 1%

.with-indicator
    @for $i from 1 through $menu-items-loop-offset
        .Nav-item:nth-child(#{$i}).is-active ~ .Nav-item:last-child:after
        left: ($width*$i)-$width
        .Nav-item:nth-child(#{$i}).is-active ~ .Nav-item:last-child:before
        left: ($width*$i)+($width/2)-$width



    @for $i from 1 through $menu-items-loop-offset
        .Nav-item:nth-child(#{$i}):hover ~ .Nav-item:last-child:after
        left: ($width*$i)-$width !important
        .Nav-item:nth-child(#{$i}):hover ~ .Nav-item:last-child:before
        left: ($width*$i)+($width/2)-$width !important


.Nav-item
    &:last-child
    &:hover, &.is-active
    &:before
    left: (100%-$width)+($width/2) !important
    &:after
    left: 100%-$width !important

$i 变量仅在 @for 循环范围内可用。

Answer 2

您需要在@for 部分添加制表符或空格。而不是

@for
your code

写这个

@for
   your code

SASS 未定义变量问题

SASS Undefined Variable issue

html

css

sass

undefined

undefined-variable