问题
Hi I'm trying to learn SASS/SCSS and am trying to refactor my own mixin for clearfix
what I'd like is for the mixin to be based on whether I pass the mixin a width.
thoughts so far (pseudo code only as I will be including other mixins)
@mixin clearfix($width) {
@if !$width {
// if width is not passed, or empty do this
} @else {
display: inline-block;
width: $width;
}
}
here's how I thought I might call it, but it's not working.
@include clearfix();
or
@include clearfix(100%)
or
@include clearfix(960px)
I'd appreciate any help on the best or right way to do this!
回答1:
You could try this:
$width:auto;
@mixin clearfix($width) {
@if $width == 'auto' {
// if width is not passed, or empty do this
} @else {
display: inline-block;
width: $width;
}
}
I'm not sure of your intended result, but setting a default value should return false.
回答2:
You can assign default parameter values inline when you first create the mixin:
@mixin clearfix($width: 'auto') {
@if $width == 'auto' {
// if width is not passed, or empty do this
} @else {
display: inline-block;
width: $width;
}
}
回答3:
You could default the parameter to null or false.
This way, it would be shorter to test if a value has been passed as parameter.
@mixin clearfix($width: null) {
@if not ($width) {
// if width is not passed, or empty do this
} @else {
display: inline-block;
width: $width;
}
}
来源：https://stackoverflow.com/questions/5456467/syntax-for-if-else-condition-in-scss-mixin