在Bootstrap 3中我用这个：
.something {
padding: 5px;
@media screen and (min-width: $screen-sm-min) {
padding: 20px;
}
@media screen and (min-width: $screen-md-min) {
padding: 40px;
}
}
我如何在Boostrap 4-alpha中做同样的事情？我在他们的文档中找不到一个例子。
这是在variables.scss中
$grid-breakpoints: ( xs: 0,sm: 576px,md: 768px,lg: 992px,xl: 1200px ) !default; @include _assert-ascending($grid-breakpoints,"$grid-breakpoints"); @include _assert-starts-at-zero($grid-breakpoints);
解决方法
使用这样的断点mixins：
.something {
padding: 5px;
@include media-breakpoint-up(sm) {
padding: 20px;
}
@include media-breakpoint-up(md) {
padding: 40px;
}
}
v4 alpha6 breakpoints reference
以下完整选项和值。
断点& up(切换值及以上)：
@include media-breakpoint-up(xs) { ... }
@include media-breakpoint-up(sm) { ... }
@include media-breakpoint-up(md) { ... }
@include media-breakpoint-up(lg) { ... }
@include media-breakpoint-up(xl) { ... }
断点和价值观：
// Extra small devices (portrait phones,less than 576px)
// No media query since this is the default in Bootstrap
// Small devices (landscape phones,576px and up)
@media (min-width: 576px) { ... }
// Medium devices (tablets,768px and up)
@media (min-width: 768px) { ... }
// Large devices (desktops,992px and up)
@media (min-width: 992px) { ... }
// Extra large devices (large desktops,1200px and up)
@media (min-width: 1200px) { ... }
断点和向下(切换值和向下)：
@include media-breakpoint-down(xs) { ... }
@include media-breakpoint-down(sm) { ... }
@include media-breakpoint-down(md) { ... }
@include media-breakpoint-down(lg) { ... }
断点和下降值：
// Extra small devices (portrait phones,less than 576px)
@media (max-width: 575px) { ... }
// Small devices (landscape phones,less than 768px)
@media (max-width: 767px) { ... }
// Medium devices (tablets,less than 992px)
@media (max-width: 991px) { ... }
// Large devices (desktops,less than 1200px)
@media (max-width: 1199px) { ... }
// Extra large devices (large desktops)
// No media query since the extra-large breakpoint has no upper bound on its width
仅限断点：
@include media-breakpoint-only(xs) { ... }
@include media-breakpoint-only(sm) { ... }
@include media-breakpoint-only(md) { ... }
@include media-breakpoint-only(lg) { ... }
@include media-breakpoint-only(xl) { ... }
仅限断点值(仅在值之间切换)：
// Extra small devices (portrait phones,576px and up)
@media (min-width: 576px) and (max-width: 767px) { ... }
// Medium devices (tablets,768px and up)
@media (min-width: 768px) and (max-width: 991px) { ... }
// Large devices (desktops,992px and up)
@media (min-width: 992px) and (max-width: 1199px) { ... }
// Extra large devices (large desktops,1200px and up)
@media (min-width: 1200px) { ... }