补充 label 样式

scss/_mixins.scss

@@ -392,3 +392,14 @@
     $gap-sm;
   color: $text--muted-color;
 }
+
+@mixin label-variant($color) {
+  background-color: $color;
+
+  &[href] {
+    &:hover,
+    &:focus {
+      background-color: darken($color, 10%);
+    }
+  }
+}

scss/_utilities.scss

@@ -1517,6 +1517,69 @@
   word-wrap: break-word;
 }
 
+//
+// Labels
+// --------------------------------------------------
+
+.label {
+  display: inline;
+  padding: 0.2em 0.6em 0.3em;
+  font-size: 75%;
+  font-weight: 700;
+  line-height: 1;
+  color: $label-color;
+  text-align: center;
+  white-space: nowrap;
+  vertical-align: baseline;
+  border-radius: 0.25em;
+
+  // Empty labels collapse automatically (not available in IE8)
+  &:empty {
+    display: none;
+  }
+
+  // Quick fix for labels in buttons
+  .btn & {
+    position: relative;
+    top: -1px;
+  }
+}
+a.label {
+  &:hover,
+  &:focus {
+    color: $label-link--hover-color;
+    text-decoration: none;
+    cursor: pointer;
+  }
+}
+
+// Colors
+// Contextual variations (linked labels get darker on :hover)
+
+.label-default {
+  @include label-variant($label--default-bg);
+}
+
+.label-primary {
+  @include label-variant($label--primary-bg);
+}
+
+.label-success {
+  @include label-variant($label--success-bg);
+}
+
+.label-info {
+  @include label-variant($label--info-bg);
+}
+
+.label-warning {
+  @include label-variant($label--warning-bg);
+}
+
+.label-danger {
+  @include label-variant($label--danger-bg);
+}
+
 @keyframes apearSensor {
   from {
     opacity: 0;

scss/_variables.scss

@@ -138,6 +138,16 @@ $gap-lg: px2rem(30px) !default;
 $icon-color: $gray600 !default;
 $icon-onHover-color: $gray900 !default;
 
+$label--default-bg: $gray700 !default;
+$label--primary-bg: $primary !default;
+$label--success-bg: $success !default;
+$label--info-bg: $info !default;
+$label--warning-bg: $warning !default;
+$label--danger-bg: $danger !default;
+
+$label-color: #fff !default;
+$label-link--hover-color: #fff !default;
+
 // Components
 $scrollbar-width: px2rem(17px) !default;