[new feature] Tabbar: add active-color prop (#2372)

packages/tabbar/demo/index.vue

@@ -24,7 +24,7 @@
       </van-tabbar>
     </demo-block>
 
-    <demo-block :title="$t('title2')">
+    <demo-block :title="$t('customIcon')">
       <van-tabbar v-model="active2">
         <van-tabbar-item info="3">
           <span>{{ $t('custom') }}</span>
@@ -38,6 +38,18 @@
         <van-tabbar-item icon="setting-o">{{ $t('tab') }}</van-tabbar-item>
       </van-tabbar>
     </demo-block>
+
+    <demo-block :title="$t('customColor')">
+      <van-tabbar
+        v-model="active3"
+        active-color="#4b0"
+      >
+        <van-tabbar-item icon="home-o">{{ $t('tab') }}</van-tabbar-item>
+        <van-tabbar-item icon="search">{{ $t('tab') }}</van-tabbar-item>
+        <van-tabbar-item icon="friends-o">{{ $t('tab') }}</van-tabbar-item>
+        <van-tabbar-item icon="setting-o">{{ $t('tab') }}</van-tabbar-item>
+      </van-tabbar>
+    </demo-block>
   </demo-section>
 </template>
 
@@ -45,10 +57,12 @@
 export default {
   i18n: {
     'zh-CN': {
-      title2: '自定义图标'
+      customIcon: '自定义图标',
+      customColor: '自定义颜色'
     },
     'en-US': {
-      title2: 'Custom icon'
+      customIcon: 'Custom icon',
+      customColor: 'Custom Color'
     }
   },
 
@@ -56,6 +70,7 @@ export default {
     return {
       active: 0,
       active2: 0,
+      active3: 0,
       icon: {
         normal: 'https://img.yzcdn.cn/public_files/2017/10/13/c547715be149dd3faa817e4a948b40c4.png',
         active: 'https://img.yzcdn.cn/public_files/2017/10/13/793c77793db8641c4c325b7f25bf130d.png'