[Improvement] optimize staticClass (#337)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

* [Doc] translate theme & demo pages

* [Doc] add Internationalization document

* [bugfix] remove unnecessary props

* [fix] optimize clickoutside

* [new feature] optimize find-parent

* [new feature]: change document title accordinng to language

* [new feature] Pagination code review

* [improvement] adjust icon-font unicode

* [improvement] Icon spinner color inherit

* [improvement] icon default width

* [bugfix] DateTimePicker validate date props

* [bugfix] Tab item text ellipsis

* [improvement] optimize single line ellipsis

* [Improvement] optimzie staticClass

packages/notice-bar/index.vue

@@ -1,7 +1,8 @@
 <template>
   <div
     v-show="showNoticeBar"
-    :class="['van-notice-bar', { 'van-notice-bar--withicon': mode }]"
+    class="van-notice-bar"
+    :class="{ 'van-notice-bar--withicon': mode }"
     :style="barStyle"
     @click="$emit('click')"
   >
@@ -11,7 +12,8 @@
     <div class="van-notice-bar__content-wrap" ref="contentWrap">
       <div
         ref="content"
-        :class="['van-notice-bar__content', animationClass]"
+        class="van-notice-bar__content"
+        :class="animationClass"
         :style="contentStyle"
         @animationend="onAnimationEnd"
       >