[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/badge/index.vue

@@ -1,5 +1,5 @@
 <template>
-  <a :class="['van-badge van-hairline', { 'van-badge--select': isSelect }]" :href="url" @click="onClick">
+  <a class="van-badge van-hairline" :class="{ 'van-badge--select': isSelect }" :href="url" @click="onClick">
     <div v-if="info" class="van-badge__info">{{ info }}</div>
     {{ title }}
   </a>