[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/dialog/dialog.vue

@@ -18,7 +18,8 @@
         </van-button>
         <van-button
           size="large"
-          :class="['van-dialog__confirm', { 'van-hairline--left': showCancelButton && showConfirmButton }]"
+          class="van-dialog__confirm"
+          :class="{ 'van-hairline--left': showCancelButton && showConfirmButton }"
           v-show="showConfirmButton"
           @click="handleAction('confirm')"
         >