[Improvement] update actionsheet close icon style (#340)

* 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

* [Improvement] Button: use sfc instread of jsx

* [Improvement] update actionsheet close icon style

* fix: yarn.lock

* fix: icon test cases

packages/button/index.vue

@@ -0,0 +1,70 @@
+
+<template>
+  <component
+    :is="tag"
+    :type="nativeType"
+    :disabled="disabled"
+    class="van-button"
+    :class="[
+      'van-button--' + type,
+      'van-button--' + size,
+      {
+        'van-button--disabled': disabled,
+        'van-button--loading': loading,
+        'van-button--block': block,
+        'van-button--bottom-action': bottomAction
+      }
+    ]"
+      @click="onClick"
+    >
+    <van-loading
+      v-if="loading"
+      class="van-button__icon-loading"
+      type="circle"
+      :color="type === 'default' ? 'black' : 'white'"
+    />
+    <span class="van-button__text">
+      <slot></slot>
+    </span>
+  </component>
+</template>
+
+<script>
+import Loading from '../loading';
+
+export default {
+  name: 'van-button',
+
+  components: {
+    [Loading.name]: Loading
+  },
+
+  props: {
+    block: Boolean,
+    loading: Boolean,
+    disabled: Boolean,
+    nativeType: String,
+    bottomAction: Boolean,
+    tag: {
+      type: String,
+      default: 'button'
+    },
+    type: {
+      type: String,
+      default: 'default'
+    },
+    size: {
+      type: String,
+      default: 'normal'
+    }
+  },
+
+  methods: {
+    onClick(event) {
+      if (!this.loading && !this.disabled) {
+        this.$emit('click', event);
+      }
+    }
+  }
+};
+</script>