message: [bugfix] Actionsheet: item unclickable when loading
diff: <ul v-else class="van-hairline--bottom">
  <li
  v-for="item in actions"
  - :class="[b('item', { disabled: item.disabled }), item.className, 'van-hairline--top']"
  + :class="[b('item', { disabled: item.disabled || item.loading }), item.className, 'van-hairline--top']"
  @click.stop="onClickItem(item)"
  >
  <template v-if="!item.loading">
  @@ -60,7 +60,7 @@ export default create({
  methods: {
  onClickItem(item) {
  - if (item.callback && !item.disabled) {
  + if (item.callback && !item.disabled && !item.loading) {
  item.callback(item);
  }
  },
  