ant-design-vue/components/tabs/demo/extra.vue

<template>
<div>
  <Tabs :tabBarExtraContent="operations">
    <TabPane tab="Tab 1" key="1">Content of tab 1</TabPane>
    <TabPane tab="Tab 2" key="2">Content of tab 2</TabPane>
    <TabPane tab="Tab 3" key="3">Content of tab 3</TabPane>
  </Tabs>
  <Tabs>
    <TabPane tab="Tab 1" key="1">Content of tab 1</TabPane>
    <TabPane tab="Tab 2" key="2">Content of tab 2</TabPane>
    <TabPane tab="Tab 3" key="3">Content of tab 3</TabPane>
    <a-button slot="tabBarExtraContent">Extra Action</a-button>
  </Tabs>
</div>

</template>
<script>
import { Tabs, Button } from 'antd'
export default {
  methods: {
    operations (h) {
      return h('span', [<Button>Extra Action</Button>])
    },
  },
  components: {
    Tabs,
    TabPane: Tabs.TabPane,

  },
}
</script>