<cn>
#### 基本用法
默认选中第一项。
</cn>

<us>
#### basic Usage
Default activate first tab.
</us>

```html

<template>
<div>
  <a-tabs defaultActiveKey="1" @change="callback">
    <a-tab-pane tab="Tab 1" key="1">Content of Tab Pane 1</a-tab-pane>
    <a-tab-pane tab="Tab 2" key="2" forceRender>Content of Tab Pane 2</a-tab-pane>
    <a-tab-pane tab="Tab 3" key="3">Content of Tab Pane 3</a-tab-pane>
  </a-tabs>
</div>
</template>
<script>
export default {
  data () {
    return {
    }
  },
  methods: {
    callback (key) {
      console.log(key)
    },
  },
}
</script>
```
