## Timeline 时间线

可视化地呈现时间流信息。

### 基础用法

Timeline 可拆分成多个按照时间戳排列的 activity，时间戳是其区分于其他控件的重要特征，使⽤时注意与 Steps 步骤条等区分。

:::demo
```html
<div class="block">
  <el-timeline>
    <el-timeline-item
      v-for="(activity, index) in activities"
      :key="index"
      :timestamp="activity.timestamp">
      {{activity.content}}
    </el-timeline-item>
  </el-timeline>
</div>

<script>
  export default {
    data() {
      return {
        activities: [{
          content: '活动按期开始',
          timestamp: '2018-04-15'
        }, {
          content: '通过审核',
          timestamp: '2018-04-13'
        }, {
          content: '创建成功',
          timestamp: '2018-04-11'
        }]
      };
    }
  };
</script>
```
:::

### ⾃定义节点样式

可根据实际场景⾃定义节点尺⼨、颜⾊，或直接使⽤图标。

:::demo
```html
<div class="block">
  <el-timeline>
    <el-timeline-item
      v-for="(activity, index) in activities"
      :key="index"
      :icon="activity.icon"
      :type="activity.type"
      :color="activity.color"
      :size="activity.size"
      :timestamp="activity.timestamp">
      {{activity.content}}
    </el-timeline-item>
  </el-timeline>
</div>

<script>
  export default {
    data() {
      return {
        activities: [{
          content: '支持使用图标',
          timestamp: '2018-04-12 20:46',
          size: 'large',
          type: 'primary',
          icon: 'el-icon-more'
        }, {
          content: '支持自定义颜色',
          timestamp: '2018-04-03 20:46',
          color: '#0bbd87'
        }, {
          content: '支持自定义尺寸',
          timestamp: '2018-04-03 20:46',
          size: 'large'
        }, {
          content: '默认样式的节点',
          timestamp: '2018-04-03 20:46'
        }]
      };
    }
  };
</script>
```
:::

### ⾃定义时间戳

当内容在垂直⽅向上过⾼时，可将时间戳置于内容之上。

:::demo
```html
<div class="block">
  <el-timeline>
    <el-timeline-item timestamp="2018/4/12" placement="top">
      <el-card>
        <h4>更新 Github 模板</h4>
        <p>王小虎 提交于 2018/4/12 20:46</p>
      </el-card>
    </el-timeline-item>
    <el-timeline-item timestamp="2018/4/3" placement="top">
      <el-card>
        <h4>更新 Github 模板</h4>
        <p>王小虎 提交于 2018/4/3 20:46</p>
      </el-card>
    </el-timeline-item>
    <el-timeline-item timestamp="2018/4/2" placement="top">
      <el-card>
        <h4>更新 Github 模板</h4>
        <p>王小虎 提交于 2018/4/2 20:46</p>
      </el-card>
    </el-timeline-item>
  </el-timeline>
</div>
```
:::

### Timeline-item Attributes
| 参数      | 说明    | 类型      | 可选值       | 默认值   |
|---------- |-------- |---------- |-------------  |-------- |
| timestamp     | 时间戳 | string  | - | — |
| hide-timestamp  | 是否隐藏时间戳 | boolean | — | false |
| placement | 时间戳位置 | string | top / bottom | bottom |
| type | 节点类型 | string | primary / success / warning / danger / info | - |
| color | 节点颜色 | string | hsl / hsv / hex / rgb | - |
| size | 节点尺寸 | string | normal / large | normal |
| icon | 节点图标 | string | — | - |

### Timeline-Item Slot
| name | 说明 |
|------|--------|
| — | Timeline-Item 的内容 |
| dot | 自定义节点 |