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## API
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| 成员 | 说明 | 类型 | 默认值 | 版本 |
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| --- | --- | --- | --- | --- |
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| offsetBottom | 距离窗口底部达到指定偏移量后触发 | number | | |
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| offsetTop | 距离窗口顶部达到指定偏移量后触发 | number | | |
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| target | 设置 `Affix` 需要监听其滚动事件的元素，值为一个返回对应 DOM 元素的函数 | () => HTMLElement | () => window | |
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### 事件
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| 事件名称 | 说明 | 回调参数 | 版本 |
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| -------- | ---------------------------- | ----------------- | ---- |
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| change | 固定状态改变时触发的回调函数 | Function(affixed) | 无 | |
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**注意：**`Affix` 内的元素不要使用绝对定位，如需要绝对定位的效果，可以直接设置 `Affix` 为绝对定位：
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```html
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<a-affix :style="{ position: 'absolute', top: y, left: x}">
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...
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</a-affix>
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```
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## FAQ
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### Affix 使用 `target` 绑定容器时，元素会跑到容器外。
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从性能角度考虑，我们只监听容器滚动事件。
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相关 issue：[#3938](https://github.com/ant-design/ant-design/issues/3938) [#5642](https://github.com/ant-design/ant-design/issues/5642) [#16120](https://github.com/ant-design/ant-design/issues/16120)
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