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---
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category: Components
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type: Navigation
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subtitle: 回到顶部
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title: BackTop
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---
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返回页面顶部的操作按钮。
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## 何时使用
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- 当页面内容区域比较长时；
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- 当用户需要频繁返回顶部查看相关内容时。
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## API
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> 有默认样式，距离底部 `50px`，可覆盖。
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> 自定义样式宽高不大于 40px * 40px。
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| 参数 | 说明 | 类型 | 默认值 |
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|-------------|----------------|--------------------|--------------|
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| visibilityHeight | 滚动高度达到此参数值才出现 `BackTop` | number | 400 |
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| onClick | 点击按钮的回调函数 | Function | - |
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| target | 设置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 | Function | () => window |
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