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24 lines
653 B
24 lines
653 B
9 years ago
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---
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category: Components
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chinese: 置顶
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type: Other
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english: BackTop
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---
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使用 `BackTop` 可以方便地回到顶部。
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## 何时使用
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当内容区域比较长，需要提供快速回到顶部的功能时。
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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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> 自定义样式宽高有限制，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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