---
category: Components
type: Other
title: BackTop
---

`BackTop` makes it easy to go back to the top of the page.

## When To Use

- When the page content is very long.
- When you need to go back to the top very frequently in order to view the contents.

## API

> The distance to the bottom is set to `50px` by default, which is overridable.
>
> If you decide to use custom styles, please note the size limit: no more than `40px * 40px`.

| Property | Description | Type | Default |
| --- | --- | --- | --- |
| target | specifies the scrollable area dom node | () => HTMLElement | () => window |
| visibilityHeight | the `BackTop` button will not show until the scroll height reaches this value | number | 400 |
| onClick | a callback function, which can be executed when you click the button | Function | - |