---
category: Components
type: Navigation
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
-----|-----|-----|------
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 | -