project init & fix ui

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2023-01-06 14:24:11 +08:00
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---
title: BackTop 返回顶部
description: 用于当页面过长往下滑动时,帮助用户快速回到页面顶部。
spline: navigation
isComponent: true
---
<span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20lines-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20functions-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20statements-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20branches-100%25-blue" /></span>
## 引入
全局引入,在 miniprogram 根目录下的`app.json`中配置,局部引入,在需要引入的页面或组件的`index.json`中配置。
```json
"usingComponents": {
"t-back-top": "tdesign-miniprogram/back-top/back-top",
}
```
## 代码演示
<img src="https://tdesign.gtimg.com/miniprogram/readme/backtop-1.png" width="375px" height="50%">
### 基础返回顶部
{{ base }}
## API
### BackTop Props
名称 | 类型 | 默认值 | 说明 | 必传
-- | -- | -- | -- | --
custom-style `v0.25.0` | String | - | 自定义组件样式 | N
external-classes | Array | - | 组件类名,分别用于设置外层元素、图标、文本内容等元素类名。`['t-class', 't-class-icon', 't-class-text']` | N
fixed | Boolean | true | 是否绝对定位固定到屏幕右下方 | N
icon | String / Boolean / Object / Slot | true | 图标。值为 `false` 表示不显示图标,值为 `'slot'` 表示使用插槽。不传表示使用默认图标 `'backtop'` | N
text | String | '' | 文案 | N
theme | String | round | 预设的样式类型。可选项round/half-round/round-dark/half-round-dark | N
### BackTop Events
名称 | 参数 | 描述
-- | -- | --
to-top | \- | 点击触发