72 lines
3.0 KiB
Markdown
72 lines
3.0 KiB
Markdown
---
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title: BackTop 返回顶部
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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。
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spline: navigation
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isComponent: true
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---
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<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>
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## 引入
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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。
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```json
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"usingComponents": {
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"t-back-top": "tdesign-miniprogram/back-top/back-top",
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}
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```
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## 代码演示
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<a href="https://developers.weixin.qq.com/s/2aR1demj7aS2" title="在开发者工具中预览效果" target="_blank" rel="noopener noreferrer"> 在开发者工具中预览效果 </a>
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<blockquote style="background-color: #d9e1ff; font-size: 15px; line-height: 26px;margin: 16px 0 0;padding: 16px; border-radius: 6px; color: #0052d9" >
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<p>Tips: 请确保开发者工具为打开状态。导入开发者工具后，依次执行：npm i > 构建npm包 > 勾选 "将JS编译成ES5"</p>
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</blockquote>
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<img src="https://tdesign.gtimg.com/miniprogram/readme/backtop-1.png" width="375px" height="50%">
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### 基础返回顶部
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{{ base }}
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## API
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### BackTop Props
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名称 | 类型 | 默认值 | 描述 | 必传
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-- | -- | -- | -- | --
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style | Object | - | 样式 | N
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custom-style | Object | - | 样式，一般用于开启虚拟化组件节点场景 | N
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fixed | Boolean | true | 是否绝对定位固定到屏幕右下方 | N
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icon | String / Boolean / Object / Slot | true | 图标。值为 `false` 表示不显示图标。不传表示使用默认图标 `'backtop'`。[通用类型定义](https://github.com/Tencent/tdesign-miniprogram/blob/develop/src/common/common.ts) | N
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scroll-top | Number | 0 | 页面滚动距离 | N
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text | String | '' | 文案 | N
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theme | String | round | 预设的样式类型。可选项：round/half-round/round-dark/half-round-dark | N
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visibility-height | Number | 200 | 滚动高度达到此参数值才出现 | N
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### BackTop Events
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名称 | 参数 | 描述
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-- | -- | --
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to-top | \- | 点击触发
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### BackTop External Classes
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类名 | 描述
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-- | --
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t-class | 根节点样式类
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t-class-icon | 图标样式类
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t-class-text | 文本样式类
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### CSS Variables
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组件提供了下列 CSS 变量，可用于自定义样式。
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名称 | 默认值 | 描述
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-- | -- | --
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--td-back-top-round-bg-color | @font-white-1 | -
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--td-back-top-round-border-color | @component-border | -
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--td-back-top-round-border-radius | @radius-circle | -
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--td-back-top-round-color | @font-gray-1 | -
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--td-back-top-round-dark-bg-color | @gray-color-14 | -
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--td-back-top-round-dark-color | @font-white-1 | - |