project init & fix ui
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miniprogram_npm/tdesign-miniprogram/back-top/README.md
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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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<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 | 说明 | 必传
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-- | -- | -- | -- | --
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custom-style `v0.25.0` | String | - | 自定义组件样式 | N
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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
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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,值为 `'slot'` 表示使用插槽。不传表示使用默认图标 `'backtop'` | 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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### 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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