New Huajishe Check ChaoXing

HuajisheCheckChaoXing/miniprogram_npm/tdesign-miniprogram/back-top/README.en-US.md

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+:: BASE_DOC ::
+
+## API
+
+### BackTop Props
+
+name | type | default | description | required
+-- | -- | -- | -- | --
+style | Object | - | CSS(Cascading Style Sheets) | N
+custom-style | Object | - | CSS(Cascading Style Sheets)，used to set style on virtual component | N
+fixed | Boolean | true | \- | N
+icon | String / Boolean / Object / Slot | true | [see more ts definition](https://github.com/Tencent/tdesign-miniprogram/blob/develop/src/common/common.ts) | N
+scroll-top | Number | 0 | \- | N
+text | String | '' | \- | N
+theme | String | round | options: round/half-round/round-dark/half-round-dark | N
+visibility-height | Number | 200 | \- | N
+
+### BackTop Events
+
+name | params | description
+-- | -- | --
+to-top | \- | \-
+### BackTop External Classes
+
+className | Description
+-- | --
+t-class | \-
+t-class-icon | \-
+t-class-text | \-
+
+### CSS Variables
+
+The component provides the following CSS variables, which can be used to customize styles.
+Name | Default Value | Description 
+-- | -- | --
+--td-back-top-round-bg-color | @font-white-1 | - 
+--td-back-top-round-border-color | @component-border | - 
+--td-back-top-round-border-radius | @radius-circle | - 
+--td-back-top-round-color | @font-gray-1 | - 
+--td-back-top-round-dark-bg-color | @gray-color-14 | - 
+--td-back-top-round-dark-color | @font-white-1 | -