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uni_modules/wot-design-uni/components/wd-backtop/index.scss

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+@import '../common/abstracts/variable';
+@import '../common/abstracts/mixin';
+
+@include b(backtop) {
+  position: fixed;
+  background-color: $-backtop-bg;
+  width: 40px;
+  height: 40px;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  color: $-color-gray-8;
+
+  @include edeep(backicon) {
+    font-size: $-backtop-icon-size;
+  }
+
+  @include when(circle) {
+    border-radius: 50%;
+  }
+
+  @include when(square) {
+    border-radius: 4px;
+  }
+}

uni_modules/wot-design-uni/components/wd-backtop/types.ts

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+import { baseProps, makeNumberProp, makeRequiredProp, makeStringProp } from '../common/props'
+
+export const backtopProps = {
+  ...baseProps,
+  /**
+   * 页面滚动距离
+   */
+  scrollTop: makeRequiredProp(Number),
+  /**
+   * 距离顶部多少距离时显示
+   */
+  top: makeNumberProp(300),
+  /**
+   * 返回顶部滚动时间
+   */
+  duration: makeNumberProp(100),
+  /**
+   * 层级
+   */
+  zIndex: makeNumberProp(10),
+  /**
+   * icon样式
+   */
+  iconStyle: makeStringProp(''),
+  /**
+   * 形状
+   */
+  shape: makeStringProp('circle'),
+  /**
+   * 距离屏幕底部距离
+   */
+  bottom: makeNumberProp(100),
+  /**
+   * 距离屏幕右边距离
+   */
+  right: makeNumberProp(20)
+}

uni_modules/wot-design-uni/components/wd-backtop/wd-backtop.vue

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+<template>
+  <wd-transition :show="show" name="fade">
+    <view
+      :class="`wd-backtop ${customClass} is-${shape}`"
+      :style="`z-index: ${zIndex}; bottom: ${bottom}px; right: ${right}px; ${customStyle}`"
+      @click="handleBacktop"
+    >
+      <slot v-if="$slots.default"></slot>
+      <wd-icon v-else custom-class="wd-backtop__backicon" name="backtop" :custom-style="iconStyle" />
+    </view>
+  </wd-transition>
+</template>
+
+<script lang="ts">
+export default {
+  name: 'wd-backtop',
+  options: {
+    addGlobalClass: true,
+    virtualHost: true,
+    styleIsolation: 'shared'
+  }
+}
+</script>
+
+<script lang="ts" setup>
+import wdTransition from '../wd-transition/wd-transition.vue'
+import wdIcon from '../wd-icon/wd-icon.vue'
+import { computed } from 'vue'
+import { backtopProps } from './types'
+
+const props = defineProps(backtopProps)
+
+const show = computed(() => props.scrollTop > props.top)
+
+function handleBacktop() {
+  uni.pageScrollTo({
+    scrollTop: 0,
+    duration: props.duration
+  })
+}
+</script>
+
+<style lang="scss" scoped>
+@import './index.scss';
+</style>