更新：登录功能

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>