初始化项目，自 v1.7.1 版本开始

src/layout/components/SizeDropdown/index.ts

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+import SizeDropdown from './src/SizeDropdown.vue'
+
+export { SizeDropdown }

src/layout/components/SizeDropdown/src/SizeDropdown.vue

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+<script setup lang="ts">
+import { useAppStore } from '@/store/modules/app'
+
+import { propTypes } from '@/utils/propTypes'
+import { useDesign } from '@/hooks/web/useDesign'
+import { ElementPlusSize } from '@/types/elementPlus'
+
+const { getPrefixCls } = useDesign()
+
+const prefixCls = getPrefixCls('size-dropdown')
+
+defineProps({
+  color: propTypes.string.def('')
+})
+
+const { t } = useI18n()
+
+const appStore = useAppStore()
+
+const sizeMap = computed(() => appStore.sizeMap)
+
+const setCurrentSize = (size: ElementPlusSize) => {
+  appStore.setCurrentSize(size)
+}
+</script>
+
+<template>
+  <ElDropdown :class="prefixCls" trigger="click" @command="setCurrentSize">
+    <Icon :size="18" icon="mdi:format-size" :color="color" class="cursor-pointer" />
+    <template #dropdown>
+      <ElDropdownMenu>
+        <ElDropdownItem v-for="item in sizeMap" :key="item" :command="item">
+          {{ t(`size.${item}`) }}
+        </ElDropdownItem>
+      </ElDropdownMenu>
+    </template>
+  </ElDropdown>
+</template>