init

src/components/SizeSelect/index.vue

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+<template>
+  <div>
+    <el-dropdown trigger="click" @command="handleSetSize">
+      <div class="size-icon--style">
+        <svg-icon class-name="size-icon" icon-class="size" />
+      </div>
+      <template #dropdown>
+        <el-dropdown-menu>
+          <el-dropdown-item v-for="item of sizeOptions" :key="item.value" :disabled="size === item.value" :command="item.value">
+            {{ item.label }}
+          </el-dropdown-item>
+        </el-dropdown-menu>
+      </template>
+    </el-dropdown>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { useAppStore } from '@/store/modules/app';
+
+const appStore = useAppStore();
+const size = computed(() => appStore.size);
+
+const sizeOptions = ref([
+  { label: '较大', value: 'large' },
+  { label: '默认', value: 'default' },
+  { label: '稍小', value: 'small' }
+]);
+
+const handleSetSize = (size: 'large' | 'default' | 'small') => {
+  appStore.setSize(size);
+};
+</script>
+
+<style lang="scss" scoped>
+.size-icon--style {
+  font-size: 18px;
+  line-height: 50px;
+  padding-right: 7px;
+}
+</style>