如何检查v-select是否选择了元素

<template>
  <div>
    <v-select v-model="selectedItem" :options="items"></v-select>
    <button @click="checkSelection">检查选择</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedItem: null,
      items: [
        { value: '1', label: '选项1' },
        { value: '2', label: '选项2' },
        { value: '3', label: '选项3' }
      ]
    };
  },
  methods: {
    checkSelection() {
      if (this.selectedItem) {
        console.log('已选择元素:', this.selectedItem);
      } else {
        console.log('未选择元素');
      }
    }
  }
};
</script>