vuejs中的多个嵌套下拉菜单

<template>
  <div>
    <select v-model="selectedOption1" @change="handleOption1Change">
      <option value="">请选择</option>
      <option v-for="option in options1" :value="option.value">{{ option.label }}</option>
    </select>
    <select v-model="selectedOption2" @change="handleOption2Change">
      <option value="">请选择</option>
      <option v-for="option in options2" :value="option.value">{{ option.label }}</option>
    </select>
    <select v-model="selectedOption3">
      <option value="">请选择</option>
      <option v-for="option in options3" :value="option.value">{{ option.label }}</option>
    </select>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedOption1: '',
      selectedOption2: '',
      selectedOption3: '',
      options1: [
        { label: '选项1-1', value: '1-1' },
        { label: '选项1-2', value: '1-2' },
      ],
      options2: [],
      options3: [],
    };
  },
  methods: {
    handleOption1Change() {
      // 根据选中的第一级菜单选项，动态生成第二级菜单选项
      if (this.selectedOption1 === '1-1') {
        this.options2 = [
          { label: '选项2-1', value: '2-1' },
          { label: '选项2-2', value: '2-2' },
        ];
      } else if (this.selectedOption1 === '1-2') {
        this.options2 = [
          { label: '选项2-3', value: '2-3' },
          { label: '选项2-4', value: '2-4' },
        ];
      } else {
        this.options2 = [];
      }
      this.selectedOption2 = '';
      this.options3 = [];
      this.selectedOption3 = '';
    },
    handleOption2Change() {
      // 根据选中的第二级菜单选项，动态生成第三级菜单选项
      if (this.selectedOption2 === '2-1') {
        this.options3 = [
          { label: '选项3-1', value: '3-1' },
          { label: '选项3-2', value: '3-2' },
        ];
      } else if (this.selectedOption2 === '2-2') {
        this.options3 = [
          { label: '选项3-3', value: '3-3' },
          { label: '选项3-4', value: '3-4' },
        ];
      } else if (this.selectedOption2 === '2-3') {
        this.options3 = [
          { label: '选项3-5', value: '3-5' },
          { label: '选项3-6', value: '3-6' },
        ];
      } else if (this.selectedOption2 === '2-4') {
        this.options3 = [
          { label: '选项3-7', value: '3-7' },
          { label: '选项3-8', value: '3-8' },
        ];
      } else {
        this.options3 = [];
      }
      this.selectedOption3 = '';
    },
  },
};
</script>