如何在具有多个过滤器的v-data-table中选择默认值

<template>
  <v-data-table
    :headers="headers"
    :items="items"
    :search="search"
    :pagination.sync="pagination"
    :loading="loading"
    :rows-per-page-items="[10, 20, 30]"
    class="elevation-1"
  >
    <template v-slot:top>
      <v-toolbar flat>
        <v-toolbar-title>Filter by:</v-toolbar-title>
        <v-select
          v-model="filter1"
          :items="filter1Options"
          label="Filter 1"
        ></v-select>
        <v-select
          v-model="filter2"
          :items="filter2Options"
          label="Filter 2"
        ></v-select>
      </v-toolbar>
    </template>
  </v-data-table>
</template>

<script>
export default {
  data() {
    return {
      headers: [...],
      items: [...],
      search: '',
      pagination: {},
      loading: false,
      filter1: '',
      filter2: '',
      filter1Options: [...],
      filter2Options: [...],
    };
  },
  computed: {
    filteredItems() {
      // Apply filters to items based on filter1 and filter2 values
      // Return filtered items
    },
  },
  watch: {
    filter1(newVal) {
      // Update filteredItems based on new value of filter1
    },
    filter2(newVal) {
      // Update filteredItems based on new value of filter2
    },
  },
};
</script>