如何在Vue.js中访问经过筛选的数组计算值？

data() {
  return {
    numbers: [1, 2, 3, 4, 5],
    evenNumbers: []
  };
},
computed: {
  filteredNumbers() {
    this.evenNumbers = this.numbers.filter(number => number % 2 === 0);
    return this.evenNumbers;
  },
  sumOfFilteredNumbers() {
    return this.filteredNumbers.reduce((a, b) => a + b, 0);
  }
}

data() {
  return {
    numbers: [1, 2, 3, 4, 5]
  };
},
filters: {
  filterEvenNumbers(numbers) {
    return numbers.filter(number => number % 2 === 0);
  },
  calculateSum(numbers) {
    return numbers.reduce((a, b) => a + b, 0);
  }
}