filters获取data中的数据

<template>
  <div>
    <p>{{ 9 | getNum }}</p>
  </div>
</template>

<script>
import { WOW } from "wowjs";
import countTo from "vue-count-to";
let that;
export default {
  data() {
    return {
      arr: [1, 2, 3, 4, 5, 6, 7],
    };
  },

  beforeCreate() {
    that = this;
  },

  filters: {
    // 方式1  this.arr无法获取
    getNum(res) {
      let newRes ;
    newRes =   that.arr.some((item) => {
        return item == res
        console.log(item == res);
       
      });
      return newRes ? "Yes" :"No";
    },
  },
  mounted() {},

  created() {},
};
</script>
<style>
</style>