方法一

// mixins.ts

import { Vue } from "vue-property-decorator";

export class TableSelect extends Vue {
    selected: Array<any> = [];

    tableChange(val: Array<any>) {
        this.selected = val;
    }
}

// pagea.vue
import { Component } from "vue-property-decorator";
import {TableSelect } from 'mixins'

@Component
export default class Hone extends TableSelect {
  // do something   
}