派生并子类化一个指令，这样ContentChildren就可以找到它？

import { Directive } from '@angular/core';
import { ExistingDirective } from '@angular/common';

@Directive({
  selector: '[appCustomDirective]'
})
export class CustomDirective extends ExistingDirective {
  // 添加自定义的行为和属性
}

import { Component, ContentChildren, QueryList } from '@angular/core';
import { CustomDirective } from './custom.directive';

@Component({
  selector: 'app-parent',
  template: `
    <div appCustomDirective></div>
    <div appCustomDirective></div>
  `
})
export class ParentComponent {
  @ContentChildren(CustomDirective) customDirectives: QueryList<CustomDirective>;

  ngAfterContentInit() {
    console.log(this.customDirectives); // 输出匹配的自定义指令实例
  }
}