如何在Angular 2+ (无ngClass)中添加和删除动态创建的元素中的类？

import { Component, Renderer2, ElementRef } from '@angular/core';

constructor(private renderer: Renderer2, private el: ElementRef) { }

createDynamicElement() {
  const div = this.renderer.createElement('div');
  const text = this.renderer.createText('Dynamic Element');
  
  this.renderer.appendChild(div, text);
  this.renderer.addClass(div, 'custom-class');
  
  const container = this.el.nativeElement.querySelector('.container');
  this.renderer.appendChild(container, div);
}

removeDynamicElementClass() {
  const div = this.el.nativeElement.querySelector('.container div');
  this.renderer.removeClass(div, 'custom-class');
}