Angular如何获取参数名？

import { ActivatedRoute } from '@angular/router';

constructor(private route: ActivatedRoute) {}

ngOnInit() {
  this.route.paramMap.subscribe(params => {
    // 获取参数名
    const paramName = params.keys[0];
    console.log(paramName);
  });
}

import { ActivatedRoute } from '@angular/router';

constructor(private route: ActivatedRoute) {}

ngOnInit() {
  this.route.queryParams.subscribe(params => {
    // 获取参数名
    const paramName = Object.keys(params)[0];
    console.log(paramName);
  });
}

import { Component, ViewChild } from '@angular/core';
import { ChildComponent } from './child.component';

@Component({
  selector: 'app-parent',
  template: `
    <app-child [paramName]="'example'"></app-child>
  `
})
export class ParentComponent {
  @ViewChild(ChildComponent) childComponent: ChildComponent;

  ngAfterViewInit() {
    // 获取参数名
    const paramName = this.childComponent.paramName;
    console.log(paramName);
  }
}