Angular 2.调用组件并获取参数仅有效一次

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
  paramValue: string;

  constructor(private route: ActivatedRoute) {}

  ngOnInit() {
    this.route.params.subscribe(params => {
      this.paramValue = params['paramName']; // 确保这里的paramName与路由定义一致
    });
  }
}

import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private dataSubject = new BehaviorSubject<any>(null);
  data$ = this.dataSubject.asObservable();

  setData(data: any) {
    this.dataSubject.next(data);
  }
}

import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
  data: any;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.data$.subscribe(data => {
      this.data = data;
    });
  }
}