angular 6中的url中缺少查询参数

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

constructor(private router: Router) { }

// 导航到具有查询参数的URL
this.router.navigate(['/path'], { queryParams: { key1: 'value1', key2: 'value2' }});

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

constructor(private route: ActivatedRoute) { }

// 获取查询参数
const queryParams = this.route.snapshot.queryParams;

import { HttpClient, HttpParams } from '@angular/common/http';

constructor(private http: HttpClient) { }

// 发送带有查询参数的GET请求
const params = new HttpParams().set('key1', 'value1').set('key2', 'value2');
this.http.get('/api', { params: params }).subscribe(response => {
    // 处理响应
});