创建service.module.ts

import { NgModule, ModuleWithProviders } from '@angular/core';import { SomeSharedService } from './global.service';export {  SomeSharedService}@NgModule()export class ServicesModule {   static forRoot():ModuleWithProviders{    return {      ngModule:ServicesModule,      providers:[SomeSharedService]    }  }}

新建global.service.ts

import { Injectable } from '@angular/core'import { BehaviorSubject } from 'rxjs';@Injectable()export class SomeSharedService {  public globalVar:BehaviorSubject
     
       = new BehaviorSubject([]);  public pageLimit = 10;}
     

在组件1中引入服务并获取值

...import { SomeSharedService } from 'src/app/services/global.service';.....  constructor(    private someSharedService: SomeSharedService  ) {   }  ngOnInit() {    this.someSharedService.globalVar.subscribe(d=>{      this.clumb = d;    })  }....}

在组件2中引入服务并设置值

import { SomeSharedService } from 'src/app/services/global.service';.......  constructor(    private someSharedService$:SomeSharedService  ) {}   getProjectName(id:Number){    this.someSharedService$.globalVar.next(['我的项目',{id:id,name:res.data.project_name}]  }....}

这里设置了新的值，在组件1订阅 到改变后的值。