在Angular中,可以使用模块联邦来解决模块间的初始化和数据共享问题。模块联邦允许多个Angular应用程序共享模块,组件和服务。
以下是一个解决方法的示例:
app.module.ts:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { SharedModule } from './shared/shared.module';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
SharedModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
shared.module.ts:
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SharedComponent } from './shared.component';
import { SharedDataService } from './shared-data.service';
@NgModule({
declarations: [
SharedComponent
],
imports: [
CommonModule
],
exports: [
SharedComponent
],
providers: [
SharedDataService
]
})
export class SharedModule { }
shared.component.ts:
import { Component, OnInit } from '@angular/core';
import { SharedDataService } from './shared-data.service';
@Component({
selector: 'app-shared',
template: `
{{ sharedData }}
`
})
export class SharedComponent implements OnInit {
sharedData: string;
constructor(private sharedDataService: SharedDataService) { }
ngOnInit(): void {
this.sharedData = this.sharedDataService.getData();
}
}
shared-data.service.ts:
import { Injectable } from '@angular/core';
@Injectable()
export class SharedDataService {
private data: string = 'Shared data';
getData(): string {
return this.data;
}
}
app.module.ts:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { SharedModule } from 'main-app/shared/shared.module';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
SharedModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
forRoot
方法来导出共享模块的服务。这样可以确保服务在整个应用程序中是单例的。shared.module.ts:
import { NgModule, ModuleWithProviders } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SharedComponent } from './shared.component';
import { SharedDataService } from './shared-data.service';
@NgModule({
declarations: [
SharedComponent
],
imports: [
CommonModule
],
exports: [
SharedComponent
]
})
export class SharedModule {
static forRoot(): ModuleWithProviders {
return {
ngModule: SharedModule,
providers: [
SharedDataService
]
};
}
}
forRoot
方法来导出服务。app.module.ts:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { SharedModule } from './shared/shared.module';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
SharedModule.forRoot()
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
这样,子应用程序就可以通过导入共享模块来使用主应用程序的模块、组件和服务。
请注意,上述示例只是一个简单的示例,你可以根据自己的需求进行调整和扩展。