我得到的例外:没有提供Http!我做错了什么?
import {Http, Headers} from 'angular2/http';
import {Injectable} from 'angular2/core'
@Component({
selector: 'greetings-ac-app2',
providers: [],
templateUrl: 'app/greetings-ac2.html',
directives: [NgFor, NgModel, NgIf, FORM_DIRECTIVES],
pipes: []
})
export class GreetingsAcApp2 {
private str:any;
constructor(http: Http) {
this.str = {str:'test'};
http.post('http://localhost:18937/account/registeruiduser/',
JSON.stringify(this.str),
{
headers: new Headers({
'Content-Type': 'application/json'
})
});
>= Angular 4.3
用于引入的HttpClientModule
import { HttpClientModule } from '@angular/common/http';
@NgModule({
imports: [
BrowserModule,
FormsModule, // if used
HttpClientModule,
JsonpModule // if used
],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
Angular2 >= RC.5
将HttpModule导入到你使用它的模块中(例如AppModule):
import { HttpModule } from '@angular/http';
@NgModule({
imports: [
BrowserModule,
FormsModule, // if used
HttpModule,
JsonpModule // if used
],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
导入HttpModule非常类似于在以前的版本中添加HTTP_PROVIDERS。
最好的方法是通过在providers数组中添加Http来更改组件的装饰器，如下所示。
@Component({
selector: 'greetings-ac-app2',
providers: [Http],
templateUrl: 'app/greetings-ac2.html',
directives: [NgFor, NgModel, NgIf, FORM_DIRECTIVES],
pipes: []
})
在app.module.ts文件中导入HttpModule。
import { HttpModule } from '@angular/http';
import { YourHttpTestService } from '../services/httpTestService';
还记得在import下面声明HttpModule，如下所示:
imports: [
BrowserModule,
HttpModule
],
