angular - 类型 'get' 上不存在属性 'HttpClientModule'

Question

我是 Angular js 的新手，试图从 youtube 学习它，但我在我的代码中遇到了提到的问题
，我不明白我的代码中缺少什么

错误

当我尝试访问 HttpClientModule 的获取服务时出现“属性‘get’在类型‘HttpClientModule’上不存在”错误。,
下面是详细代码
app.component.ts 文件是

import { Component,OnInit  } from '@angular/core';
   import {HttpClientModule} from '@angular/common/http';
     @Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
   })
   export class AppComponent {

   constructor(private http:HttpClientModule){};
   title = 'app';
   ngOnInit() {
   this.http.get('https://my-json-server.typicode.com/techsithgit/json-faker-
   directory/profiles').
    subscribe((data)=>{
      console.log(data);
    });

   }

}

app.module.ts 文件是

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {HttpClientModule} from '@angular/common/http';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Package.json 文件是

{
  "name": "trust",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.0.2",
    "@angular/common": "^5.0.2",
    "@angular/compiler": "^5.0.2",
    "@angular/compiler-cli": "^5.0.2",
    "@angular/core": "^5.0.2",
    "@angular/forms": "^5.0.2",
    "@angular/http": "^5.0.2",
    "@angular/platform-browser": "^5.0.2",
    "@angular/platform-browser-dynamic": "^5.0.2",
    "@angular/platform-server": "^5.0.2",
    "@angular/router": "^5.0.2",
    "core-js": "^2.4.1",
    "rxjs": "^5.4.2",
    "typescript": "^2.6.1",
    "zone.js": "^0.8.18"
  },
  "devDependencies": {
    "@angular/cli": "1.4.9",
    "@angular/compiler-cli": "^4.2.4",
    "@angular/language-service": "^4.2.4",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "~3.2.0",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~2.3.3"
  }
}

Answer 1

您需要使用 HttpClient 而不是 HttpClientModule 来发出 http 请求。

在 app.module.ts 中，导入 HttpClientModule(参见下面的“导入”):

import { HttpClientModule } from '@angular/common/http';
@NgModule({
    imports: [
          HttpClientModule,
    ...
    ],
    ...
})
export class AppModule { }

然后，在app.component.ts中导入HttpClient:

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

现在，将您的 AppComponent Ctor 从

constructor(private http: HttpClientModule){};

到

constructor(private http: HttpClient){};