Detailed explanation of Angular HttpClient usage

This time I will bring you a detailed explanation of the use of Angular HttpClient, what are the precautions when using Angular HttpClient, the following is a practical case, let's take a look.

The HttpClient class in @angular/common/http provides a simplified API for Angular applications to implement HTTP client functions

1. Preparation Working

First import HttpClientModule in app.module.ts. As follows:

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

2. Introduce HttpClient into service.ts that requires to reference HttpClient, as follows:

import { HttpClient } from '@angular/common/http';
export class ConfigService {
 constructor(private http: HttpClient) { }
}

##3. Request data

return this.http.get/post(url:'请求地址' ,
  options: {
   headers: this.headers
  })
   .toPromise()
   .then((data: any) => {
    return data;
   })
   .catch((err) => {
    console.log(err);
   });
 }

4. Introduce service into the corresponding component.ts file

##Data format:

{
  "lists":[
    {"title":"","pic":""},
    {"title":"","pic":""}
  ]
}

5. Call on the page

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to the php Chinese website Other related articles!

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