Angular 6-使用Wait for http客户端，如果失败，如何获取状态代码

假设我让response=await this.http.postrl、list.toPromise，那么在仍然使用await的情况下，是否有任何方法可以获取状态代码，例如200、404等等。谢谢

为此，您必须使用一个try-and-catch块。您将在catch块中获得错误

catch块将获得HttpErrorResponse类型的实例，该实例上有一个status属性

大概是这样的：

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/13').toPromise();
      console.log(response);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/1', { observe: 'response' }).toPromise();
      console.log('Response Status: ', response.status);
      console.log('Response Body: ', response.body);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

更新： 由于您使用的是HttpClient，而没有观察到“响应”，因此您只能在得到的响应中获得响应负载数据。如果您还需要它的状态，那么必须将其作为一个httpOption{observe:'response'}进行paas。大概是这样的：

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/13').toPromise();
      console.log(response);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/1', { observe: 'response' }).toPromise();
      console.log('Response Status: ', response.status);
      console.log('Response Body: ', response.body);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

这是你的参考资料的更新

你将不得不使用一个尝试和捕捉块。您将在catch块中获得错误

catch块将获得HttpErrorResponse类型的实例，该实例上有一个status属性

大概是这样的：

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/13').toPromise();
      console.log(response);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/1', { observe: 'response' }).toPromise();
      console.log('Response Status: ', response.status);
      console.log('Response Body: ', response.body);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

更新： 由于您使用的是HttpClient，而没有观察到“响应”，因此您只能在得到的响应中获得响应负载数据。如果您还需要它的状态，那么必须将其作为一个httpOption{observe:'response'}进行paas。大概是这样的：

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/13').toPromise();
      console.log(response);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular';

  constructor(private http: HttpClient) {}

  async ngOnInit () {
    try {
      const response = await this.http.get('https://jsonplaceholder.typicode.com/users/1', { observe: 'response' }).toPromise();
      console.log('Response Status: ', response.status);
      console.log('Response Body: ', response.body);
    } catch(error) {
      console.log('Error Status: ', error.status);
    }
  }

}

这是你的参考资料的更新

---

您应该使用自定义请求HttpClient.request而不是post来获取响应代码您应该使用自定义请求HttpClient.request而不是post来获取响应代码Hanks SiddAjmera，看起来很棒。还有一个问题。如何区分200和201？谢谢我试图获取response.status，但未定义。谢谢lot@Ben，因为您使用的是HttpClient，而没有观察到响应，所以您只能在得到的响应中获得响应负载数据。如果您还需要它的状态，那么必须将其作为一个httpOption{observe:'response'}进行paas。让我为你更新答案。谢谢，@SiddAjmera，你的答案很有帮助。谢谢SiddAjmera，看起来很棒。还有一个问题。如何区分200和201？谢谢我试图获取response.status，但未定义。谢谢lot@Ben，因为您使用的是HttpClient，而没有观察到响应，所以您只能在得到的响应中获得响应负载数据。如果您还需要它的状态，那么必须将其作为一个httpOption{observe:'response'}进行paas。让我为你更新答案。谢谢，@SiddAjmera，你的答案帮助很大。