角柱方法无法正常工作

Question

在此POST方法中，我正在执行console.log( 'value:- '+ this.newCourses);时正在发布数据这里对象对象来了，这里我发布的值不打印

{  new course data saved succcesfully , 
   this.token ... [object Object] ,
   value:- [object Object]     } 



postData(){
         this.token = getToken();

        this.details['title'] = this.form.getRawValue();
        this.details['category'] = this.form.getRawValue();
        this.details['length'] = this.form.getRawValue();
        this.details['content'] = this.form.getRawValue();
        this.details['product_name'] =  getProduct()['name'];
        this.details['updated'] = 'Monday';
         console.log(this.details);

          this.httpHeaders = new HttpHeaders({
          "Authorization": "Bearer " + this.token});
          this._httpClient.post('http://127.0.0.1:8000/api/products/add-course/',this.details, {headers: this.httpHeaders}).subscribe(
                                result => {
                              console.log(result); 
                                   console.log("new course data saved succcesfully");                       
                                   this.token = getToken();
                                   this.newCourses = result;
                                   console.log( 'value:- '+ this.newCourses);

                                },
                               error => {
                               console.log(error);
                                }
                            );

     }

Answer 1

您只看到将对象连接到字符串的结果。

如果要记录对象本身，请分别记录字符串和对象：

console.log('value:- ', this.newCourses);

注意，我在这里将2个参数传递给console.log。

当连接对象和字符串时，将调用对象的toString()方法。默认情况下，它将显示[object Object]。

const obj = { a: 1, b: 2, c: 3 };
   
// concatenate obj with string
console.log('value: - ' + obj);
   
// log string and object itself as separate args
console.log('value: - ', obj);

// log obj.toString()
const objString = obj.toString();
console.log(objString);

奖金编辑：

如果需要，您可以覆盖toString()：

// override toString()
const obj = { a: 1, b: 2, c: 3, toString: () => 'World!' };
console.log('Hello, ' + obj);

Answer 2

`const headers = new HttpHeaders().set(
  "security-token",
  localStorage.getItem("token")
);

const httpOptions = {
  headers: headers,
  observe: 'response' as 'response',
  params: data
};

return this.http
  .get<any>("/url/", httpOptions)
  .pipe(
    map(response => {
      return response
    }),
    catchError(this.handleError)
);`