您可以使用以下解决方案（将observable转换为promise并添加async/await）：

async TesteToken(): Promise<Something> {
    return this.http.get<any>(`${this.url}/token`).toPromise();
}

let token = await  this.TesteToken();

问题：您试图返回异步响应，就像返回同步响应一样。

TesteToken() : any { // this does not return anything since function ends before a value is returned.
    let token;
    this.http.get<any>(`${this.url}/token`).subscribe(res => {
      token = res;
      return token;  // does nothing
    });
}

修复：订阅要设置值的位置。

TestToken() : Observable<any> { // you can set the type of any
return this.http.get<any>(`${this.url}/token`);
}

访问该值;

// code runs
    this.TestToken().Subscribe((value) => { 
// code runs after value has returned from server
console.log(value); 
})
// code outside subscribe runs first without waiting.