属性 then does not exist on type void ，打字稿错误

Question

代码：

 reset(){
  let alert = this.AlertCtrl.create({
    buttons :['ok']
  });
  this.userservice.passwordreset(this.email).then((res: any)=>{
    if(res.success){
      alert.setTitle('Email sent');
      alert.setSubTitle('please follow the instructions in the email to reset the password')

    }
    else{
      alert.setTitle('failed');
    }
  })
}

错误：

property then does not exist on type void , A typescript error

有人可以帮助我更正此代码片段，以便 'then' 功能正常工作吗干杯！

Answer 1

这里的问题是 passwordreset() 函数，

它应该是这样的：

passwordreset(): Promise<any> {
  // this should return a promise
  // make sure , you are returning promise from here
  return this.http.get(url)
             .toPromise()
             .then(response => response.json().data)
             .catch(this.handleError);
}

You were returning the promise inside promise function , but not returning it from passwordreset(),

请查看您的代码和更新后的代码，您会有所了解

您的代码：

passwordreset(email)
{ 
        var promise = new Promise((resolve,reject)=>{ 
            firebase.auth().sendPasswordResetEmail(email).then(()=>{ 
                            resolve({success :true}); 
                            })
                            .catch((err)=>{ 
                                reject(err); 
                            }) 
                            return promise; 
        }); 
}

更新代码：

passwordreset(email): Promise<any>
{ 
        return new Promise((resolve,reject)=>{ 
            firebase.auth().sendPasswordResetEmail(email).then(()=>{ 
                                resolve({success :true}); 
                            })
                            .catch((err)=>{ 
                                reject(err); 
                            }); 
        }); 
}

Answer 2

我用这个处理

singlesender(data){

return new Promise((resolve,reject)=>{ 
  this.userService.getAccessToken().then(accesstokendata=>{
    this.accesstoken=accesstokendata;
    console.log(this.accesstoken);
    console.log("hello");

    console.log("hello2");
    let dataToSend = new HttpParams()
      .set("senderidforme", data.senderidforme)  

    let header = new HttpHeaders()
    .set("Content-type", "application/x-www-form-urlencoded")
    .set("Authorization", "Bearer "+this.accesstoken);

      return this.get(SERVER_URL+"web/v2/user-message-unreadcountsignle", dataToSend, header);
  })
  .catch(error=>{

  })


}); 


      }

属性 then does not exist on type void ，打字稿错误

property then does not exist on type void , A typescript error

typescript

typescript2.0

angular