然后，属性在void类型上不存在，打字稿错误 [英] property then does not exist on type void , A typescript error

问题描述

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:

属性然后不存在于void类型，打字稿错误

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

有人可以通过更正此代码段来帮助我，以便使'then'功能起作用 欢呼！

can someone please help me by correcting this code snippet so that the 'then' function works cheers!

推荐答案

此处的问题与passwordreset()函数有关，

The issues here is with passwordreset() function ,

它应该看起来像这样:

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);
}

---

您正在返回promise函数中的promise，但是没有返回 从passwordreset()返回它，

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，您将获得一个想法

Please have a look at your code and updated code , you will get an idea

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; 
        }); 
}

更新的代码:

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

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