如何.chain，但需要上一个promise-javascript中的resolve（）值？

问题在于“backendLoginCheck”函数。我想。然后（）在“getUserByEmail”之后链接“ifUserIsDisabled”。但是我需要getUserByEmail中的“userRecord”作为“ifUserIsDisabled”的输入

我还希望两个函数共享相同的。catch in“backendLoginCheck”函数

当前代码：

function getUserByEmail(email){
        return new Promise(function(resolve, reject){
        firebase.serverAuthAdmin147th.getUserByEmail(email)
            .then(function(userRecord) {
                resolve(userRecord);
            })
            .catch(function (error) {
                reject({token: null, errorCode: "auth/user-not-found"});
            });
    })
}

function ifUserIsDisabled(userRecord){
    return new Promise(function(resolve, reject){
        if(!userRecord.disabled){
            resolve();
        }
        else{
            reject({token: null, errorCode: "auth/user-disabled"});
        }
    })
}

function backendLoginCheck(email, password, callback){
    var token = null;
    var errorCode = null;
    var uid = null;
    getUserByEmail(email)
        .then(function(userRecord){
            ifUserIsDisabled(userRecord);
        })
        .catch(function(error){
            callback(error);
        });
}

...
getUserByEmail(email)
    .then(ifUserIsDisabled(userRecord))
    .then(nextFunction())
    .then(nextFunction2(uses_resolveVal_from_nextFunction))
    .then(nextFunctionEtc())
    .catch(function(error){
        callback(error);
    });

理想想法：

function getUserByEmail(email){
        return new Promise(function(resolve, reject){
        firebase.serverAuthAdmin147th.getUserByEmail(email)
            .then(function(userRecord) {
                resolve(userRecord);
            })
            .catch(function (error) {
                reject({token: null, errorCode: "auth/user-not-found"});
            });
    })
}

function ifUserIsDisabled(userRecord){
    return new Promise(function(resolve, reject){
        if(!userRecord.disabled){
            resolve();
        }
        else{
            reject({token: null, errorCode: "auth/user-disabled"});
        }
    })
}

function backendLoginCheck(email, password, callback){
    var token = null;
    var errorCode = null;
    var uid = null;
    getUserByEmail(email)
        .then(function(userRecord){
            ifUserIsDisabled(userRecord);
        })
        .catch(function(error){
            callback(error);
        });
}

...
getUserByEmail(email)
    .then(ifUserIsDisabled(userRecord))
    .then(nextFunction())
    .then(nextFunction2(uses_resolveVal_from_nextFunction))
    .then(nextFunctionEtc())
    .catch(function(error){
        callback(error);
    });

应该是这样的：

getUserByEmail(email)
.then(function(userRecord){
  return ifUserIsDisabled(userRecord);
})
.then(nextFunction())

---

如果我理解正确的话，看起来你就快到了。如果承诺中的then链返回另一个承诺，则可以将解析的值传递给该链

例如：

function firstFunction() {
   return new Promise((resolve, reject) => {
       if (someError) {
           reject(firstErr)
       } else {
           resolve('first value')
       }
   })
} 

function secondFunction() {
   return new Promise((resolve, reject) => {
       if (someError) {
           reject(secondErr)
       } else {
           resolve('second value')
       }
   })
} 

firstFunction()
  .then((resolvedFirstValue) => {
      return secondFunction()
  })
  .then((resolvedSecondValue) => {
      console.log(resolvedSecondValue)
  })
  .catch((err) => {
      // any error in the entire chain
      console.error(err)
  })

---

这不能解决我的问题。我在“当前代码”中已经有了。我希望ifUserIsDisabled reject也使用.catch in BackendLoginCheck如果

return

ifUserIsDisabled它应该冒泡到有问题的

catch

。Oops错过了

return

。这正是我想要的。没有意识到这就像“返回”一样简单，很高兴它有帮助！