Question

如何在承诺后显示结果？我在console.log("the result is==>", result)中看到了结果，但是在promise.then下却看不到控制台。

const signIn = (password) => {
  var request = new DeviceAuthQuery();
  request.setPassword(password);
  let result;

  var response = client.authenticate(request, {}, (err, response) => {
    console.log("Request Sent 1111");
  });

  let promise = new Promise(() => {
    response.on('data', function(reply) {
      console.log('Data: 22222' + reply.getAuthjwt());
      result = reply.getAuthjwt();
      console.log("the result is==>", result)
      promise.resolve(true);
    });
  });

  promise.then(() => {
    console.log("the result ZZZZZ==>", result)
  })

Answer 1

您错过了回调结果：

let promise = new Promise((resolve) => {
   response.on('data', function(reply) {
     console.log('Data: 22222' + reply.getAuthjwt());
     result = reply.getAuthjwt();
     console.log("the result is==>", result)
     resolve(true);
   });
});

promise.then((result) => {
  console.log("the result ZZZZZ==>", result)
})

Answer 2

您应该在提供给Promise构造函数的函数中使用参数，以便解析/拒绝承诺。然后，您只需将数据作为参数传递给这些数据即可。这是一个基本示例：

const signIn = () => {
  var promise = new Promise((resolve, reject) => {
    setTimeout(function() {
      resolve("Foo Bar");
    }, 2000)
  });

  promise.then((result) => {
    console.log("the result ZZZZZ==>", result)
  })
}

signIn();

如何解决承诺功能

2 个答案: