Question

为什么路线没有在这里注册？出于某种原因，当我访问/ api / test时，我找不到404。当我在当时的功能之外移动路线注册时，它可以工作。此代码段是从快速生成的模板中的app.js添加的。

var Q = require('q');

promisify().then(stringText => {
    var route = express.Router();
    route.get('/test', (req, res) => res.send('Hi'));
    app.use('/api', route);
});

function promisify() {
  var deferred = Q.defer();
  deferred.resolve('Hello World');
  return deferred.promise;
}

这有效（如果你在外面移动路线注册）：

var Q = require('q');

var route = express.Router();
route.get('/test', (req, res) => res.send('Hi'));
app.use('/api', route);

promisify().then(stringText => {

});

function promisify() {
  var deferred = Q.defer();
  deferred.resolve('Hello World');
  return deferred.promise;
}

更新：重现的步骤

通过从命令行键入express，在文件夹上创建快速模板。
然后安装软件包npm install。
同时安装q库npm install --save q

在注册其他路径的代码下方添加代码：

app.use('/', index);
app.use('/users', users);

// Add the code above here

Answer 1

您是否在控制台中收到任何错误？如果没有你启动服务器？我试着做你的逻辑（在承诺内和承诺之外）我发现它使用http://localhost:3000/api/test下面的代码

1.Inside Promise Callback

const express = require('express');
const app = express();
const Q = require('q');

promisify().then(stringText => {
  console.log("called promise success");
  console.log(stringText);
  var route = express.Router();
  route.get('/test', (req, res) => res.send(stringText));
  app.use('/api', route);
});

function promisify() {
  const deferred = Q.defer();

  if (true) deferred.resolve('Hello Chris James');

  return deferred.promise;
}

app.listen(3000, function () {
  console.log('Example app listening on port 3000!')
})

2.Outside Promise回调

const express = require('express');
const app = express();
const Q = require('q');

var route = express.Router();
route.get('/test', (req, res) => res.send('Hi'));
app.use('/api', route);

promisify().then(stringText => {

});

function promisify() {
  var deferred = Q.defer();
  deferred.resolve('Hello World');
  return deferred.promise;
}

app.listen(3000, function () {
  console.log('Example app listening on port 3000!')
});

的package.json

{
  "name": "route-check",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start" : "node index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.14.1",
    "q": "^1.4.1"
  }
}

Express JS路由不在Promise内部工作

1 个答案: