我创建了一个基于node.js的Web应用程序。目前我正在使用MSSQL作为数据库。我创建了函数(sql.js),执行相应的SQL函数。我还创建了异步函数处理程序(controllers.js),以便在我的路由器(express)中使用async和await关键字。路由器使用await关键字调用它们。调用这些函数时,我没有遇到任何错误,事实上一切都返回数据并正常运行,但是在我的文本编辑器(VSCode)中,我遇到以下错误
[eslint] Parsing error: Unexpected token =>
经进一步调查,发现在我的控制台中出现了一个未处理的Promise错误。这让我想到我可能没有正确定义控制器。
internal/process/warning.js:18 (node:16328) Warning: a promise was created in a handler at D:\Programs\ColdFusion2016\cfusion\wwwroot\vue_starter\node_modules\express\lib\router\index.js:335:12 but was not returned from it, see http:// goo.gl/ rRqMUw
at Function.Promise.attempt.Promise.try (D:\Programs\ColdFusion2016\cfusion\wwwroot\vue_starter\node_modules\bluebird\js\release\method.js:29:9)
有人发现控制器有什么问题吗?
router.js
const express = require('express');
const router = express.Router();
const {
asyncGet,
asyncPost
} = require('../services/controllers')(router);
const sql = require('../services/sql');
const request = require('../services/request');
/// Get Users
asyncGet('/controller/getUsers', async(req, res, next) => {
console.log('get: /controller/getUsers');
const users = await sql.getUsers();
res.status(200).json(users);
});
/// Get Products
asyncGet('/controller/getProducts', async(req, res, next) => {
console.log('get: /controller/getProducts');
const products = await sql.getProducts();
res.status(200).json(products);
});
module.exports = router;
controllers.js
module.exports = (router) => {
const asyncGet = (route, handler) => {
return router.get(route, (req, res, next) => {
handler(req, res, next)
.catch(error => {
next(error);
});
});
};
const asyncPost = (route, handler) => {
return router.post(route, (req, res, next) => {
handler(req, res, next)
.catch(error => {
next(error);
});
});
};
return { asyncGet, asyncPost };
};
await
。您可以尝试注释掉await sql.getUsers()
等来检查是否存在问题,但我预计这个错误会发生在其他地方。很难确定错误发生在您发布的代码中。 - Estus Flask