node.js | 易学教程

protocol packets out of order

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问题 I recently uploaded my node.js app on A2 Hosting and I get this error : { Error: Packets out of order. Got: 80 Expected: 0 at Parser.write (/home/westudec/public_html/myapp/node_modules/mysql/lib/protocol/Parser.js:42:19) at Protocol.write (/home/westudec/public_html/myapp/node_modules/mysql/lib/protocol/Protocol.js:39:16) at Socket.<anonymous> (/home/westudec/public_html/myapp/node_modules/mysql/lib/Connection.js:103:28) at emitOne (events.js:96:13) at Socket.emit (events.js:188:7) at

How to import firebase-functions and firebase-admin in ES6 syntax for transpiling with Babel for Node 10

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问题 I'm currently writing my cloud functions in ES6 and transpiling with Babel to target the Node v10 environment. And I've noticed something weird. Why is that when I import firebase-functions like this: import functions from 'firebase-functions'; I get this error: ! TypeError: Cannot read property 'https' of undefined at Object.<anonymous> (C:\myProject\functions\index.js:28:55) And to fix it, I need to import it like this: import * as functions from 'firebase-functions'; While the following

Fetch blob from URL and write to file

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问题 I'm trying to fetch some binary data (MP3) from a server and then store it in a file: var fs = require ('fs'); var fetch = require ('node-fetch'); fetch ( audioUrl, { method: 'GET', headers: { 'Accept': '*/*' } } ) .then ((res) => res.blob()) .then ((blob) => { console.log ('Blob size: ', blob.size); fs.writeFile ( `filename.mp3`, blob, // BUG HERE (err) => { if (err) { console.log (`Error writing audio ${audioIdx}`, err); } } ); }) The problem is marked at BUG HERE . I'm passing a blob to fs

Fetch blob from URL and write to file

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How to clone a mongoose document?

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问题 This is a followup to Easiest way to copy/clone a mongoose document instance?, which isn't working for me. The following code throws a "cannot edit Mongo _id" field, rather than wiping the ._id and creating a new document in the collection. Is there a better way to clone all values of a document into a new document, for further use/testing/etc? I'm on Mongoose 3.8.12/Express 4.0, and I have also tested this on creating a new ObjectID in the 'undefined' s1._id field below. router.route('/

How to read chunks for a text file based on a word as a key delimiter?

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问题 I have a .txt file with this format: Part #368 - XXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Part #369 - XXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

window配置Vue2开发环境

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一、介绍 Vue (读音 /vjuː/，类似于 view) 是一套用于构建用户界面的渐进式框架。与其它大型框架不同的是，Vue 被设计为可以自底向上逐层应用。Vue 的核心库只关注视图层，不仅易于上手，还便于与第三方库或既有项目整合。另一方面，当与现代化的工具链以及各种支持类库结合使用时，Vue 也完全能够为复杂的单页应用提供驱动。官网： https://cn.vuejs.org/ 二、准备 Node.js --是一个基于 Chrome V8引擎的 JavaScript运行环境。 npm(cnpm) --是随同NodeJS一起安装的包管理工具，cnpm是淘宝对npm的镜像服务器， vue-cli --是Vue的脚手架工具,主要作用：目录结构、本地调试、代码部署、热加载、单元测试 webpack --是一个模块打包器。它的主要目标是将 JavaScript文件打包在一起,打包后的文件用于在浏览器中使用三、下载配置 Node.js 直接官网下载： https://nodejs.org/zh-cn/download/ 打开cmd（以管理员身份运行）查看Node.js版本确定是否已安装 node -v npm 查看npm版本 npm -v 升级npm cnpm install npm -g cnpm 安装cnpm npm install -g cnpm --registry

Firebase - TypeError: Path must be a string. Received undefined

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问题 I am just starting up with firebase. i am not sure ins and out of the firebase and based on my vaguely understanding, I have configured my app this way. In the main Index.js file, I am requiring const path = require('path') const firebaseConfig = require("./src/config/firebaseConfig.js") const firebaseDb = require("./src/helperFunctions/firebase_db.js") Here, firebaseConfig is the place where I am configuring my firebase const firebaseConfigJSON = require("./functions-config.json") const

Parallel Request at different paths in NodeJS: long running path 1 is blocking other paths

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问题 I am trying out simple NodeJS app so that I could to understand the async nature. But my problem is as soon as I hit " /home " from browser it waits for response and simultaneously when " / " is hit, it waits for the " /home " 's response first and then responds to " / " request. My concern is that if one of the request needs heavy processing, in parallel we can't request another one? Is this correct? app.get("/", function(request, response) { console.log("/ invoked"); response.writeHead(200,

How to call an api from another api in expressjs?

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问题 I have an api like this: app.get('/test', (req, res) => { console.log("this is test"); }); and another api: app.get('/check', (req, res) => { //I want to call "test" api without redirect to it. }); I want to call "test" api in "check" api without redirect to "test" api, just do the function in the "test" api. Above is the example code. 'Cause I dont' want to rewrite function from "test" api to "check" 回答1: Simple solution is to define a method which can be called using both request routes.