node.js | 易学教程

node child process: will it always terminate by itself?

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问题 I have code to spawn child process like this: const spawn = require('child_process').spawn; const ls = spawn('ls', ['-lh', '/usr'], { detached: true }); ls.stdout.on('data', (data) => { console.log(`stdout: ${data}`); }); ls.stderr.on('data', (data) => { console.log(`stderr: ${data}`); }); ls..on('error', (data) => { console.log(`error: ${data}`); }); ls.on('close', (code) => { console.log(`child process exited with code ${code}`); }); Till now, I can console message from stdout and stderr,

Install nodejs on shared server

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问题 I have one shared server acoount. Searched more time "how to install nodejs on shared server" but i can't find any thing. Just this link but not working 回答1: Login on SSH and type this code: wget -qO- https://cdn.rawgit.com/creationix/nvm/master/install.sh | bash Now close and reopen your terminal to start using nvm or run the following to use it now: export NVM_DIR="$HOME/.nvm" [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"

Correct mental model for a Javascript async function's 'await': generator's 'yield' vs. 'promise.then()'?

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问题 Which of a generator's yield vs. promise.then() is a more* correct mental model for understanding 'await'? Property comparison, inferred by stepping through the snippet below with a debugger: await: await does not pause/suspend the running async function’s execution. (The running async function ‘runs to completion’, returning a pending promise when the interpreter hits the 1st await. It’s then immediately removed from the call stack.) await waits for the promise to settle. await expression

SOAP Request using nodejs

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问题 Hi can anyone help me out. how to request soap web service and get the xml response. Senario: Using soap ui im sending wsdl url with username, password authentication and also i will send soap xml data and i gets reponse. Same thing how to achive using nodejs or sails. In SoapUi My soap xml request is like <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tier="http://HCSLN9191-GMS.gois.ito.unisys.com/Tier1ICLStd:Tier1ICLMB_StdDispatch"> <soapenv:Header/>

How do I export an object with added prototype methods in node.js

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问题 I have an object in a file and want to be able to require that file and then create new instances of the object at whim, but I've hit a snag. This seems so incredibly basic, what am I missing. hat.js function Hat(owner) { this.owner = owner; } Hat.prototype.tip = function() { console.log("and he (" + owner + ") tipped his hat, just like this"); } exports.Hat = Hat; node terminal Attempt 1 > require('./hat.js'); > var mighty_duck = new Hat('Emilio'); ReferenceError: Hat is not defined Attempt

SOAP Request using nodejs

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php 关于laravel5.7框架

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一、配置首先说下配置，安装 node.js 、npm 。cmd 命令行 node -v 、npm -v 若已安装出现版本号，若无自行百度安装 compaser 通过compaser命令安装laravel 到指定目录配置成功后如下图：二、框架模型 laravel 也是基于 MVC 模式， model -> view -> controller 。如若写接口则是 model -> logic(逻辑层) -> controller ，再加前端 vue 完美。先说说laravel 的优点：其一因为本身框架基于php ，所以支持php很多特性，其二是代码本身比较简洁，其三开发效率快下图是laravel安装成功后的文件，这里我的开发工具是 phpstorm 三、语法要点这里要讲比较重要，都是踩过的坑第一讲讲laravel 的命名空间问题写法 namespace App\Http\Logic 注意下划线 \ 引用类则是 use 这里有个关于DB 的引用，可能你未引用 Illuminate\Support\Facades\DB 也能点出 DB 但会报错继承 extends 这里要写好你的json公共继承类结构这里和C# 类的实例化有点相似方法 public function __construct() 例： $this -> model=new Student()

Easiest way to run Selenium tests in a Docker container over Jenkins CI

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问题 I want to execute my automated tests, written in Nightwatch-Cucumber over a Jenkins CI in a Docker container. I have a Docker image that I want to use for it. This is what I want to do in more detail. Start tests over Jenkins CI job On the same machine the Docker image is loaded and the related Docker container will start. This container based on a Unix OS. Also, some configuration in Docker container will be executed. Tests will be executed (from local or remote) in a headless mode via xvfb

Synchronous loop in Promise all

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问题 I would like to do a synchronous loop in a part of my code. The function saveInDatabase checks if the item title (string) already exists in the database. That's why it can't be resolved in parallel, otherwise the condition will never apply (and would create duplicates). Promise.all(arr.map(item => { saveInDatabase(item).then((myResult) => ... ); })); I tried to encapsulate this function into separate promises, also tried with npm packages (synchronous.js, sync), but it seems that it does not

Dealing with slash characters in request parameter using Express route

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问题 I'm currently working on a URL shortener app using Express. I want the user to be able to enter a URL like this: https://www.exampleurlshortener.com/new/https://www.google.com The problem is whenever I try to specify the parameter using Express it will only extract the 'https:' section and everything after that is lost because the 2 backslashes are registering as a new route: app.get('/new/:url', (req, res) => { console.log(req.params.url) // outputs 'https:' I thought about specifying each