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What is the asynchronous mechanism of node based on?

The asynchronous mechanism of node is based on "events". All I/O, network communication, and database queries are executed in a non-blocking manner, and the returned results are processed by the event loop. Node will only process one event at the same time, and immediately enter the event loop to check subsequent events after completion. In this way, the CPU and memory can focus on processing one thing at the same time, while trying to allow time-consuming I/O and other operations to be executed in parallel.

Jul 11, 2022 pm 07:18 PM

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Which is the global object of node?

The global object of node is "global". The most fundamental role of global is to serve as the host of global variables; and all global variables (except global itself) are attributes of the global object. Global properties can be accessed directly in Node.js without including it in the application.

Jul 11, 2022 pm 07:01 PM

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What are the node.js background frameworks?

The node background framework includes: 1. Koa, an open source Node web framework that uses Generator to implement middleware process control and try/catch to enhance exception handling; 2. Nest, an efficient and scalable Node server. A framework for client applications; 3. Socket, a framework used to create real-time two-way communication between the client and the server; 4. Sails, a very solid Node framework that provides everything needed to build web applications of any scale. All features.

Jul 11, 2022 pm 06:20 PM

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What is the relationship between npm and node.js?

npm means "node package manager" in Chinese. It is the default package management tool of the Node.js platform. It will be installed together with Nodejs. npm manages third-party plug-ins corresponding to node.js; you can install, share, and distribute code through npm. , manage node project dependencies.

Jul 11, 2022 pm 06:00 PM

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What is the difference between node and php?

The difference between node and php: 1. node is a JavaScript running environment, while PHP is a programming language; 2. node has fewer dependencies. You can set up a web server with a few lines of code, while running a PHP application requires External server software; 3. Node is more used for desktop application development, while PHP is most suitable for the backend of Web applications.

Jul 11, 2022 am 10:49 AM

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Can reactjs only run in node?

reactjs does not only run in node; it is a JavaScript library used to build user interfaces. In development mode, the Create react application runs NodeJs and Webpack development servers, but if it is not rendered on the server side, reactjs is just a front-end framework. It can be used with JavaScript, no node is required.

Jul 06, 2022 pm 05:38 PM

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What is a global package in node

In node, the global package refers to the tool package used to install local packages in the project, such as nrm, yarn, cnpm, etc.; the software package is a library included in the program and must be installed in every project that uses the software package. Local packages, and global packages only need to be installed in one location. You can use the -g or --global option to command npm to install global packages, or you can use "npm ls -g" to view installed global packages.

Jul 06, 2022 pm 05:28 PM

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What is the difference between node version 14 and 10

The difference between node versions 14 and 10: 1. Version 10 stops using the V8 engine in Chromium and uses version 6.6 of V8, while the V8 used in version 14 has been upgraded to version 8.1; 2. Version 14 can directly use "ES Modules" and does not It will sound an alarm, but it cannot be used in version 10.

Jul 06, 2022 pm 04:37 PM

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Is there a timer in node.js?

There is a timer in "node.js"; the timer module in "node.js" contains a function that executes the code for a certain period of time. The timer does not need to be introduced through require(), because all methods simulate the browser The JavaScript function in "node.js" is global; the timer function in "node.js" implements an API similar to the timer API provided by the web browser.

Jul 04, 2022 pm 05:28 PM

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Can the es module be executed in node?

The es module can be executed in node; node has supported the native es module since version 8.5.2. This function can be turned on through the command line option. The es module, also known as the ECMAScript module, is a JavaScript code reuse mechanism, but it cannot be used in the es module. Use require() in .

Jul 04, 2022 pm 05:08 PM

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Is node.js a server language?

"node.js" is not a server language, but a JavaScript running environment based on the "Chrome V8" engine; nodejs uses an event-driven, non-blocking I/O model and is an open source code that can run JavaScript on the server side. , cross-platform execution environment.

Jul 04, 2022 pm 04:37 PM

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What is the difference between node, nvm and npm

The difference between node, nvm and npm: 1. nodejs is the code library required for project development, nvm is the nodejs version management tool, and npm is the nodejs package management tool; 2. nodejs can enable javascript to run without the browser, and nvm can manage it Versions of nodejs and npm, npm can manage third-party plug-ins for nodejs.

Jul 04, 2022 pm 04:24 PM

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Detailed explanation of how to use Node.js to develop a simple image crawling function

How to crawl using Node.js? The following article will talk about using Node.js to develop a simple image crawling function. I hope it will be helpful to you!

Jun 30, 2022 pm 07:55 PM

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How to use archiver in nodejs

In nodejs, archiver is used to compress and package some files into compressed packages in zip format or tar format; archiver is a module that can implement packaging functions across platforms. The packaging formats are zip and tar. You can use the "npm install archiver" statement Install this module before use.

Jun 29, 2022 pm 04:00 PM

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