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Nodejs implements crawler

The method steps for nodejs to implement crawler: 1. Introduce the request and cheerio modules in the index.js file; 2. Define a target URL; 3. Use the request module to send a GET request to this URL and obtain the response data; 4. Through The $ symbol takes the content of which class; 5. Write the data to the json file; 6. Introduce the fs module provided by node; 7. Manually create the data.json file and store the data in it.

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Nodejs implements crawler

How to connect koa2 to mysql in Nodejs

Convert query results into objects or arrays. In real development, some query results should actually be put into an object JSON_OBJECT: () is in the form of key-value SELECT products.idasid, products.titleastitle, products.priceasprice, products .scoreasscore,JSON_OBJECT('id',brand.id,'name',brand.name,'rank&#

Jun 01, 2023 pm 12:40 PM

mysql nodejs koa2

Install nodejs through soft connection

When installing Node.js on a server, there are generally two methods. The first method is to download the binary and then install Node.js by unzipping and copying to the appropriate directory. This method works for most Linux distributions. However, it gets tricky when we want to install different versions of Node.js. To solve this problem, we can use soft connections to install Node.js. A soft link refers to a special file type in the file system that points to another file. Soft links can be in different parts of the file system

May 28, 2023 pm 04:45 PM

Designing a RESTful API using NodeJS and Restify

RESTfulAPI contains two main concepts: resources and representation. A resource can be any object associated with data, or identified by a URI (multiple URIs can reference the same resource), and can be manipulated using HTTP methods. Representation is the way a resource is displayed. In this tutorial, we will cover some theoretical information about RESTful API design and implement a sample blog application API using NodeJS. Resources Choosing the right resources for a RESTful API is an important part of the design. First, you need to analyze your business domain and then decide on the amount and type of resources to use that are relevant to your business needs. If you are designing a blogging API, you might work with posts, users, and comments. these are

Sep 03, 2023 am 10:37 AM

Can nodejs do cnc?

Node.js can complete many tasks, such as server-side programming, web application development, etc., but whether it can be used in the field of numerically controlled machine tools (CNC) still needs to consider its applicability and limitations. First, we need to understand what CNC is. CNC is the abbreviation of Computer Numerical Control, which is an automatic control technology. It inputs digital instructions into the computer, and then the computer controls the CNC machine tool to complete processing and manufacturing. This technology enables efficient, accurate, repeatable, high-quality processing

May 28, 2023 pm 03:10 PM

Tips | Python crawler tool Selenium from entry to advanced

Selenium is one of the most widely used open source Web UI automated test suites. It supports languages including C++, Java, Perl, PHP, Python and Ruby. It is also a powerful tool in data capture and can solve the response of most web pages. Climbing measures.

Aug 10, 2023 pm 02:40 PM

python

How to use go language to develop and implement web crawlers

How to use Go language to develop and implement web crawlers Introduction: A web crawler is a program that automatically extracts data (such as text, images, videos, etc.). It automatically browses and collects information on the Internet. This article will introduce how to use Go language to develop and implement a web crawler, and attach corresponding code examples. 1. Introduction to Go language Go language is an open source programming language developed by Google and first released in 2009. Compared with other programming languages, Go language has strong concurrency characteristics and efficient execution speed.

Aug 04, 2023 pm 08:24 PM

go language Web Crawler Development and implementation

Crawler｜Python crawls pictures of girls from station B, motivation to learn!

In this issue, I will introduce to you how to use Python to crawl pictures of girls from station B. I hope it will be helpful to you.

Aug 09, 2023 pm 05:11 PM

python

Tips and precautions for using PHP crawlers

Tips and precautions for using PHP crawlers With the rapid development of the Internet, a large amount of data is constantly generated and updated. In order to facilitate the acquisition and processing of this data, crawler technology came into being. As a widely used programming language, PHP also has many mature and powerful crawler libraries available for use. In this article, we will introduce some tips and precautions for using PHP crawlers, along with code examples. First, we need to clarify what a crawler is. In short, a crawler simulates human behavior, automatically browses web pages and extracts

Aug 06, 2023 am 11:39 AM

php Skill reptile

How to write a crawler in nodejs

How to write a crawler in Node.js? In today's digital age, the amount of data on the Internet is growing exponentially. Therefore, crawlers are becoming increasingly important. More and more people are using crawler technology to get the data they need. Among the most popular programming languages in the world, Node.js is becoming one of the most popular development languages for crawlers due to its efficient, lightweight and fast features. So, how to write a crawler in Node.js? Introduction Before starting to introduce how to write a crawler in Node.js, let's first understand what a crawler is. Simply put, a crawler is a

Apr 05, 2023 pm 01:49 PM

How to write a crawler in nodejs

Steps to write a crawler in nodejs: 1. Install Node.js; 2. Create a file named `crawler.js`; 3. Define the URL of the web page to be crawled; 4. Use the `axios.get()` method to send HTTP GET request to obtain the page content; after obtaining the content, use the `cheerio.load()` method to convert it into an operable DOM object; 5. Save and run the `crawler.js` file.

Sep 14, 2023 am 09:58 AM

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