Learn about node JS (Stream)

Node. The Stream in JS is notoriously difficult to use or even understand. In the words of Dominic Tarr, "flow is the best and most misunderstood idea in Node." Even the creator of Redux and react Dan Abramov, a core team member of JS, is also afraid of Node flow. This article will help you understand streams and how to use them ...

Posted by isurgeon on Wed, 18 May 2022 10:49:24 +0300

From vue to elementUI project

Detailed explanation of common components of Element install element Go to the folder and execute the following command to install yarn add element-ui -S // -S indicates the dependencies used by both the production environment and the development environment Introduce element in main.js, you can use it in the page import Vue from 'vue' impor ...

Posted by Birdmansplace on Wed, 18 May 2022 08:39:48 +0300

Event flow model

JS event flow modelEvent Capturing is a top-down propagation method. Taking click event as an example, it will propagate inward from the outermost root node to the clicked node, which is a way of gradually propagating inward from the outermost node to the target node.Event Bubbling is a bottom-up propagation method. Similarly, take the click ev ...

Posted by benphelps on Wed, 18 May 2022 06:08:10 +0300

Front end embedded point export based on xlsx populate

Three scenarios of realizing excel export function The back end generates excel and encapsulates it, and directly returns the file address to the front end through the interface. After getting the file address, the front end creates a tag through js, assigns the file address to the href attribute of a tag, calls the click method of a tag, and ...

Posted by alwoodman on Wed, 18 May 2022 01:53:23 +0300

js advanced array method

Foreword: When you learn advanced js, you will learn several methods about arrays. I will list several here, and briefly introduce the usage and characteristics. The syntax of each method is similar One.forEach() forEach iterates (traverses) the array This method has no return value and will modify the contents of the original array The fu ...

Posted by lucy on Wed, 18 May 2022 01:47:51 +0300

Analyze the principle of react router V5 from the source code

This article will analyze the source code of the remaining components in the react router <Redirect> Like other routing components, < redirect > uses < routercontext Consumer > receive routing data; Define prop types for < redirect > Redirect.propTypes = { push: PropTypes.bool, from: PropTypes.string, to: PropTypes ...

Posted by dyip on Tue, 17 May 2022 23:20:24 +0300

be based on. NetCore development blog project StarBlog - start building a Web project

Series articles be based on. NetCore development blog project StarBlog - (1) why do you need to write your own blog?be based on. NetCore development blog project StarBlog - (2) environment preparation and creation projectbe based on. NetCore development blog project StarBlog - (3) model designbe based on. NetCore development blog project St ...

Posted by Z3RO21 on Tue, 17 May 2022 22:18:39 +0300

Python+Selenium uses Page Object to automate page testing

Page Object mode is a test design mode in Selenium. It mainly designs each page as a Class, which contains the elements (buttons, input boxes, headers, etc.) that need to be tested in the page. In the Selenium test page, page elements can be obtained by calling page classes, which cleverly avoids changing the test page code when the page elemen ...

Posted by stef686 on Tue, 17 May 2022 19:14:09 +0300

ES6 loops and iterables

Author: Alan StormTranslation: crazy tech nerdoriginal: https://alanstorm.com/es6s-ma...Reproduction without permission is strictly prohibited This article will examine ES6's for ... of loops. old way In the past, there were two ways to traverse javascript. The first is the classic for i loop, which allows you to iterate over an array or any ob ...

Posted by SZero on Tue, 17 May 2022 19:07:58 +0300

let and const commands

  var a = []; for (let i = 0; i < 10; i++) { a[i] = function () { console.log(i); }; } a[6](); / In the above code, the variable i is declared by let, and the current i is only valid in this cycle, so the i of each cycle is actually a new variable, so the final output is 6. 1. There is no variable promotion let doesn't "v ...

Posted by supinum on Tue, 17 May 2022 18:23:39 +0300