Several ways to write JavaScript array loops, including ES6

Using Javascript map(),reduce() and filter() arrays can help you write more declarative and fluent style code. Instead of accumulating for loops and nesting to process data in lists and collections, you can use these methods to better organize successful building blocks of logical organization, and then link them together to create more readabl ...

Posted on Fri, 11 Oct 2019 23:13:38 -0700 by EGNJohn

The difference between == and === in JavaScript

"==" case 1. Two different basic data types: if the two basic data types (string, number) are different, they will be converted into data types, and then compared. For example: 0 == '' // true 0 == '0' // true 1 == '1' ...

Posted on Fri, 11 Oct 2019 11:52:38 -0700 by vjbrantner@purd

Front-end javascript exercises-simple calendar and tab switching

Front-end javascript exercises-simple calendar and tab switchingSimple calendareg1: Output the values in the arrayStyles can be changed directly, or class names can be changed.var okuang=document.getElementById("kuang");var oli=document.getElementsByTagName("li");var arr=[11,22,33,44,55];var index=0; //Define a variable to s ...

Posted on Fri, 11 Oct 2019 10:39:31 -0700 by feddie1984

Grabbing json data of county map

Find a lot of resources on the Internet, either the data is too old, data is wrong, or to charge, so I grabbed Ali's data. data source Project source code Data is asynchronously fetched and written, so axios is used. The node version is 12.10.0.Introduce needed resources: import http from 'axios' import fs from 'fs' Address and address splicin ...

Posted on Fri, 11 Oct 2019 09:15:05 -0700 by phplearner

js sorting method

Summary and comparison of js ten classical algorithmsExcerpts from the original https://www.cnblogs.com/AlbertP/p/10847627.htmlA map summarizes: Overview of Mainstream Sorting AlgorithmsNoun Interpretation:n: Data sizek: number of barrelsIn-place: Constant memory, no extra memoryOut-place: Take up extra memoryStability: The order of the two equ ...

Posted on Fri, 11 Oct 2019 01:18:05 -0700 by Supplement

How to Use Thinkphp 5.1 to Realize Conditional Query and Paging in PHP

ps: This is a problem I had a long time ago. Actually, it's very simple. Listen to me slowly. First up code back-end <?php namespace app\admin\controller; use think\Controller; use think\Request; class Brand extends Controller { /** * Display Brand List * * @return void */ public function lst() { / ...

Posted on Thu, 10 Oct 2019 09:07:44 -0700 by AL123

A case study to understand the scope slot of Vue.js

Original address: Getting Your Head Around Vue.js Scoped Slots Author: Anthony Gore Translator: Chor Scope slot is a very useful feature in Vue.js, which can significantly improve the universality and reusability of components. The problem is that it's really not easy to understand. It is no less painful to try to understand the intricate r ...

Posted on Thu, 10 Oct 2019 06:08:41 -0700 by konky

A Probe into koa-session Source Code

Introduction Now that you've dug a hole, you have to fill it in. In the previous article on Authentication of Next, we talked about how to use koa-session, mainly configuring and changing the content of session. Let's review it. This is the configuration file. app.use( session( { key: "lxg", overwrite: true, //Overwrite Cookie ...

Posted on Thu, 10 Oct 2019 05:39:40 -0700 by ankurcse

Note a pit encountered when crypto's createCipheriv method was used to encrypt node.js

Node.js crypto module A set of encapsulations including hashing, HMAC, encryption, decryption, signature and verification of OpenSSL are provided. Specific methods of use can be referred to in the description of this article: node.js_crypto module. This paper focuses on the pits encountered when using the createCipheriv method. The correspond ...

Posted on Thu, 10 Oct 2019 05:09:41 -0700 by uluru75

What is the content-type request for text/event-stream?

Recently, when learning the hot update of webpack, we found that there is a _webpack_hmr request, content-type is text/event-stream, which we haven't seen before, so learn to record it. Web pack hot updates need to push information to browsers, and websocket is usually thought of, but there is another way, called Server-Sent Events (SSE). SSE i ...

Posted on Thu, 10 Oct 2019 03:24:39 -0700 by prashanth0626