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On the surface I’m a tech blogger . But I didn’t expect to become an emotional blogger today. I didn’t expect that one day, I would use technical knowledge to save the fans’ broken feelings. Said heartily. This thing is more or less meritorious . Here’s the thing. Recently, a reader added my green skin […]

1. Q: What is ES6, why should we learn it, and what will happen if we don’t learn ES6? Answer: ES6 is a new generation of JS language standards. It has upgraded and optimized the core content of the JS language, standardized the use of JS, and added JS native methods, making the use of

Linux is a multi-user operating system. After each user logs in, there will be a dedicated operating environment. Usually, the default environment for each user is the same, and this default environment is actually the definition of a set of environment variables. Users can customize their own operating environment by modifying the corresponding system environment

$(“input”).keydown(function(event){ if (event.keyCode == 13) { /* Submit or other operations */ } }); Reprinted at: https://ift.tt/zLJg5Y6 … The post JS – Input input box click enter to submit or do something else first appeared on Lenix Blog . This article is reprinted from https://blog.p2hp.com/archives/9332 This site is for inclusion only, and the copyright belongs

The full amount of composer images that can be used in China is specially organized. mirror usage $ composer config -g repo.packagist composer mirror address $ composer clearcache $ composer update || install Note: If the project has been installed from other sources before, you can delete the composer.lock and vendor directories and regenerate. close

fetch() is an upgraded version of XMLHttpRequest for making HTTP requests in JavaScript scripts. Browsers provide this object natively. This chapter details its usage. directory [ hidden ] Basic usage Response object: handles the HTTP response Synchronized properties of the Response object Determine whether the request was successful Response.headers property How to read content Response.clone()

WebSocket is a network communication protocol that is required for many advanced functions. Anyone who is new to WebSockets asks the same question: we already have the HTTP protocol, why do we need another protocol? What benefits can it bring? The answer is simple, because the HTTP protocol has a flaw: communication can only be

Page Visibility API Introduction Sometimes, developers need to know that the user is leaving the page. The common method is to listen for the following three events. pagehide beforeunload unload However, these events may not fire on the phone, and the page just closes. Because the mobile phone system can directly transfer a process to

At work, we often need to view the real-time network card traffic of the server. Usually, we will view the real-time network card traffic of the Linux server in these ways. Table of contents 1. sar 2. /proc/net/dev 3. ifstat 4. iftop 5. nload 6. iptraf-ng 7. nethogs 8. Expansion 1. sar The sar command

I. Introduction When the website is doing an activity, a prompt will appear with a countdown to the deadline. The effect is as shown in the figure: 2. Analysis ①Reminder time is constantly changing every second, you need to use timer (setInterval) //1000表示每隔一秒变化一次，单位为毫秒setInterval(countDown, 1000); ②The three boxes are assigned values ​​through innerHTML, and the hours,

1. Google Chrome F12 2. Right-click on the header 3. If gzip is enabled, gzip will be displayed, if not, it will be empty … The post How to see if a page has gzip compression turned on first appeared on Lenix Blog . This article is reprinted from https://blog.p2hp.com/archives/9288 This site is for inclusion

What is a preflight request? preflight, a cors preflight request, belongs to the options request. This request is made automatically by the browser when it thinks that an upcoming request might have unpredictable effects on the server. Using the preflight request, the browser can know whether the current server allows the execution of the upcoming

1. Open any browser. This article takes the chrome browser as an example. After opening, press F12 to enter the developer mode and click the [Console] tab. 2. In the [Console] tab, write js code, first assign the current date and time to a js variable curTime, the code is as follows: var curTime =