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js uses ‘+’ before a data type. The purpose of this operation is to convert the data type to Number type. If the conversion fails, it will return NaN; E.g: + ‘2’ + 1 // 3 + [ 1 ] // NaN +new Date() will call the valueOf method on Date.prototype, according to new Date().getTime() […]

nginx enables proxy cache proxy cache in nginx.conf http { add below proxy_cache_path /data/nginxcache levels=1:2 keys_zone=my_cache:500m max_size=10g inactive=30d use_temp_path=off; Add the following configuration to the configuration file of a site: location / { proxy_cache my_cache; proxy_cache_revalidate on; #proxy_cache_valid 200 206 304 301 302 30d; proxy_cache_valid any 30d; proxy_ignore_headers “Set-Cookie”; proxy_ignore_headers “Expires”; #proxy_ignore_headers “Age”; proxy_cache_key… The

How to force restart after ubuntu (linux) system crashes: Press Alt+SysRq+B to force restart. Some computers need to press the Fn key, that is, Fn+Alt+SysRq+B . Note: The sysrq key is generally the same as the prtsc (print screen) key. If your pressing Fn+Alt+SysRq+B doesn’t work, do the following: First press Fn+Alt+SysRq+B, Hold Alt, release

Gatsby Gatsby is a lightning-fast, modern site generator built for React – static sites. Install Gatsby CLI npm install -g gatsby-cli Build the production version gatsby build For more information, please refer to https://ift.tt/npIhfFw … The post Gatsby Static Website Building Process (1)—Installation and Building first appeared on Lenix Blog . This article is reprinted

React JS is essentially an open source JavaScript library used in the web development process to create interactive and dynamic elements on single page applications. What is ReactJS for? Before the introduction of ReactJS in 2013, developers manually created UI (User Interface) using “VanillaJavaScript” or using less UI-based React predecessors such as jQuery. However, this

A few years ago, we realized that the web was approaching a critical inflection point. The advent of WebAssembly and new functional APIs has made it seem possible to write a WebAssembly-based operating system that is powerful enough to run Node.js , entirely in your browser. We envision a great development environment that is faster

Almost a year ago, we launched WebContainers , our in-browser OS capable of running a full Node .js toolchain. The ability to instantly build the web using the web has resonated with developers, and millions of developers now use StackBlitz every month for instant bug reports, live documentation examples, and more. While WebContainer is built

I have talked with you a lot about how to participate in an open source project, and today I will talk with you about how to maintain an open source project. Open source projects are not collections of code: each open source project can be thought of as a small company with its own market

read cookies The content of the cookie can be read directly through document.cookie: var strCookie = document . cookie ;  At this point, strCookie is a string consisting of the name/value pairs of all cookies under the domain name, and the name/value pairs are separated by “semicolon and space”. For easy viewing, you can use

Writing return directly in ajax in the function addSglr() method does not take effect; Because it returns the success method in ajax, not addSglr(). Therefore, a global variable can be set for judgment to achieve the effect of stopping. Note: Ajax must be synchronous. function addSglr(){ var flag = false;//Global variable for the following judgment

1. Namespace Separation to minimize the number of resources (TCP connections) client var qq = io . connect ( ‘http://localhost:3000/qq’ ) ; qq . on ( ‘connect’ , function ( ) { console . log ( “连接成功” ) } ) qq . on ( ‘news’ , function ( data … The post socketio namespace and

Method: 1. Get the checkbox element, and then use the “get(0).checked)” method to judge; 2. Get the element, and then use the “is(‘:checked’)” method to judge; 3. Get the element, and then use “ttr(‘checked’)” method to judge. Several methods of jQuery to determine whether the checkbox is selected method one: if ($(“#checkbox-id”)get(0).checked) { // do

In CSS, no line breaks are enforced, the text will not wrap, and the text will continue on the same line until it encounters a br tag. white-space:nowrap; … The post css forcing no line breaks first appeared on Lenix Blog . This article is reprinted from https://blog.p2hp.com/archives/9189 This site is for inclusion only, and