JavaScript (/ˈdʒɑːvəskrɪpt/), often abbreviated JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. As of 2022, 98% of websites use JavaScript on the client side for web page behavior, often incorporating third-party libraries. All major web browsers have a dedicated JavaScript engine to execute the code on users' devices.
JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard. It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM).
The ECMAScript standard does not include any input/output (I/O), such as networking, storage, or graphics facilities. In practice, the web browser or other runtime system provides JavaScript APIs for I/O.
JavaScript engines were originally used only in web browsers, but are now core components of some servers and a variety of applications. Two of the most popular runtime systems for this usage are Node.js and Deno.
Although Java and JavaScript are similar in name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design.
Reference: WIKIPEDIA
1427 questions
In order to detect the completion of loading of img elements and display hidden elements, I would like to generate CSS using onload=, but I don't understand how to do it.<style> Selector {displa...
Handsontable sets columnSorting:true to sort in ascending order when you click on a column header, and then click again to sort in descending order. Can I change this to descending order by clicking t...
There are two definitions of functions in JavaScript, but I don't know the difference or usage, so please let me know.Pattern 1 function hoge(a,b){ ...}Pattern 2 var hoge=function(a,b){ ...}Is hoge(a,...
I would like to implement a menu that remains in a fixed position on the page even if I scroll, such as sponsor link at the bottom of the right menu of the site below.http://www.akb48matomemory.com/ar...
Do you want to improve this question?Edit this post and update the question to focus on one issueClosed 7 years ago.7 years agoI'm thinking of studying front-end, but I can't decide whether to study a...
onMapMoved=function(e){ map.removeLayer(markerList); var url=https://api.twitter.com/1.1/search/tweets.json; varsearchKeywords=get_search_keywords(); if(searchKeywords.length>0){ searchKeywords.for...
Do you want to improve this question?Edit this post and update the question to focus on one issueClosed 7 years ago.7 years agoI'm thinking of studying front-end, but I can't decide whether to study a...
Handsontable sets columnSorting:true to sort in ascending order when you click on a column header, and then click again to sort in descending order. Can I change this to descending order by clicking t...
When I ran this code, I got a strange resultfunctionprintFive(){ for(vari=0;i<5;i++){ setTimeout(function(){ console.log(i); }, i*1000); }}printFive();If you do this,01234If you think is going t...
I'm going to show you what's on the chrome console and what's on the console (iframe).I'd like to put it in a variable as a string and output it to html.What are the options?Thank you for your coopera...
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