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
We programmed our own statistical record pages in HTML and Javascript jQuery to record them on Chrome's local storage every time we change the numbers (like the following) $('input[name=hoge]').change...
I am currently a beginner studying JavaScript.The code is debugged below, and letres_=await this.callApi()If the callApi is undefined, you will get in trouble.There is no description of callApi in the...
<ul> <li>Chocolate</li> <li>Vanilla</li> <li>Strawberry</li> <li> Bananas</li></ul>When <li> is clicked above, I would like to get wha...
I'm creating a page, typing text in a text box, and clicking anywhere in the page will erase the contents of the text box, so I'd like to find out what's going on when the cursor moves away from the t...
There was a code that passed the global object defined in the function as an argument. What is the possible reason?·Why is it not window or this?· Am I correct in understanding that global objects nee...
We use ChartJS to display bar graphs.I defined callbacks in the tooltips property to edit the contents of the tooltips, but The tooltip does not change the contents.Do you know the cause?▼ Execution E...
(Two answers) 4 years agoThere is an error in client.js, but I don't know where to fix it.It seems to be an error with the symbol <, but I don't use it anywhere, so it's refreshing.If you are f...
Sample Code const path = 'index'; // index may be summary/productconstarray=['index']; // index may be summary/productconst result=array.find(page=>{ if(page===path||`${page}/`===path){ return page...
I got b for the pull-down (select tag), so I want it to be b=SELECT, but for some reason it might be b=BODY.When I checked the activeElement specifications on the page below, I found the following:Doc...
function A(){};A.prototype.a=function(){ // any other treatment // Calling A.prototype._b This._b();};A.prototype._b = function(){};A.prototype._b is used only in A.prototype.a and assumes modules tha...
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