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
I'd like to change the number of columns according to the width of the screen with the image in 3 horizontal rows.■What you want to do·I would like to display the image in 3 rows, and if the screen be...
function test(){ window.open(/xxxxx/TEST.PDF, _blank, );}:<body onload='test();'>:If you use iPad Safari and run the above script, the PDF POPUP screen will not open.(The body online window.open...
When specifying the function funcdog in the callback function, I would like to specify the part of dog using the id name of the html element button.Is this possible? If so, what are the possible ways ...
I would like to download CSV using JavaScript.I would like to support UTF-16 BOM present, but when I look at the file that I was able to support with the code below, the character code is hexedicimel,...
In JavaScript (ECMAScript), Function.prototype.length returns the number of required parameters.Function.length-JavaScript|MDNYou can use arguments or rerest parameter を to specify optional arguments ...
I would like to create a function that retrieves multiple json data simultaneously through jquery's ajax communicationPlace the associative array of URLs and parameters in an array request and getData...
I want to use SoundJS using React, but I get an error.I also use PreloadJS to load music files.I am not sure what the error is, so I would appreciate it if you could let me know.It works by scratching...
I would like to send a POST request via JavaScript.The header information requested by the server side is as follows:Basic Authentication'Accept' is 'application/json' 'Content-Type' is 'application/j...
Now, when there is an array of Promise, I would like to wait in the order of the resolve. ES2021 introduced the syntax for wait of, so if you have a function such as a library that converts Promise ar...
For example, if you keep an array of unique IDs and add/remove them, you will need to determine if they have already been added.I wonder whether I should make this decision with mutation, action, or b...
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