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Javascript api mdn This article teaches you what you'll need to know. A Browser API can extend the functionality of a web browser. Mar 20, 2025 · With the Fetch API, you make a request by calling fetch(), which is available as a global function in both window and worker contexts. localStorage – introduce you to the Storage type and show you how to use localStorage to store the client-side data. subtle Read only Secure context. 6 days ago · Application Programming Interfaces (APIs) are programming features for manipulating different aspects of the browser and operating system the site is running on, or manipulating data from other websites or services. Learn to run scripts in the browser. Section 1. Mar 13, 2025 · This interface implements properties defined on RandomSource. The entire language is described here in detail. 4 days ago · The HTMLFormElement interface represents a <form> element in the DOM. Fired when the fragment identifier of the URL has changed (the part of the URL beginning with and following the # symbol). sendBeacon() methods. request. send() or navigator. 6 days ago · Strings are useful for holding data that can be represented in text form. 6 days ago · Promise. Jul 24, 2024 · The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch(), XMLHttpRequest. This is a successor to previous web platform features such as the History API and window. It uses the same format a form would use if the encoding type were set to "multipart/form-data". 6 days ago · The Navigation API provides the ability to initiate, intercept, and manage browser navigation actions. WebTransport is a versatile, low-level API that provides backpressure and many other features not supported by either WebSocket or WebSocketStream , such as unidirectional streams, out-of-order delivery, and unreliable data transmission via datagrams. Feb 9, 2025 · Additionally, the WebTransport API is expected to replace the WebSocket API for many applications. WebExtension 用の JavaScript API は拡張機能のバックグラウンドスクリプトと、その他の拡張機能にバンドルした文書 (ブラウザーアクションやページアクションポップアップやサイドバーやオプションページや新規タブページを含む) で使用できます。いくつかの API は拡張機能のコンテンツ 6 days ago · hashchange. Oct 17, 2024 · This interface also inherits methods of its parent, EventTarget. Crypto. It allows access to—and, in some cases, modification of—aspects of the form, as well as access to its component elements. You pass it a Request object or a string containing the URL to fetch, along with an optional argument to configure the request. Mar 5, 2025 · Depending on the document's type (e. Collectively, they comprise the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, date and time formatting, and more. These Web APIs allow you to use the modern functions provided by the web browsers in your web applications. Visit Mozilla Web API는 보통 JavaScript와 함께 사용하지만, 항상 그렇지는 않습니다. pagehide. CSS. g. 6 days ago · The Web Speech API provides two distinct areas of functionality — speech recognition, and speech synthesis (also known as text to speech, or tts) — which open up interesting new possibilities for accessibility, and control mechanisms. Sent when the browser hides the current document while in the process of switching to displaying in its place a different document from the session's history. Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation. Some of the most-used operations on strings are to check their length, to build and concatenate them using the + and += string operators, checking for the existence or location of substrings with the indexOf() method, or extracting substrings with the substring() method. Mar 13, 2025 · The Fetch API provides an interface for fetching resources (including across the network). , HTML, XML, SVG, …), a larger API is available: HTML documents, served with the "text/html" content type, also implement the HTMLDocument interface, whereas XML and SVG documents implement the XMLDocument interface. JavaScript 参考提供了有关 JavaScript 语言的内容资料库。这里详细描述了整个语言。在编写 JavaScript 代码时，你经常会参考这些页面（因此，标题为“JavaScript 参考”）。 JavaScript 语言旨在用于更加广泛的环境，不论是浏览器、服务端脚本还是其他类似的环境。 Jan 20, 2025 · The Intl namespace object contains several constructors as well as functionality common to the internationalization constructors and other language sensitive functions. Mar 13, 2025 · The Response interface of the Fetch API represents the response to a request. It allows you to fetch data from external sources and integrate it into your web applications. JavaScript. . You can create a new Response object using the Response() constructor, but you are more likely to encounter a Response object being returned as the result of another API operation—for example, a service worker FetchEvent. getDevices() Experimental Returns a Promise that resolves with an array of connected HID devices that the user has previously been granted access to in response to a requestDevice() call. As you write JavaScript code, you'll refer to these pages often (thus the title "JavaScript reference"). JavaScript リファレンスは、 JavaScript 言語に関する事実の保管庫として機能します。言語全体がここで詳細に記述されています。 JavaScript のコードを書いていると、これらのページをよく参照することになります（だから「JavaScript リファレンス」という題名なのです）。 Jul 25, 2024 · Provides access to the HighlightRegistry used to style arbitrary text ranges using the CSS Custom Highlight API. 6 days ago · The Web Audio API provides a powerful and versatile system for controlling audio on the Web, allowing developers to choose audio sources, add effects to audio, create audio visualizations, apply spatial effects (such as panning) and much more. Nov 3, 2023 · Calling an API (Application Programming Interface) in JavaScript is a fundamental action that web developers need to know how to perform. respondWith, or a simple fetch(). Apr 2, 2025 · If you have already compiled a module from another language using tools like Emscripten, or loaded and run the code yourself, the next step is to learn more about using the other features of the WebAssembly JavaScript API. location, which solves their shortcomings and is specifically aimed at the needs of single-page applications (SPAs). This module covers common aspects of some of the most common classes of Web APIs that we haven't previously covered in any kind of detail, providing a useful grounding for those ウェブのコードを書く時は、数多くの Web API が利用できます。以下に、ウェブアプリやサイトを開発する際に利用することができる可能性があるすべてのインターフェイス（オブジェクト型）のリストを挙げます。 5 days ago · The Request interface of the Fetch API represents a resource request. まずは API を高い視点から見ていきます — これは何なのか、どう働くのか、あなたのコードでどう使うのか、どういう風に作られているのか? また様々なクラスの API は何なのか、どのような使い方があるのかも見ていきます。 JavaScript API documentation with instant search, offline support, keyboard shortcuts, mobile version, and more. You can create a new Request object using the Request() constructor, but you are more likely to encounter a Request object being returned as the result of another API operation, such as a service worker FetchEvent. This article provides a simple introduction to both areas, along with demos. paintWorklet Experimental Secure context Provides access to the Worklet responsible for all the classes related to painting. It can also examine an application's history entries. prototype. A Server API can extend the functionality of a web server. Dec 15, 2022 · URL API helps users access and manipulate the URL in the Javascript, it has two interfaces URL and URLSearchParams, and also we can use it to access, change and query URLs (URL API — Web APIs | Mar 7, 2025 · The JavaScript reference serves as a repository of facts about the JavaScript language. Cookies – learn about HTTP cookies and how to use JavaScript to manage cookies more effectively. Client Storage. In this tutorial A Web API is an application programming interface for the Web. Returns a SubtleCrypto object providing access to common cryptographic primitives, like hashing, signing, encryption, or decryption. catch() Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled. 6 days ago · First up, we'll start by looking at APIs from a high level — what are they, how do they work, how to use them in your code, and how are they structured? We'll also take a look at what the different main classes of APIs are, and what kind of uses they have. mnr doa liwx gngzif fufvj xkka ttqsziyu rfof rcbrpfmw kks ylag bin rrscn oanlbp woqs