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  1. en.wikipedia.org › wiki › JavaScriptJavaScript - Wikipedia

    JavaScript ( ⫽ ˈdʒɑːvəskrɪpt ⫽ ), often abbreviated as JS, is a programming language and core technology of the Web, alongside HTML and CSS. 99% of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.

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      This article is within the scope of WikiProject Computing, a...

    • Brendan Eich

      He created the JavaScript programming language and...

    • Wikipedia

      User scripts have unlimited access to your account by their...

    • Browser War

      A timeline of web browsers The most used web browser by...

    • Document Object Model

      The Document Object Model (DOM) is a cross-platform and...

    • Duck Typing

      In computer programming, duck typing is an application of...

    • Runtime System

      In computer programming, a runtime system or runtime...

    • Dynamic

      Dynamic type checking is the process of verifying the type...

    • Just-In-Time Compilation

      For instance Firefox's JIT compiler for Javascript...

    • JScript

      JScript is Microsoft's legacy dialect of the ECMAScript...

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    • Syntax
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    • Differences Between Java and Javascript
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    JavaScript is typically inserted into HTML when used on the web, either directly in the file in an HTML tag, or linkedto a separate file containing the script. JavaScript, as a full featured scripting language, can be used to provide functionality to a website. Examples include: 1. Using AJAXin order to load content without refreshing the website. ...

    A JavaScript program is made of a collection of instructions called "statements". A semicolonmarks the end of a statement, and allows multiple statements to be placed on the same line. However, it is typical to write each statement on its own line to keep a program file readable. Variables can be defined in several ways. In an older version named "...

    The script below prints "Example" on the screen. The lines that start with //are comments, which are used to describe the actions of the program. The code above alerts "Hello " + name. If you want to put JavaScript in your HTML, you put it between an opening tag. These tags mean that whatever is between them is a scri...

    In Java, to define a variable, you have to say what type of variable it is: a number, a word, a letter, or more. In JavaScript, this is not necessary.
    In JavaScript, functions are stored as variables (unlike Java). This makes the following code okay in JavaScript:
    Learn JavaScript Archived 2012-07-16 at the Wayback Machineon the Mozilla Developer Center
    Video - Firefox 2 and Javascript with Mozilla Corp and JavaScript creator Brendan Eich Archived 2007-09-27 at the Wayback Machine
  2. A JavaScript engine is a software component that executes JavaScript code. The first JavaScript engines were mere interpreters, but all relevant modern engines use just-in-time compilation for improved performance. [1] JavaScript engines are typically developed by web browser vendors, and every major browser has one.

  3. JavaScript在过去只支持使用var关键字来定义变量的函数作用域,但ECMAScript 2015中加入了let关键字来支持块级作用域 。这意味着JavaScript现在既支持函数作用域又支持块级作用域。JavaScript还支持自动在语句末添加分号,允许忽略语句末尾的分号。 弱类型

  4. Jun 9, 2024 · JavaScript is a single-threaded, synchronous programming and scripting language widely used in web development. It plays a crucial role in both front-end and back-end development, enabling dynamic and interactive user experiences. Unlike compiled languages, JavaScript is interpreted through web browsers, making it highly accessible and versatile.

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  5. ja.wikipedia.org › wiki › JavaScriptJavaScript - Wikipedia

    JavaScriptはWebブラウザ Netscape Navigator に起源を持ち、現在では様々な用途に利用されるプログラミング言語である。. JavaScriptの言語仕様は ECMAScript として標準化され、実装は各種のJavaScriptエンジンによって提供されている。. JavaScriptエンジンの例として Chromium ...

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  7. This WikiProject is mesopedic, meaning that it operates on articles in the encyclopedia and on pages in project space. Basically, we create and maintain articles related to JavaScript, and do the same for every page in the Wikipedia community about using and creating user scripts on Wikipedia. Some members actively build upon the collection of ...

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