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W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. The reference contains examples for all properties, methods and events, and is continuously updated according to the latest web standards.
JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997. ECMA-262 is the official name of the standard. ECMAScript is the official name of the language. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
JavaScript is the Programming Language for the Web. JavaScript can update and change both HTML and CSS. JavaScript can calculate, manipulate and validate data.
A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it).
Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its "elements". In this example, person[0] returns John:
JavaScript supports different kinds of loops: for - loops through a block of code a number of times. for/in - loops through the properties of an object. for/of - loops through the values of an iterable object. while - loops through a block of code while a specified condition is true.
The HTML DOM Tree of Objects. With the object model, JavaScript gets all the power it needs to create dynamic HTML: JavaScript can change all the HTML elements in the page. JavaScript can change all the HTML attributes in the page. JavaScript can change all the CSS styles in the page.
Variables are Containers for Storing Data. JavaScript Variables can be declared in 4 ways: Automatically. Using var. Using let. Using const. In this first example, x, y, and z are undeclared variables. They are automatically declared when first used:
ECMAScript 2015, also known as ES6, introduced JavaScript Classes. JavaScript Classes are templates for JavaScript Objects.
JavaScript is the programming language of the Web. JavaScript is easy to learn. This tutorial will teach you JavaScript from basic to advanced. Start to learn JavaScript with this tutorial: https://www.w3schools.com/js/default.asp. 100 out of 122 found this helpful.