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.

A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs (same rules as variables).

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content. To select an HTML element, JavaScript most often uses the document.getElementById() method. This JavaScript example writes "Hello JavaScript!"

In JavaScript, the this keyword refers to an object. The this keyword refers to different objects depending on how it is used: In an object method, this refers to the object .

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Types of JavaScript Operators. There are different types of JavaScript operators: Arithmetic Operators; Assignment Operators; Comparison Operators; String Operators; Logical Operators; Bitwise Operators; Ternary Operators; Type Operators

You should use objects when you want the element names to be strings (text). You should use arrays when you want the element names to be numbers.

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; JavaScript can remove existing HTML elements and attributes

When you search for data in a text, you can use this search pattern to describe what you are searching for. A regular expression can be a single character, or a more complicated pattern. Regular expressions can be used to perform all types of text search and text replace operations.

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