JavaScript mainly consists of the following parts: syntax keywords, identifiers, operators, statements, data types, objects, functions, arrays, DOM, event handling and Web API, which allows JavaScript to access and modify HTML elements , respond to user input or page state changes, and interact with external systems.
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What does JavaScript consist of?
JavaScript is mainly composed of the following parts:
1. Syntax
- Keywords (for example: var, const, let )
- Identifiers (names of variables, functions, etc.)
- Operators (arithmetic, logical, assignment, etc.)
- Statements (conditional statements, loop statements, etc.)
2. Data type
- Primitive type (for example: number, string, boolean, undefined, null)
- Object type (for example : Array, Object, Function)
3. Object
- A collection of properties and methods
- can create and modify itself The object
- uses a primitive type or other object as the value
4. Function
- Code that accepts input and produces output Blocks
- can be reused and passed as parameters
- Use functions to implement complex logic
5. Arrays
- A collection of ordered elements
- You can access and modify elements using indexes
- Can store various types of data
6. DOM
- Document Object Model
- Represents the tree structure of the HTML document
- Allows JavaScript to access and modify HTML elements
7. Event handling
- Response to user input or page state changes
- Use event listeners to capture and handle events
- For example: click, mouse movement, page load
8. Web API
- Provides access to browser or operating system functions
- Includes APIs for geolocation, file operations, and network communications
- Allows JavaScript to interact with external systems
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