The core parts of JavaScript are: 1. ECMAScript (syntax and data types); 2. BOM (browser interaction, including DOM, events, windows); 3. DOM (web page document representation, which can operate and modify documents) ); 4. Auxiliary libraries (standard libraries and third-party libraries); 5. JavaScript engine (execute code, optimize performance).
The composition of JavaScript and the role of each part
JavaScript is a cross-platform scripting language, consisting of the following Core part consists of:
Core part
Auxiliary library
Engine
The role of each part
ECMAScript:Specifies the syntax and behavior of JavaScript. It defines variables, functions, objects, and control flow structures.
BOM:Allows JavaScript to interact with the browser. It provides access to windows, documents, and browser native features.
DOM:Provides a way to programmatically manipulate web documents. Scripts can use the DOM to create, modify, and delete elements, as well as get and set properties.
Standard Library:Provides utility functions that allow developers to easily perform common tasks such as array operations, string manipulation, and mathematical calculations.
Third-party libraries:Extend the functionality of JavaScript, allowing developers to solve more complex problems such as data visualization, network interaction, and form validation.
JavaScript Engine:Execute JavaScript code and implement it as operations in the browser or runtime environment. It optimizes code and ensures fast execution.
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