window、BOM、 document、 DOM

window: As the name suggests, the window, the browser window. Window is an instance of the object constructor.

Properties and methods that include a browser, such as a screen, location, history, setInterval like.

BOM: BrowserObjectModel; browser object model; In order to deal with browser-related.

window is a top-level object of the BOM.

 

document: the document object, a html page is a document object. It contains <! DOCTYPE html> declaration.

You can access the document content within the property provided by a variety of methods and document objects. Inside each tag is a DOM object.

const htmlDOM = document.documentElement; 
const rooElement = document.getElementById('root');

DOM: DocumentObjectModel. Document Object Model.

The document object is a top-level object the DOM.

 

Further comprising a window object document object.

window.document === document