How to use document in js-JS Tutorial-php.cn

Document is a global object in JavaScript used to interact with HTML documents. The main uses include: Obtaining and modifying DOM elements Listening for events and handling user interaction Accessing page metadata Storing and retrieving data Usage: The document object is a global variable and can be used directly. Attributes include documentElement, body, head, cookie, location, title. The main methods include getElementById, getElementsByTagName, createElement, addEventListener, removeEve

How to use document in js

##Usage of document in JavaScript

document object Is a JavaScript global object provided by the browser, which represents the currently opened HTML document. It provides a set of methods and properties for interacting with the DOM (Document Object Model) to perform operations such as page manipulation, form validation, or handling user interaction.

Main purpose:

Listen to events and handle user interactions
Access page elements Data (such as title, URL)
Storage and retrieval of data (via cookie, localStorage)

Usage:

document object automatically Becomes a global variable for all browser windows. Therefore, you can use it directly like this:

document.getElementById("myElement").innerHTML = "Hello World!";

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Main attribute:

documentElement:Points to the root element of the HTML document ( html).
body:Points to the body element (body) of the HTML document.
head:Points to the head element (head) of the HTML document.
cookie:A string containing the cookie for the current page.
location:Provides information about the current page URL and location.
title:Get or set the title of the page.

Main method:

getElementById(id):Get the element in the page based on its ID.
getElementsByTagName(name):Get all matching elements in the page based on their names.
createElement(element):Create a new element.
addEventListener(event, listener):Listen to specific events on elements.
removeEventListener(event, listener):Remove the event listener.
querySelector(selector):Use CSS selector to get elements in the page.
querySelectorAll(selector):Use a CSS selector to get all matching elements in the page.

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