How to use document in js
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
##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:
- Get and modify DOM elements
- 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!";
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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