ReasonJun

In JavaScript, the Timer API provides functions and methods to schedule and manage timers. Timers allow you to execute code at specified intervals or after a certain delay. The Timer API consists of two main functions: setTimeout and setInterval, along with their corresponding methods to clear or cancel the timers: clearTimeout and clearInterval. Here's an overview of the Timer API in JavaScript..

//? document.createElement() // Creates and returns a new html element that only exists in memory. const divEl = document.createElement('div'); console.log(divEl); //? E.prepend() / E.append() // Inserts a node as the first or last child of an element. const parentEl = document.querySelector('.parent'); const el = document.createElement('div'); el.textContent = 'Hello'; parentEl.prepend(new Comm..

Search //? document.getElementById() // Returns the element retrieved by the value of the HTML `id` attribute. // If multiple elements are found, only the first element found is returned. // If there are no search results, return null. const el = document.getElementById('child2'); console.log(el); //? document.querySelector() // Returns one element searched for with 'css selector'. // If multipl..

The DOM (Document Object Model) API in JavaScript provides a way to interact with HTML and XML documents. It represents the structure of a document as a tree-like structure, where each node in the tree corresponds to a part of the document, such as elements, attributes, text, etc. The DOM API allows you to manipulate the structure, content, and styling of web documents dynamically. Here are some..

// this binding // 'this' is dynamically determined by the caller! function Hello(name) { this.name = name; this.printName = function () { console.log(`My name is ${this.name}`); }; } function YourName(name) { this.name = name; this.printName = function () { console.log(`Your name is ${this.name}`); }; } const youjun = new Hello('youjun'); const neo = new YourName('neo'); youjun.printName(); // ..

In JavaScript, the this keyword refers to the context in which a function is executed. It is a special keyword that provides a reference to the object on which a method or function is being invoked. The value of this is determined dynamically at runtime based on how a function is called, rather than being lexically bound during the function's definition. The behavior of this depends on the invoc..