20241120_2 기초2

Object.values() 

creates an array from the property values

Object.entries()

makes it simple to use objects in loops

JSON.stringify()

objects can be converted to a string with JSON method

 

Object Constructor Functions

object type we use an object constructor function.

ex )

function Person(first, last, age, eye) {
  this.firstName = first;
  this.lastName = last;
  this.age = age;
  this.eyeColor = eye;
}

const myFather = new Person("John", "Doe", 50, "blue");

 

Adding a Property to a Constructor

Person.prototype.nationality = "English";   OK

Person.nationality = "English";                  CAN NOT

 

Built-in JavaScript Constructors

new Object()   // A new Object object object literals {}
new Array()    // A new Array object  array literals []
new Map()      // A new Map object 
new Set()      // A new Set object
new Date()     // A new Date object
new RegExp()   // A new RegExp object  pattern literals /()/
new Function() // A new Function object function expressions () {}

 

HTML Events

EventDescription

onchange	An HTML element has been changed
onclick	The user clicks an HTML element
onmouseover	The user moves the mouse over an HTML element
onmouseout	The user moves the mouse away from an HTML element
onkeydown	The user pushes a keyboard key
onload	The browser has finished loading the page

The list is much longer

Escape Characters

\b	Backspace
\f	Form Feed
\n	New Line
\r	Carriage Return
\t	Horizontal Tabulator
\v	Vertical Tabulator

 

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