Quick Reference to JavaScript Objects

his page provides an alphabetized list for JavaScript’s:

• built-in objects
• browser-specific objects
• object’s properties
• object’s methods

JavaScript Object	JavaScript Properties	JavaScript Methods
anchor	name	–
	text	–
	x	–
	y	–
area	hash	–
	host	–
	hostname	–
	href	–
	pathname	–
	port	–
	protocol	–
	search	–
	target	–
array	constructor	concat(), join(), pop(), push(), reverse(), shift(), slice(), splice(), sort(), toSource(), toString(), unshift(), valueOf()
	index
	input
	length
	prototype
Boolean	constructor	toSource(), toString(), valueOf()
	prototype
button	form	blur(), click(), focus(), handleEvent()
	name
	type
	value
checkbox	checked	blur(), click(), focus(), handleEvent()
	defaultChecked
	form
	name
	type
	value
Date	constructor	getDate(), getDay(), getFullYear(), getHours(), getMilliseconds(), getMinutes(), getMonth(), getSeconds(), getTime(), getTimezoneOffset(), getUTCDate(), getUTCDay(), getUTCFullYear(), getUTCHours(), getUTCMilliseconds(), getUTCMinutes(), getUTCMonth(), getUTCSeconds(), getYear(), parse(), setDate(), setFullYear(), setHours(), setMilliseconds(), setMinutes(), setMonth(), setSeconds(), setTime(), setUTCDate(), setUTCFullYear(), setUTCHours(), setUTCMilliseconds(), setUTCMinutes(), setUTCMonth(), setUTCSeconds(), setYear(), toGMTString(), toLocaleString(), toSource(), toString(), toUTCString(), UTC(), valueOf()
	prototype
document	alinkColor	captureEvents(), close(), getSelection(), handleEvent(), open(), releaseEvents(), routeEvent(), write(), writeln()
	anchors
	applets
	bgColor
	classes
	cookie
	domain
	embeds
	fgColor
	forms
	height
	images
	lastModified
	layers
	linkColor
	links
	plugins
	referrer
	tags
	title
	URL
	vlinkColor
	width
event	data	–
	height	–
	layerX	–
	layerY	–
	modifiers	–
	pageX	–
	pageY	–
	screenX	–
	screenY	–
	target	–
	type	–
	which	–
	width	–
	x	–
	y	–
fileUpload	form	blur(), focus(), handleEvent(), select()
	name
	type
	value
form	action	handleEvent(), reset(), submit()
	elements
	encoding
	length
	method
	name
	target
function	arguments	apply(), call(), toSource(), toString(), valueOf()
	arguments.callee
	arguments.caller
	arguments.length
	arity
	constructor
	length
	prototype
hidden	form	–
	name	–
	type	–
	value	–
history	current	back(), forward(), go()
	length
	next
	previous
image	border	handleEvent()
	complete
	height
	hspace
	lowsrc
	name
	src
	vspace
	width
layer	above	captureEvents(), handleEvent(), load(), moveAbove(), moveBelow(), moveBy(), moveTo(), moveToAbsolute(), releaseEvents(), resizeBy(), resizeTo(), routeEvent()
	background
	bgColor
	below
	clip.bottom
	clip.height
	clip.left
	clip.right
	clip.top
	clip.width
	document
	left
	name
	pageX
	pageY
	parentLayer
	siblingAbove
	siblingBelow
	src
	top
	visibility
	window
	x
	y
	zIndex
link	hash	handleEvent()
	host
	hostname
	href
	pathname
	port
	protocol
	search
	target
	text
	x
	y
location	hash	reload(), replace()
	host
	hostname
	href
	pathname
	port
	protocol
	search
Math	E	abs(), acos(), asin(), atan(), ceil(), cos(), exp(), floor(), log(), max(), min(), pow(), random(), round(), sin(), sqrt(), tan()
	LN10
	LN2
	LOG10E
	LOG2E
	PI
	SQRT1_2
	SQRT2
mimeType	description	–
	enabledPlugin	–
	suffixes	–
	type	–
navigator	appCodeName	javaEnabled(), plugins.refresh(), preference(), savePreferences(), taintEnabled()
	appName
	appVersion
	language
	mimeTypes
	platform
	plugins
	userAgent
Number	constructor	toSource(), toString(), valueOf()
	MAX_VALUE
	MIN_VALUE
	NaN
	NEGATIVE_INFINITY
	POSITIVE_INFINITY
	prototype
Object	constructor	eval(), toSource(), toString(), unwatch(), valueOf(), watch()
	prototype
option	defaultSelected	–
	index	–
	length	–
	selected	–
	text	–
	value	–
password	defaultValue	blur(), focus(), handleEvent(), select()
	form
	name
	type
	value
plugin	description	–
	filename	–
	length	–
	name	–
radio	checked	blur(), click(), focus(), handleEvent()
	defaultChecked
	form
	name
	type
	value
RegExp	$1...$9	compile(), exec(), test(), toSource(), toString(), valueOf()
	$_
	$*
	$&
	$+
	$'
	$'
	constructor
	global
	ignoreCase
	input
	lastIndex
	lastMatch
	lastParen
	leftContext
	multiline
	prototype
	rightContext
	source
reset	form	blur(), click(), focus(), handleEvent()
	name
	type
	value
screen	availHeight	–
	availLeft	–
	availTop	–
	availWidth	–
	colorDepth	–
	height	–
	pixelDepth	–
	width	–
select	form	blur(), focus(), handleEvent()
	length
	name
	options
	selectedIndex
	type
String	constructor	anchor(), big(), blink(), bold(), charAt(), charCodeAt(), concat(), fixed(), fontcolor(), fontsize(), fromCharCode(), indexOf(), italics(), lastIndexOf(), link(), match(), replace(), search(), slice(), small(), split(), strike(), sub(), substr(), substring(), sup(), toLowerCase(), toSource(), toString(), toUpperCase(), valueOf()
	length
	prototype
style	align	borderWidths(), margins(), paddings()
	backgroundColor
	backgroundImage
	borderBottomWidth
	borderColor
	borderLeftWidth
	borderRightWidth
	borderStyle
	borderTopWidth
	clear
	color
	display
	fontFamily
	fontSize
	fontStyle
	fontWeight
	lineHeight
	listStyleType
	marginBottom
	marginLeft
	marginRight
	marginTop
	paddingBottom
	paddingLeft
	paddingRight
	paddingTop
	textAlign
	textDecoration
	textIndent
	textTransform
	whiteSpace
	width
submit	form	blur(), click(), focus(), handleEvent()
	name
	type
	value
text	defaultValue	blur(), focus()
	form
	name
	type
	value
textarea	defaultValue	blur(), focus(), handleEvent(), select()
	form
	name
	type
	value
window	closed	alert(), atob(), back(), blur(), btoa(), captureEvents(), clearInterval(), clearTimeout(), close(), confirm(), crypto.random(), crypto.signText(), disableExternalCapture(), find(), focus(), forward(), handleEvent(), home(), moveBy(), moveTo(), open(), print(), prompt(), releaseEvents(), resizeBy(), resizeTo(), routeEvent(), scroll(), scrollBy(), scrollTo(), setHotKeys(), setInterval(), setResizable(), setTimeout(), setZOptions(), stop()
	crypto
	defaultStatus
	document
	frames
	history
	innerHeight
	innerWidth
	length
	location
	locationbar
	menubar
	name
	offscreenBuffering
	opener
	outerHeight
	outerWidth
	pageXOffset
	pageYOffset
	parent
	personalbar
	screenX
	screenY
	scrollbars
	self
	status
	statusbar
	toolbar
	top
	window

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Notes

• Objects: Core JavaScript objects (Array, Date, Math, etc.) and browser-specific objects (window, document, navigator, etc.).
• Properties: Attributes of objects (e.g., length, prototype).
• Methods: Functions that objects can execute (e.g., push(), getElementById()).

Here’s a structured table listing JavaScript’s built-in objects, browser-specific objects, along with their properties and methods:

Category	Object/Property/Method	Description
Built-in Objects	Array	Used to store multiple values in a single variable.
	Array.length	Returns the number of elements in an array.
	Array.push()	Adds one or more elements to the end of an array.
	Date	Represents date and time functionality.
	Date.now()	Returns the number of milliseconds since January 1, 1970.
	Math	Provides mathematical functions and constants.
	Math.random()	Returns a random number between 0 and 1.
	String	Represents and manipulates a sequence of characters.
	String.length	Returns the length of a string.
	String.toUpperCase()	Converts a string to uppercase letters.
	Object	Base object for all JavaScript objects.
	Object.keys()	Returns an array of a given object’s property names.
Browser Objects	window	Represents the browser’s window (global object in browsers).
	window.innerHeight	Returns the height of the window’s content area.
	window.alert()	Displays an alert box with a message.
	document	Represents the web page loaded in the window (DOM entry point).
	document.getElementById()	Returns the element with the specified ID.
	navigator	Provides browser and OS information.
	navigator.userAgent	Returns the user-agent header sent by the browser.
	location	Provides current URL and navigation methods.
	location.reload()	Reloads the current page.
Properties	length (Array/String)	Returns the number of elements/characters.
	prototype (Object)	Allows adding properties/methods to all instances of an object.
Methods	push() / pop() (Array)	Adds/removes elements from the end of an array.
	charAt() (String)	Returns the character at a specified index.
	setTimeout() (window)	Calls a function after a specified delay.
	addEventListener() (DOM)	Attaches an event handler to an element.

Notes:

• Built-in Objects: Core JavaScript objects available in any JS environment.
• Browser Objects: Provided by the browser (e.g., window, document).
• Properties: Characteristics of objects (e.g., length, prototype).
• Methods: Actions objects can perform (e.g., push(), alert()).

Here’s a detailed breakdown of JavaScript objects, properties, and methods in a structured table format:

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1. Built-in JavaScript Objects

Object	Description	Key Properties	Key Methods
Array	Stores ordered collections of values.	length (number of elements)	push(), pop(), shift(), unshift(), slice(), splice()
Date	Handles date and time operations.	Date.now (current timestamp)	getFullYear(), getMonth(), getDate(), toISOString()
Math	Provides mathematical functions.	Math.PI, Math.E (constants)	random(), floor(), ceil(), max(), min()
String	Represents and manipulates text.	length (string length)	charAt(), concat(), includes(), toUpperCase(), trim()
Object	Base object for all JS objects.	prototype (inheritance)	keys(), values(), entries(), assign()
Number	Wrapper for numeric values.	MAX_SAFE_INTEGER, NaN	toFixed(), toString(), parseInt()
Boolean	Represents true or false.	(None)	valueOf()
RegExp	Handles regular expressions.	source (regex pattern)	test(), exec()
Function	Represents a function.	length (number of args)	call(), apply(), bind()
Promise	Handles asynchronous operations.	Promise.length	then(), catch(), finally(), all(), race()
JSON	Parses and stringifies JSON data.	(None)	parse(), stringify()

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2. Browser-Specific Objects

Object	Description	Key Properties	Key Methods
window	Global object in browsers.	innerWidth, innerHeight	alert(), setTimeout(), fetch()
document	Represents the DOM (web page).	title, URL, body	getElementById(), querySelector(), addEventListener()
navigator	Provides browser/OS info.	userAgent, platform	geolocation.getCurrentPosition()
localStorage	Stores data persistently in the browser.	length (number of items)	setItem(), getItem(), removeItem()
history	Manages browser session history.	length (history entries)	back(), forward(), pushState()
location	Provides URL info and navigation.	href, hostname, pathname	reload(), assign(), replace()
screen	Provides display info.	width, height, colorDepth	(None)

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3. Common Object Properties & Methods

Category	Name	Description
Properties	prototype	Used to add properties/methods to all instances of an object.
	length (Array/String)	Returns the number of items/chars.
	constructor	References the object’s constructor function.
Methods	toString()	Converts an object to a string.
	valueOf()	Returns the primitive value of an object.
	hasOwnProperty()	Checks if a property belongs to the object (not inherited).
	isPrototypeOf()	Checks if an object exists in another’s prototype chain.

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4. Commonly Used Methods by Category

Category	Method	Example Use
Array	map()	[1,2,3].map(x => x * 2) → [2,4,6]
	filter()	[1,2,3].filter(x => x > 1) → [2,3]
	reduce()	[1,2,3].reduce((a,b) => a + b) → 6
String	split()	"a,b,c".split(",") → ["a","b","c"]
	replace()	"Hello".replace("H", "J") → "Jello"
Object	Object.freeze()	Prevents modifying an object.
	Object.seal()	Prevents adding/deleting properties.

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Summary

• Built-in Objects: Core JS objects (Array, Date, Math, etc.).
• Browser Objects: Only available in browsers (window, document, localStorage, etc.).
• Properties: Describe object characteristics (length, prototype).
• Methods: Actions objects can perform (push(), getElementById()).