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Examples

[...array]

var a = [1,2,3,4,5]

[...a] //Equal to [1,2,3,4,5]

`Hello ${a}`

var a = "John" //Equal to "Hello John"

abs()

Math.abs(-1.234)

add()

var unique = new Set([1,2,3,4,5])

alert()

alert("happy new year")

acos()

Math.acos(0.4) //Equal to 1.1592794807274085

acosh()

Math.acosh(4) //Equal to 2.0634370688955608

addEventListener()

altkey

function isKeyPressed(event) { if (event.altKey) { document.getElementsByTagName("p")[0].style.color = "#ff0000"; } else { alert("The ALT key was NOT pressed!"); } }

appendChild

appCodeName

navigator.appCodeName

appName

navigator.appName

appVersion

navigator.appVersion

asin()

Math.asin(-0.4) //Equal to -0.41151684606748806

asinh()

Math.asinh(20) //Equal to 3.6895038689889055

assign()

const target = { a: 1, b: 2 }; const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target); // expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget); // expected output: Object { a: 1, b: 4, c: 5 }

atan()

Math.atan(20) //Equal to 1.5208379310729538

atanh()

Math.atanh(0.2) //Equal to 0.2027325540540822

attribute

availHeight

screen.availHeight

boolean? a : b

4===5? true : false //Equal to false

break

cbrt()

Math.cbrt(8) //Equal to 2

ceil()

Math.ceil(2.145) //Equal to 3

charAt(num)

"nop".charAt(1) //Equal to "o"

childNodes

var c = document.body.childNodes;

c[0];

clearInterval()

clearInterval(setInterval(alert("Hi")),3000)

click

colorDepth

screen.colorDepth

confirm()

confirm("happy new year")

concat()

[1,2,3,4].concat([5],[6]) //Equal to [1,2,3,4,5,6]

console.log()

console.log("1+2")

const

const a = "apple" //globle

continue

copyWithin()

[1,2,3,4,5].copyWithin(2,1) //Equal to [1,2,2,3,4]

cos()

Math.cos(32) //Equal to 0.8342233605065102

cosh()

Math.cosh(32) //Equal to 39481480091340.34

cost()

Math.cost()

createElement()

var para = document.createElement("p")

createTextNode()

document.createTextNode("This is new.")

close()

window.close()

Date()

var a = new Date()

dblclick

do……while

var i = 0

do{

document.write(i)

i++

}while(i<5)

E

Math.E //Equal to 2.718281828459045

endsWith

"happy".endsWith("y") //Equal to true

entries()

arrSet = {a:1,b:2,c:3}

Object.entries(arrSet) //Equal to [["a",1],["b",2],["c",3]]

eval()

eval("1+2") //Equal to 3

every()

[1,2,3,4,5].every(x => x<4) //Equal to false

exp()

Math.exp(20) //Equal to 485165195.4097903

fill()

[1,2,3,4,5].fill("h") //Equal to ["h","h","h","h","h"]

find()

[1,2,3,4,5].find(x => x>2) //Equal to 3

findIndex()

[1,2,3,4,5].find(x => x>2) //Equal to 2

flat()

[1,2,3,[4,5]].flat() //Equal to [1,2,3,4,5]

floor()

Math.floor(2.145) //Equal to 2

freeze()

Object.freeze(obj)

forEach()

[1,2,3,4,5].forEach((x,y)=>console.log(y+ "" +x))

for loop

for(i=0; i<6; i++){}

for……in

for……of

from()

Array.from("12") //Equal to ["1","2"]

function(){}

function(){

return "happy new year";

}

\\Equal to () => "happy new year"

getElementById(id)

document.getElementById("demo")

getElementsByTagName(name)

getElementsByTagName("p")

getElementsByClassName(name)

getElementsByTagName("demo")

getTime()

new Date().getTime() //Equal to time from 1970.1.1

getFullYear()

new Date().getFullYear() //Equal to 2020

setFullYear()

new Date().setFullYear(2019) //Equal to 2019yr

getUTCFullYear()

new Date().getUTCFullYear() //Equal to 2020

setUTCFullYear()

getMonth()

new Date().getMonth() //Equal to Month -1

setMonth()

getUTCMonth()

setUTCMonth()

getDate()

new Date().getDate() //Equal to today number

setDate()

getNamedItem()

var x = btn.attributes.getNamedItem("class").value

getUTCDate()

setUTCDate()

getDay()

new Date().getDay() //Equal to a week number

setDay()

getUTCDay()

setUTCDay()

getHours()

new Date().getHours() //Equal to this hour number

setHours()

getUTCHours()

setUTCHours()

getMinutes()

new Date().getMinutes() //Equal to this minute number

setMinutes()

getUTCMinutes()

setUTCMinutes()

getSeconds()

new Date().getSeconds() //Equal to this seconds number

setSeconds()

getUTCSeconds()

setUTCSeconds()

getMilliseconds()

new Date().getMilliseconds() //Equal to this milliseconds number

setMilliseconds()

getUTCMilliseconds()

setUTCMilliseconds()

has()

height

screen.height //Equal to screen height

hypot()

Math.hypot(3,4) //Equal to 5

includes()

[1,2,3,4,5].includes(5) //Equal to true

indexOf()

"abcde".indexOf("b") //Equal to 1

Infinity

innerHeight

window.innerHeight //Equal to browser window height

innerHTML

innerWidth

window.innerWidth //Equal to browser window width

insertBefore()

element.insertBefore(para,child);

isArray()

Array.isArray([1,2,3,4,5]) //Equal to true

isFinite

isFinite(10/0)

isInteger()

Number.isInteger(10/2) //Equal to true

isNaN()

isNaN("123") //Equal to false

isSafeInteger()

Number.isSafeInteger("2") //Equal to false

item()

var x = a.attributes.item(1).value

if……else if……

if(x>1){

return true;

}else{

return false;

}

join()

[1,2,3,4,5].join("") //Equal to "12345"

lang

language

navigator.language

languages

navigator.languages

lastIndexOf()

[1,2,3,4,5].lastIndexOf(5) //Equal to 4

length

[1,2,3].length //Equal to 3

let

let a = "apple" //not global

LN2

Math.LN2 //Equal to 0.6931471805599453

LN10

Math.LN10 //Equal to 2.302585092994046

location.href

location.href="https://www.google.com/"

log()

Math.log(2) //Equal to 0.6931471805599453

LOG2E

Math.LOG2E //Equal to 1.4426950408889634

LOG10E

Math.LOG10E //Equal to 0.4342944819032518

map

[1,2,3,4,5].map(x => x*2) //Equal to [2,4,6,8,10]

match()

"Str".match(/[a-z]/g) //Equal to ["t","r"]

max

Math.max(1,2,3,4,5) //Equal to 5

nextSibling

nextElementSibling

min

Math.min(1,2,3,4,5) //Equal to 1

mousedown

mouseenter

mouseleave

mousemove

mouseover

mouseout

mouseup

moveTo(x,y)

name

var a = btn.atrributes.item(0).name

NaN

nodeName

Number()

Number("12345") //Equal to 12345

Object.values()

const a = { a: 'somestring', b: 42, c: false };

Object.values(a)

//Equal to ['somestring', 42, false]

onblur()

onclick()

onerror()

onkeyup()

onkeydown()

onkeypress()

onfocus()

onload()

onmouseover()

onmouseup()

onmousedown()

onunload

onpaste

open()

window.open("https://www.google.com")

onsubmit()

outerHeight

window.outerHeight //Equal to window.innerHeight + bar

outerWidth

window.outerWidth //Equal to window.innerHeight + scroll

padStart

last4Digits.padStart(card.length,"*")

parseInt()

parseInt("2.456") //Equal to 2

parseFloat()

parseFloat("2.456") //Equal to 2.46

pixelDepth

screen.pixelDepth

PI

Math.PI //Equal to 3.14159256

platform

navigator.platform //Equal to System name

pop()

[1,2,3,4,5].pop() //Equal to 5

pow(x,y)

Math.pow(2,3) //Equal to 8

previousSibling

previousElementSibling

print()

window.print()

product

navigator.product

prompt()

prompt("happy new year")

push()

[1,2,3,4,5].push("6") //Equal to [1,2,3,4,5,6]

querySelector()

querySelectorAll()

reduce()

[1,2,3,4,5].reduce((a,b)=>a*b) //Equal to 120

reduceRight()

[1,2,3,4,5].reduce((a,b)=>a-b) //Equal to -5

random()

Math.random() //Equal to range [0-1]

remove()

removeChild

removeEventListener()

removeNamedItem()

btn.attributes.removeNamedItem("value")

repeat(num)

"12".repeat(2) //Equal to "1212"

replace

var a = "Hi World"

a.replace("Hi","No") //Equal to "No World"

replaceChild

reverse()

[1,2,3,4,5].reverse() //Equal to [5,4,3,2,1]

round()

Math.round(3.25) //Equal to 3

Set()

var arr = New Set()

setInterval()

setInterval(alert("Hi"),3000) //Equal to alert("Hi") each 3s

setNamedItem()

setTimeout()

setTimeout(alert("Hi"),3000) //Equal to alert("Hi")

shift()

[1,2,3,4,5].shift() //Equal to 1

sin()

Math.sin(30) //Equal to -0.9880316240928618

sinh()

Math.sinh(30) //Equal to 5343237290762.231

slice()

[1,2,3,4,5].slice(1,2) //Equal to [2]

some()

[1,2,3,4,5].some(x => x<2) //Equal to true

sort()

[1,3,2,5,4].sort() //Equal to [1,2,3,4,5]

specified

var btn = document.getElementsByTagName("BUTTON")[0]; var x = btn.getAttributeNode("onclick").specified;

splice()

[1,2,3,4,5].splice(2,1) //Equal to [3]

split()

"1234".split("") //Equal to ["1","2","3","4"]

sqrt()

Math.sqrt(4) // Equal to 2

SQRT2

Math.SQRT2 //Equal to 1.4142135623730951

SQRT1_2

Math.SQRT1_2 //Equal to 0.7071067811865476

startsWith

"12345".startsWith("1") //Equal to true

String()

String(12345) //Equal to "12345"

switch

switch(x){

case 0 :

return "happy";

break;

}

style.property

tan()

Math.tan(45) //Equal to 1.6197751905438615

tanh()

Math.tanh(-45) //Equal to -1

toFixed()

1.23456.toFixed(3) //Equal to 1.235

toLowerCase()

"Happy".toUpperCase() //Equal to "happy"

toString()

[1,2,3,4,5].toString() //Equal to "1,2,3,4,5"

toString(2)

var a = 2;

a.toString(2) //Equal to "10"

toString(8)

var a = 16;

a.toString(8) //Equal to "20"

toString(16)

var a = 15;

a.toString(16) //Equal to "f"

toUpperCase()

"happy".toUpperCase() //Equal to "HAPPY"

typeof n

typeof includes "number","string","boolean", etc

undefined

var a !== undefined //Equal to false

unshift()

[1,2,3,4,5].unshift(6) //Equal to [6,1,2,3,4,5]

userAgent

navigator.userAgent

value

var a = btn.atrributes.item(0).value

var

var a = "apple" //global

wheel

while

width

screen.width //Equal to screen width

window

window.innerWidth //Equal to browser width

write()

document.write("happy new year")

writeIn()

document.writeIn("happy new year")

+

1+2 //Equal to 3

-

1-2 //Equal to -1

*

1*2 //Equal to 2

/

1/2 //Equal to 0.5

**

2**2 //Equal to 4

%

2%1 //Equal to 0

++

2++ OR ++2

--

2-- OR --2

>=

x>=4

~

~5

^

>

x>4

<

x<4

<=

x<=4

<<

>>

>>>

&

&&

true && true //Equal to true

|

||

true || false //Equal to true

!=

true != false //Equal to true

!==

true !== false //Equal to ture

==

4=="4" //Equal to true

===

4==="4" //Equal to false