# Dictionary | ***Name*** | ***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="" | | 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("") | | 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 |