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Try it JavaScript Display Possibilities  Writing into an HTML element, usinginnerHTML. document.getElementById("demo").innerHTML=5+6; Writing into the HTML output usingdocument.write(). document.write(5+6); Writing into an alert box, usingwindow.alert(). window.alert(5+6); Writing into the browser console, usingconsole.log(). console.log(5+6); Comments  Single Line // Change heading: Multiple line /* The code below will change the heading with id = "myH" and the paragraph with id = "myP" in my web page: */ Variables and Data Types  You declare a JavaScript variable with thevarkeyword: varcarName; Note: semicolons separate JavaScript statements. JavaScript variables can hold manydata types: numbers, strings, booleans, objects and more: varlength =16;// Number varlastName ="Johnson";// Stringvar varx =false; // Boolean If and Switch statement  if (condition) { block of code to be executed if the condition is true } else { block of code to be executed if the condition is false } switch(expression) { casen: code block break; casen: code block break; default: code block } For Loops for (statement 1;statement 2;statement 3) { code block to be executed } for(i =0; i < 10; i++) { text += cars[i] +"
"; } varperson = {fname:"John", lname:"Doe", age:25}; vartext =""; varx; for(xinperson) { text += person[x]; } While Loops  while (condition) { code block to be executed } while(i <10) { text +="The number is "+ i; i++; } Functions  varx = myFunction(4,3); var y = 10; functionmyFunction(a, b) { var x = 5; returna * b * x * y; } // returns 4 * 3 * 5 * 10 Anonymous Functions (Arrow Functions)  // Traditional Anonymous function function (a){ return a + 100; } // 1. Remove the word "function" and place arrow between the argument and opening body bracket (a) => { return a + 100; } // 2. Remove the body braces and word "return" -- the return is implied. (a) => a + 100; // 3. Remove the argument parentheses a => a + 100; HTML Events Here is a list of some common HTML events: EventDescriptiononchangeAn HTML element has been changedonclickThe user clicks an HTML elementonmouseoverThe user moves the mouse over an HTML elementonmouseoutThe user moves the mouse away from an HTML elementonkeydownThe user pushes a keyboard keyonloadThe browser has finished loading the page The time is? The time is? String Methods vartxt ="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; varsln = txt.length; varstr ="Please locate where 'locate' occurs!"; varpos = str.indexOf("locate"); varpos = str.lastIndexOf("locate"); varpos = str.search("locate"); varstr ="Apple, Banana, Kiwi"; varres = str.slice(7,13); varres = str.substring(7,13); str ="Please visit Microsoft!"; varn = str.replace("Microsoft","W3Schools"); varn = str.replace(/Microsoft/g,"W3Schools"); vartext2 = text1.toUpperCase(); vartext2 = text1.toLowerCase(); vartext ="Hello"+" "+"World!"; Date Methods newDate() newDate(milliseconds) newDate(dateString) newDate(year, month, day, hours, minutes, seconds, milliseconds) vard =newDate("October 13, 2014 11:13:00"); document.getElementById("demo").innerHTML= d; document.getElementById("demo").innerHTML= d.toString(); document.getElementById("demo").innerHTML= d.toUTCString(); document.getElementById("demo").innerHTML= d.toDateString(); document.getElementById("demo").innerHTML= d.getDate(); document.getElementById("demo").innerHTML= d.getDay(); document.getElementById("demo").innerHTML= d.getHours(); document.getElementById("demo").innerHTML= d.getMinutes(); document.getElementById("demo").innerHTML= d.getSeconds(); document.getElementById("demo").innerHTML= d.getMonth(); document.getElementById("demo").innerHTML= d.getFullYear(); Array Properties and Methods  varcars = ["Saab","Volvo","BMW"]; cars[0] ="Opel"; varname = cars[0]; varx = cars.length; varx = cars.sort(); var x = cars.reverse(); var x = cars.toString(); var x = cars.join(" * "); cars.pop(); cars.push("Audi"); cars[cars.length] ="Audi"; varmyGirls = ["Cecilie","Lone"]; varmyBoys = ["Emil","Tobias","Linus"]; varmyChildren = myGirls.concat(myBoys); Objects  varmyFather = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"}; with a prototype: functionPerson(first, last, age, eyecolor) { this.firstName= first; this.lastName= last; this.age= age; this.eyeColor= eyecolor; } varmyFather =newPerson("John","Doe",50,"blue"); varmyMother =newPerson("Sally","Rally",48,"green"); var myFatherFullName = myFather.firstName+" "+ myFather.lastName; var myFatherFullName = myFather["firstName"]+" "+ myFather["lastName"]; Object Methods  functionPerson(firstName, lastName, age, eyeColor) { this.firstName= firstName; this.lastName= lastName; this.age= age; this.eyeColor= eyeColor; this.changeName=function(newName) { this.lastName= newName; }; } var myMother = new Person("Sally","Rally",48,"green"); myMother.changeName("Doe"); Learn More ...  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