JavaScript Form validation   registration.html <! DOCTYPE html > < html lang = "en" > < head >     < meta charset = "UTF-8" >     < meta name = "viewport" content = "width=device-width, initial-scale=1.0" >     < title > Registration </ title >     < link rel = "stylesheet" href = "style.css" > </ head > < body >     < div class = "title" > REGISTRATION FORM </ div >     < div class = "form" name = "formdiv" >         < form name = "myform" method = "post" action = "https://www.nsec.ac.in/" onsubmit = " return validateform ()" >             < div class = "element" name = "inputdiv" > Name: < input type = "text" name = "name" ></ div >             < div class = "element" > Address: ...

  JAVASCRIPT ARRAY <! DOCTYPE html > < html lang = "en" > < head >     < meta charset = "UTF-8" >     < meta name = "viewport" content = "width=device-width, initial-scale=1.0" >     < title > Document </ title >     < script > ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////         const staffdetail = [             { name : "Gourab Das" , age : 20 , salary : 80000 , currency : "INR" },             { name : "Abhisek ck" , age : 20 , salary : 60000 , currency : "INR" },             { name : "Rahul k" , age : 20 , salary : 90000 , currency : "INR" },             { name : "Jahir" , age : 20 , salary : 100000 , currency : "INR" },         ...