...variable in javacript code example

Example 1: javascript variable

var user_name = prompt("Please enter your name:", "Type here");
alert("Hello " + user_name);

Example 2: variable in js

////We can define variables in 3 ways {var,let,const}/////// 
////syntax- var variable_name=value;
/////  let variable_name=value;
/////const variable_name=value;

var myfristvariable="neha jaiswal";
const mysecondvariable=80;
let mythirdvar=abc;