how to get input from prompt in javascript code example

Example 1: how to ask input in javascript

let name=prompt("What is your name?");
console.log("Hi "+name)

Example 2: javascript prompt

var person = prompt("Please enter your name", "Harry Potter");

if (person != null) {
  document.getElementById("demo").innerHTML =
  "Hello " + person + "! How are you today?";
}