how to ask for user input in html code example

Example 1: javascript prompt

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

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

Example 2: how to get a user input in js

Copyvar name = window.prompt("Enter your name: ");
alert("Your name is " + name);