how to get user input in javascript

1let name=prompt("What is your name?");
2console.log("Hi "+name)

1var name = prompt("Please enter your name", "Harry Potter");

1Copyvar name = window.prompt("Enter your name: ");
2alert("Your name is " + name);

1var answer = prompt('What is your name?','Joe Blogg');

1let r = readLine();
2const PI = Math.PI;
3
4// Print the area of the circle:
5console.log(PI*r*r);
6// Print the perimeter of the circle:
7console.log(PI*2*r);
8

1var name = window.prompt("What is your name");
2document.write("Hello " + name);