javascript file have error : prompt is not defined?

Question

I am newbie with javascript and I am writing a very simple javascript according to the textbook and here is the code

var location1 = 3;
var location2 = 4;
var location3 = 5;
var guess;
var hits = 0;
var guesses = 0;
var isSunk = false;

while (isSunk == false) {
  guess = prompt("Ready, aim, fire! (enter a number from 0-6):") // prompt instead of promt
  if (guess < 0 || guess > 6) {
    alert("Please enter a valid cell number!");
  } else {
    guesses = guesses + 1;
    if (guess == location1 || guess == location2 || guess == location3) {
      alert("HIT!");
      hits = hits + 1;
      if (hits == 3) {
        isSunk = true;
        alert("You sank my battleship!");
      }
    } else {
      alert("MISS");
    }
  }
}
var stats = "You took " + guesses + " guesses to sink the battleship, " +
  "which means your shooting accuracy was " + (3 / guesses);
alert(stats);

Then, I installed nodejs, and tried to run this file by many ways. but it said to me many error. The 1st error is, when I ran it directly

Object expected
800A138F
microsoft jscript runtime error

the second error is, when I ran it by the command node battleship.js, here is the error the error about the command "node battleship.js

As you can see in the picture, it said to me that promt is not defined. My problem is, I ran another code no problem. Which means nodejs no problem. And, I ran my code online no problem, which means my code no problem.

So, how can I fix this one ? Could you please help me with this ? Thank you very much for your time.

How can you use prompt on the server-side...Is this a part of API? If you looking for prompt that works exactly like in clien-size then It's not available on the server-side... — DecPK
– DecPK, Commented May 31, 2021 at 14:17
Does this answer your question? How does one use "prompt" and "alert" javascript commands in webstorm? — Sebastian Simon
– Sebastian Simon, Commented May 31, 2021 at 14:27
Copy and paste your code to the console chrome dev tool then hit enter. — hoangdv
– hoangdv, Commented May 31, 2021 at 14:28

Tony Zhang · Accepted Answer · 2021-05-31 14:30:03Z

1

Node.js isn't the same as running javascript in the browser, it doesn't have the window object, which has things like prompt() or alert(). in browsers, those show up as a pop-up.

Instead of alert(), you can probably just use console.log(), and for prompt(), you can look at this https://nodejs.dev/learn/accept-input-from-the-command-line-in-nodejs

const readline = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
})

readline.question(`What's your name?`, name => {
    console.log(`Hi ${name}!`)
    readline.close()
})

answered May 31, 2021 at 14:30

Tony Zhang

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