javascript - Any real difference between window.prompt and prompt? - Stack Overflow

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Just out of curiosity is there any difference between window.prompt and prompt in JavaScript.

For one of the answers to my exam questions the teacher uses

var yourName = window.prompt("Please enter your first name here\n");

and I used

var yourName = prompt("Please enter your first name here\n");

It is a written exam so i felt it wouldn't make much difference.

Just out of curiosity is there any difference between window.prompt and prompt in JavaScript.

For one of the answers to my exam questions the teacher uses

var yourName = window.prompt("Please enter your first name here\n");

and I used

var yourName = prompt("Please enter your first name here\n");

It is a written exam so i felt it wouldn't make much difference.

• javascript
• prompt

Share Improve this question Follow edited Apr 20, 2014 at 16:09 j08691 208k3232 gold badges269269 silver badges280280 bronze badges asked Apr 20, 2014 at 16:07 user3364498user3364498 48911 gold badge99 silver badges1414 bronze badges 2

• 2 Nope, they're the same. – j08691 Commented Apr 20, 2014 at 16:08
• 2 when you declare a variable that is in the root scope, you can find it inside window. as well. var test = 10; window.test will be 10. therefore they are exactly the same function (not a copy) – user652649 Commented Apr 20, 2014 at 16:09

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2 Answers 2

Sorted by: Reset to default 6

Usually yes, window.prompt === prompt. Yet it does depend on your scope, someone might have declared window or prompt variables with different values than those in the global scope.

For further details have a look at Is window really global in Javascript?. You (and your teacher) also might be interested in Why is it beneficial to rely on the scope chain alone and avoid explicitly referencing the head object in Javascript?.

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

if (person != null) {

document.getElementById("demo").innerHTML =

"Hello " + person + "! How are you today?"; }

usually window.prompt === prompt because,

A prompt dialog contains a single-line textbox, a Cancel button, and an OK button, and returns the (possibly empty) text the user entered into that textbox. ... alert Dialog boxes are modal windows; they prevent the user from accessing the rest of the program's interface until the dialog box is closed

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