Message Boxes
There are three message boxes: alert, confirm, and prompt.
Alert
Let’s look at the first one:
You can put whatever you want inside the quotation marks.
Confirm
An example for confirm box:
window.confirm("Are you sure you want to quit?")
Prompt
Prompt box is used to allow a user to enter something according the promotion:
window.prompt("please enter user name")
In all our examples above, we wrote the box methods as window.alert(). Actually, we could simply write the following instead as:
alert()
confirm()
prompt()
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