alert
The alert function accepts a single argument. It displays the result on a modal dialog window.
The word "modal" means a user can't interact with the rest of the page.
The modal dialog window is a small box displayed on a web page.
Syntax:
alert(arg);
alert('Hello World!');
prompt
The prompt function accepts two arguments.
Syntax:
prompt(arg1[, arg2]);
- arg1 is required.
- arg2 is optional.
On Internet Explorer, arg2
is required.
// For other browsers
const birthYear = prompt("What year were you born?");
alert(birthYear);
// For Internet Explorer
const yourName = prompt("What is your name?", "Michelle");
alert(yourName);
confirm
The confirm function only accepts an argument.
Syntax:
confirm(arg);
If OK
is clicked, the result is true
and false
otherwise.
const isDoctor = confirm("Are you a Doctor?");
alert(isDoctor); // true if OK button is clicked
The above example is the same as below:
const isDoctor = prompt("Are you a Doctor?");
// const isDoctor = prompt("Are you a Doctor?", 'y/n'); IE
if (isDoctor === 'y') {
alert("true");
} else if (isDoctor === 'n') {
alert("false");
} else {
alert("enter either y/n")
}
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