Window alert() method

JavaScript Window Object

alert()The method displays a warning dialog containing warning information and a confirmation button.

In addition to message confirmations, warning dialogs are used for messages that do not require any response from the user.

Dialog is a modal window-Before the dialog is closed, they prevent users from accessing the rest of the program interface. Therefore, you should not overuse any functions that create dialogs.

Syntax:

window.alert(msg)

alert("Hello　world!");

Browser Compatibility

All browsers fully support the alert() method:

Parameter Value

Technical Details

More Examples

Alert Box Number:

alert(500);

Alert box with a string and a number:

alert("The number is: "　+　500);

Alert box with a newline character:

alert("Hello\nHow are you?");

Display the entire URL in the alert box:

alert(location.href);

This example demonstrates the different types of dialog boxes supported by JavaScript:

Related References

Window (Window) Reference:confirm() Method

Window (Window) Reference:hint() Method

JavaScript Window Object