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This article mainly shows you "how to use window.alert () in JavaScript". The content is simple and clear. I hope it can help you solve your doubts. Let the editor lead you to study and learn this article "how to use window.alert () in JavaScript".

JavaScript display scheme

JavaScript can "display" data in different ways:

Use window.alert () to write a warning box

To access the HTML element, JavaScript can use the document.getElementById (id) method.

The id attribute defines the HTML element. The innerHTML attribute defines the HTML content:

Example

My first web page

My first paragraph

Document.getElementById ("demo"). InnerHTML = 5 + 6

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