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This article mainly introduces what the JavaScript warning box refers to, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The JavaScript warning box can be implemented through the alert () method, which uses the syntax "alert (" text content you want to prompt ")"; the purpose of the warning box is to ensure that the user can get some information.

This article operating environment: windows7 system, javascript1.8.5 version, Dell G3 computer.

What is the JavaScript warning box?

Warning boxes are often used to ensure that users can get some information.

When the warning box appears, the user needs to click the OK button to proceed.

Alert ()

The alert () method displays a warning box with a pop-up prompt and a confirmation button.

It is important to note that alert () is a blocking function, and if we do not click the confirm button, the following content will not be loaded.

Mode of use:

Alert ("text content you want to prompt")

Sample code:

Alert ("this is pop-up prompt text")

Alert is a blocking function

This sentence will be displayed only after confirming the prompt text of the pop-up box.

Screenshot of the effect:

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