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In JavaScript, what is the purpose of onbeforeunload event?
Article Introduction：If you want to trigger an event before the document is loaded, use the onbeforeunload event. Example You can try running the following code to learn how to implement onbeforeunload event in JavaScript. <!DOCTYPEhtml><html> <bodyonbeforeunload="returnmyFunction()"> <ahref="https://www
2023-09-02
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1094
Detailed explanation of onbeforeunload event
Article Introduction：The onbeforeunload event is a commonly used event in JavaScript. It is usually used to prompt some information before the user leaves the page to ensure that the user does not leave the page unintentionally and lose important data. In this article, we will introduce the onbeforeunload event in detail, including its definition, usage and common problems.
2023-06-25
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3296
A brief discussion on onbeforeunload and onunload events in JavaScript_Basic knowledge
Article Introduction：The onbeforeunload and onunload events in JavaScript are functions of two functions before the page is loaded and when the page is closed. They can prevent prompts from being refreshed when the page is refreshed, or prompts from being refreshed when the page is closed. Let me introduce the usage of onbeforeunload and onunload events.
2016-05-16
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1204
