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In JavaScript, what is the purpose of onbeforeunload event?

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Release： 2023-09-02 18:33:02
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In JavaScript, what is the purpose of onbeforeunload event?

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 the onbeforeunload event in JavaScript. 

<!DOCTYPE html>
<html>
   <body onbeforeunload="return myFunction()">

      <a href="https://www.qries.com">Click to open Qries</a>
      <script>
         function myFunction() {
            return "Working with onbeforeunload event";
         }
      </script>
   </body>
</html>
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