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beforeunload-false-prevent3.html

beforeunload-false-prevent3.html 422 B
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  1. <html>
    2. 

  2. <body>
    3. 

  3. <script type="text/javascript" charset="utf-8">
    4. 

  4.   function installBeforeUnload(removeAfterNTimes) {
    5. 

  5.     let count = 0
    6. 

  6.     window.addEventListener('beforeunload', function handler(e) {
    7. 

  7.       setTimeout(() => console.log('beforeunload'))
    8. 

  8.       if (++count <= removeAfterNTimes) {
    9. 

  9.         e.preventDefault();
    10. 

  10.         e.returnValue = '';
    11. 

  11.       }
    12. 

  12.     })
    13. 

  13.     console.log('installed')
    14. 

  14.   }
    15. 

  15. </script>
    16. 

  16. </body>
    17. 

  17. </html>
    18.