2017-04-25 23:14:34 +00:00
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<html>
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<body>
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<script type="text/javascript" charset="utf-8">
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2020-05-26 13:21:38 +00:00
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function installBeforeUnload(removeAfterNTimes) {
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let count = 0
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2020-04-16 22:22:39 +00:00
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window.addEventListener('beforeunload', function handler(e) {
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2020-05-26 13:21:38 +00:00
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setTimeout(() => console.log('beforeunload'))
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if (++count <= removeAfterNTimes) {
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e.preventDefault();
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e.returnValue = '';
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}
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2020-04-16 22:22:39 +00:00
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})
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2020-06-02 02:32:39 +00:00
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console.log('installed')
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2017-04-25 23:14:34 +00:00
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}
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</script>
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</body>
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</html>
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