The BS system is very annoying because it does not know when the user closes the browser and leaves the system. Here, we use the onbeforeunload parameter to monitor whether the user closes the browser.
<HTML>
<Head>
<Title> test </title>
</Head>
<Body onbeforeunload = "runonbeforeunload ()">
<Script language = "JavaScript">
Function runonbeforeunload (){
Window. event. returnvalue = 'close the browser and exit the system .';
}
</SCRIPT>
</Body>
</Html>
The effect is as follows:
When wondow. event. returnvalue is empty, this selection prompt box will not appear.
But the problem arises again: If I want users to save user data when they click "OK" to close the browser, what should I do?
It seems that only the onUnload parameter is used.
SetCodeModify as follows:
test
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