How to capture the window closing event with javascript: 1. Use javascript to redefine the [window.onbeforeunload()] event; 2. Add the onUnload event to the body tag.

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

Javascript method to capture window closing event:

1. Use javascript to redefine the window.onbeforeunload() event

Just define a function in javascript

function window.onbeforeunload() { alert("Close the window")}

alert() event will be executed before closing the window, you can also The user decides whether to close the window

function window.onbeforeunload() { 
if (event.clientX>document.body.clientWidth && event.clientY<0 ||event.altKey) 
window.event.returnValue="确定要退出本页吗？"; 
}

2. Use the onUnload method

Add the onUnload event to the body tag

body onUnload="myClose()"

Then define myClose( in javascript ) method

But the onUnload method is executed after closing the window, not before closing the window. If you want to make a judgment before closing the window, please use the first method

the above two For the method to be able to successfully close the window, the window must be an independent new window; if it is based on a parent window, it cannot be closed.

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