JavaScript method to detect if a pop up window has closed

This article demonstrates an example of how JavaScript detects if a pop-up window has closed. Share with you for your reference. The specific implementation method is as follows:

var win = window.open('foo.html','windowName',"width=200,height=200,scrollbars=no");

var timer = setInterval(function() {   

    if(win.closed) {  

        clearInterval(timer);  

        alert('closed');  

    }  

}, 1000);

I hope this article has been helpful to your javascript programming.