TypeError: $(...).unload is not a function - JQuery 3.1.0

Try to change like below, because you are using jquery-3

$(window).on("unload", function(e) {
    alert("call");
    console.log("this will be triggered");
});

The correct answer would be this:

$(window).on("beforeunload", function() { 
    // your codes
});

Unfortunately, as of Chrome on a PC in Apr 2020, this is not triggered

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