检查窗口是否弹出关闭

Question

我打开使用JavaScript弹出的YouTube视频。我正在使用以下代码

var myWindow; 
    $("#nextview").click(function() { 

    var vidurl = 'www.youtube.com'; 
    myWindow = window.open(vidurl, "popupWindow", "width=600, height=400, scrollbars=yes"); 
    //counter(myWindow,refreshIntervalId); 

}); 

现在我想在用户关闭此弹出窗口时显示消息。

我试过

myWindow.addEventListener("beforeunload", function(event) { 
    event.returnValue = "Write something clever here.."; 
}); 

得到错误

Uncaught TypeError: Cannot read property 'addEventListener' of undefined 

Answer 1

试试这个

var myWindow; 
    $("#nextview").click(function() { 

    var vidurl = 'www.youtube.com'; 
    myWindow = window.open(vidurl, "popupWindow", "width=600, height=400, scrollbars=yes"); 
    //counter(myWindow,refreshIntervalId); 
    myWindow.onbeforeunload = function(){ 
     //some code like 
     alert("closed"); 
} 
}); 

这也能够赶上窗口关闭。