检查窗口弹出窗口是否关闭

Question

我正在使用javascript在弹出窗口上打开YouTube视频。我使用以下代码

  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。

我尝试了什么

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

获取错误

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");
}
});

这也能够让窗户靠近。