JavaScript弹出网址

Question

How can i get url of a popup opened by JS. Here is my code:

var _url = 'someurlhere';
    var popupwindow = window.open(_url, "Popup", 'width=800, height=600');
    var _this = this;

    var pollTimer   =   window.setInterval(function() {
        try {
            console.log(popupwindow.document.URL);
        } catch(e) {
            console.log(e.message);
        }
    }, 500);

but I'm getting a Cannot read property 'URL' of undefined error on line with console.log(e.message). Why ?

Answer 1

It won't work because you are using a url that is a different domain than the page you are running the script on. This is a violation of the " same origin policy ". IOW it is XSS, not allowed.

Answer 2

使用popupwindow.location.href而不是popupwindow.document.URL