[問題] 如何在popstate事件中取得「上一頁」的URL?

[freebug (Freebug)]

Here's a simple example of pushState and popstate event:



    <button id="example_btn">Click me</button>

    <script>
    $("#example_btn").click(function(){
                history.pushState(
                    {
                        'url' : "example.htm"
                    }, null, "example.htm");
    });
    $(window).bind('popstate', function (event) {
        if (event.originalEvent.state) {
            console.log(event.originalEvent.state.url);
        }
    });
    </script>




When triggering the popstate event, it shows the url of the current page.

My question is:

How can I get the url of the previous page when triggering the popstate event
in this case?


P.S. I have tried document.referrer but it didn't show anything.


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