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Under what circumstances does $ (document) .ready start when the back button is clicked?

I am working with some code that uses jQuery $ (document) .ready to set up a jqGrid instance. It seems that the code runs even when you return to the page with a back-click.

On the test page with truncation, a similar cooking function is not called when it can be obtained by pressing the "Back" button:

<html>
<head>
    <script type="text/javascript" src="/JQuery/jquery-1.4.2.min.js"></script>

    <script type="text/javascript">

    $(document).ready(function(){
        alert('ready');
    })

    </script>
</head>
<body>
    <p>Index View</p>

    <a href="detail.html">Detail</a>
</body>
</html>

Can you give me some tips on where to look for what causes this difference in behavior?

I found some related information in the answer to this question , but there is no event handler registered for unloading on the page with the overactive ready event.

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