Why is the return false stopping the alert?

Why does the return false stop the alert() from working and how do I get around this? If I remove it, the alert will show up, and then it will load the page that the <a> tag pointed to.

<script type="text/javascript">
    $("docume开发者_如何学Pythonnt").ready(function(){
        $("a").click(function(){
            if(!$(this).is('static')){
                var href = $(this).attr('href');
                $.getJSON(href, function(data) {
                    alert('hi');
                });
            }
            return false;
        });
    });
</script>

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My guess is that badly formed JSON is being sent to the client, which will prevent the callback from firing. The manual says:

If there is a syntax error in the JSON file, the request will usually fail silently. Avoid frequent hand-editing of JSON data for this reason.

Can you show us a snapshot of the JSON that the server is generating?

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Answer Update!

I have tested this thoroughly using the $.ajax functions, which is what actually gets called by $.getJSON.

$("document").ready(function(){
    $("a").click(function(event){
        if(!$(this).is('static')){
            var href = $(this).attr('href');
            $.ajax({
              url: href,
              dataType: 'text',
              success: function(data) {
                  alert("hi");
              }
            });

        }
        return false;
    });
});

With a correctly formatted JSON object, this works as expected. Here is the contents of my json.html test file:

{ "firstName" : "John",
                "lastName"  : "Doe",
                "age"       : 23 }

However, if the file contains HTML, or a badly formatted JSON object, the alert never gets called - in fact, by adding an error handler to the above example, you'll spot that it errors:

$("document").ready(function(){
    $("a").click(function(event){
        if(!$(this).is('static')){
            var href = $(this).attr('href');
            $.ajax({
              url: href,
              dataType: 'text',
              success: function(data) {
                  alert("hi");
              },
              error: function() {
                alert("NO!!!!");
              }
            });

        }
        return false;
    });
});

As you are replacing hyperlinks in your code with this request, I'm guessing that you maybe want to use a $.get, rather than a $.getJSON. So to return to your original example:

<script type="text/javascript">
    $("document").ready(function(){
        $("a").click(function(){
            if(!$(this).is('static')){
                var href = $(this).attr('href');
                $.get(href, function(data) {
                    alert('hi');
                });
            }
            return false;
        });
    });
</script>

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This seems to work in Firefox 3 and in Chrome, with both get and getJSON.

IE8 is another story (I presume the same goes for IE7). There, only get works; getJSON fails. Is the JSON being returned by the server not IE-friendly?