jQuery and CouchDBX - _all_docs - HTTP 200 but no data is returned to success function

I can't access my CouchDB server (CouchDBX) using a jQuery AJAX call.

I am able to access my demo database at localhost:5984/helloworld/_all_docs through browsers (tested with FireFox, Chrome and Safari). But when I do a simple AJAX call using jQuery I get no data returned.

The requests completes with code 200.

Here's what my AJAX call looks like:

$(function ()
{
    $.ajax(
    {
        cache: false,
        dataType: "json",
        error: function (xmlHttpRequest, textStatus, errorThrown)
        {
            cons开发者_如何学Goole.log("error", xmlHttpRequest, textStatus, errorThrown);
        },
        global: false,
        success: function (data, textStatus, xmlHttpRequest)
        {
            console.log("success", data, textStatus, xmlHttpRequest);
        },
        timeout: 3000,
        url: "http://localhost:5984/helloworld/_all_docs"
    });
});

What am I doing wrong?

Update

Screenshots of FireBug console:

http://grab.by/6fkS

http://grab.by/6fkX

http://grab.by/6fkY

I think your browser is blocking the data.

XmlHttpRequest error: Origin null is not allowed by Access-Control-Allow-Origin

http://www.w3.org/TR/cors/