gistfile1.txt

self.JSONP = function (params)//(url, data, method, callback)
{
    self.Assert(params.url, 'Must supply a valid URL to fetch');
    self.Assert(params.cb, 'Must supply a valid callback');

    var url = params.url;
    var data = params.data;
    var cb = params.cb;

    if (data)
    {
        var queryString = '';
        var keys = Object.keys(data);

        for (var i = 0; i < keys.length; i++)
        {
            queryString += encodeURIComponent(keys[i]) + '=' + encodeURIComponent(data[keys[i]]);

            if (i !== keys.length - 1)
            {
                queryString += '&';
            }
        }

        url += '?' + queryString;
    }

    var timestamp = Date.now();
    var generatedFunction = 'jsonp' + Math.round(timestamp + Math.random() * 10001);

    window[generatedFunction] = function (json)
    {
        cb(json);

        delete window[generatedFunction];
    };

    if (url.indexOf('?') === -1) { url = url+'?'; }
    else { url = url+'&'; }

    var jsonpScript = document.createElement('script');
    jsonpScript.id = generatedFunction;
    jsonpScript.setAttribute('src', url + 'callback=' + generatedFunction);

    document.getElementsByTagName('head')[0].appendChild(jsonpScript);
};