JSPlus__AJAX

JSPlus.ajax = function(obj){
    var xhr = (function(){
        var xhr = false;
        if (window.XMLHttpRequest) { // Chrome, FF, Safari,...
            (xhr = new XMLHttpRequest()).overrideMimeType && xhr.overrideMimeType('text/xml');
        } else if (window.ActiveXObject) { // IE
            try {
                xhr = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    xhr = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {
                    console.log('Tu navegador es muy antiguo, no soporta AJAX');
                    throw e;
                }
            }
        }
        return xhr;
    })();

    JSPlus.calcar(obj, JSPlus.ajax.porDefecto);

    xhr.open(obj.metodo, obj.url, obj.async);
    for(var i in obj.headers){
        obj.headers.hasOwnProperty(i) && xhr.setRequestHeader(i, obj.headers[i]);
    }

    xhr.onreadystatechange = function(){
        console.log(obj);
        xhr.readyState == 4 && xhr.status == 200 && obj.ok(xhr.responseText);
    };

    xhr.send(obj.info);

};

JSPlus.ajax.porDefecto = {
    'url' : 'index.php',
    'metodo' : 'GET',
    'info' : '',
    'ok' : function(){},
    'async' : true,
    'headers' : {},
    'contexto' : null
}