(function($){
 $.extend({
  jGFeed : function(url, fnk, num, key){
   // Make sure url to get is defined
   if(url == null) return false;
   // Build Google Feed API URL
   var gurl = "http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&callback=?&q="+url;
   if(num != null) gurl += "&num="+num;
   if(key != null) gurl += "&key="+key;
   // AJAX request the API
   $.getJSON(gurl, function(data){
    if(typeof fnk == 'function')
      fnk.call(this, data.responseData.feed);
    else
     return false;
   });
  }
 });
})(jQuery);

jQuery.jGFeed('XML或者RSS路径', function (feeds) {
 console.log(feeds);
})

var YqlUrl='http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20xml%20where%20url%3D"'+XML或者RSS路径+'"&format=json&diagnostics=true&callback=?'
$.getJSON(YqlUrl,function(data){
 console.log(data)
})