1.upto 10 do |i|
    puts i if i==3..i==5
end

--方法1 慢。。。。。
select postby,(select count(*) from articles where status=1 and postby=ar.postby) as art_num,(select count(*) from articles where status=1 and isgood=1 and postby=ar.postby) as goodart_num,title from articles as ar group by postby order by goodart_num desc,art_num desc limit 10

--方法2 快。。。。。
select postby,sum(case when status=1 then 1 else 0 end) as art_num,sum(case when status=1 and isgood=1 then 1 else 0 end) as goodart_num,title from articles group by postby order by goodart_num desc,art_num desc limit 10;

//You need an anonymous function to wrap around your function to avoid conflict
(function($){

    //Attach this new method to jQuery
    $.fn.extend({

        //This is where you write your plugin's name
        pluginname: function() {

            //options
            var defaults = {
                option1: "default_value"
            }

            var options = $.extend(defaults, options);

            //a public method
            this.methodName: function () {
                //call this method via $.pluginname().methodName();
            }

            //Iterate over the current set of matched elements
            return this.each(function() {

                var o = options;

                //code to be inserted here

            });
        }
    });

//pass jQuery to the function,
//So that we will able to use any valid Javascript variable name
//to replace "$" SIGN. But, we'll stick to $ (I like dollar sign: ) )      
})(jQuery);

$(function(){
  // define the application
  var Notekeeper = {};
  (function(app){
    // variable definitions go here
    app.init = function(){
    // stuff in here runs first
    }
   app.init();
  })(Notekeeper);
});