var a = { what: "A regular JS object" },
                                    
                                  
                                  

                                    

                                          b = $('body');
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      if ( a.jquery ) { // falsy, since it's undefined
                                    
                                  
                                  

                                    

                                          alert(' a is a jQuery object! ');
                                    
                                  
                                  

                                    

                                      }
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      if ( b.jquery ) { // truthy, since it's a string
                                    
                                  
                                  

                                    

                                          alert(' b is a jQuery object! ');
                                    
                                  
                                  

                                    

                                      }
                                    
                                  
                                

                                  

                                    

                                      alert( 'You are running jQuery version: ' + $.fn.jquery );