jquery - difference between $.functionName and $.fn.FunctionName

Question

In jQuery, I have seen both the following ways of defining a jQuery function:

$.fn.CustomAlert = function() {
  alert(\'boo!\');
};

$.CustomAlert = function         


        

Answer 1

A

$.a = function() {
  return "hello world";
};

alert($.a());

B

$.fn.b = function() {
  return "hello " + $(this).length + " elements";
}

alert($("p").b());