Pagination script do not understand, need a detailed explanation on each line. Appreciated!

Pagination script do not understand, need a detailed explanation on each line. Appreciated!

Hello, everyone, I am struggling to understand what this piece of code mean, could any one help me explain its process in detail? I read through it and think its some type of data implimentation script.

Btw, its in the core script file for simplepagination jquery script.

Thank you all!
  2. $.fn.pagination = function(method) {

  4. // Method calling logic
  5. if (methods[method] && method.charAt(0) != '_') {
  6. return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
  7. } else if (typeof method === 'object' || !method) {
  8. return methods.init.apply(this, arguments);
  9. } else {
  10. $.error('Method ' +  method + ' does not exist on jQuery.pagination');
  11. }

  13. };