jQuery Fast

gistfile1.js

//
// For simple selectors, these return a jQuery object
// faster via native element selection.
//
(function(window) {

  var
    doc = window.document,
    $   = window.jQuery;

  // Select element by id.
  // Usage:
  //  $.byId('txt_fname');
  $.byId = function( id ) {
    return new $.fn.init( doc.getElementById(id) );
  };

  // Select elements by tag name.
  // Usage:
  //  $.byClass('div');
  $.byTag = function( tagName ) {
    return new $.fn.init( doc.getElementsByTagName(tagName) );
  };

  // Select elements by class name.
  // Usage:
  //  $.byClass('links');
  $.byClass = function( className ) {
    return doc.getElementsByClassName
      ? new $.fn.init( doc.getElementsByClassName(className) )
      : $('.' + className);
  };

})(this);