jQuery插件简单实现方法

(function($){ 
 $.fn.extend({ 
  myFunk: function() { 
   // 此处必须返回jQuery对象
   return $(); 
  }, 
  myPunk: function() { 
   return this.addClass('punked') 
      .bind('click', function(){ 
    alert('You were punked!'); 
   }); 
  } 
 }); 
})(jQuery);

$('.select').myFunk(); 
$('.select').myPunk();