两种写法对比：

第一种：

;(function($){
      $.fn.myplugin = function(op,params){
         if (typeof op == ‘string‘){
             return $.fn.myplugin.methods[op](this,params);
         }
         //默认参数
         var settings = {
             "text" : "hehe",
             "color" : "red" 
        }
         settings = $.extend(settings,op);//参数合并
         return this.each(function(){
             $(this).text(settings.text).css("color",settings.color);
         });
     };
     //暴露的API
     $.fn.myplugin.methods = { 
        show : function(selector,params){
             showText();
         },
         getValue : function(selector,params){
             console.log("value is"+ params);
         }
     };
     //静态方法 
    function showText(param){
         alert(param);
     }
 })(jQuery);
控件调用：

var m = $(".b").myplugin({
     "text" : "haha",
     "color" : "yellow"
 });
 m.myplugin("show","zhangsan");
 m.myplugin("getValue","zhangsan");

第二种：

;(function($){
     var $target;
     var settings = null;
     $.fn.myPlugin = function(options){
         $target = $(this);
         if($.fn.myPlugin.methods[options]){
             return $.fn.myPlugin.methods[options].apply(this,Array.prototype.slice.call(arguments,1));
         }else if(typeof options == "object"||!options){
             return $.fn.myPlugin.methods.init.apply(this,arguments);
         }else{
             $.error("Methods"+options+"does not exist on jQuery.myPlugin");
         }
     };
     $.fn.myPlugin.methods = {
         init : function(op){
             var defualt = {
                 width : 100,
                 heght : 50
             };
             settings = $.extend(defualt,op);
             myPluginInit(settings,$target);
             bindEvents();
             return $target;
         },
         getValue : function(){
             return "000";
         }
     };
     function myPluginInit(settings,$target){
         $target.width(settings.width);
         $target.height(settings.height);
     }
     function bindEvents(){
         $(this).click(function(){
             alert("click");
         });
     }
 })(jQuery);

jQuery控件有所感悟