;(function($) {   // multiple plugins can go here   (function(pluginName) {     var defaults = {       color: 'black',       testFor: function(div) {         return true;       }     };     $.fn[pluginName] = function(options) {       options = $.extend(true, {}, defaults, options);                    return this.each(function() {         var elem = this,           $elem = $(elem);           // heres the guts of the plugin           if (options.testFor(elem)) {             $elem.css({               borderWidth: 1,               borderStyle: 'solid',               borderColor: options.color             });           }       });     };     $.fn[pluginName].defaults = defaults;    })('borderize'); })(jQuery);   //下面是用法 $('div').borderize(); $('div').borderize({color: 'red'});

$('.borderize').borderize({     testFor: function(elem) {         var $elem = $(elem);         if (elem.is('.inactive')) {             return false;         } else {             // calling "parent" function             return $.fn.borderize.defaults.testFor.apply(this, arguments);         }     } }); We can even do this with regular properties like this   var someVarThatMayBeSet = false; /* code ... */   $('.borderize').borderize({     color: someVarThatMayBeSet ? 'red' : $.fn.borderize.defaults.color });