（一）原生JS实现 - 基本类方法

类

 var Class = {
     create: function() {
         return function() {
             this.initialize.apply(this, arguments); }
     }
 };        

对象扩展

 var Extend = function(destination, source) {
     for (var property in source) {
         destination[property] = source[property];
     }
 };

获取DOM元素属性

 var Attr = function (element, key, value) {
     if(arguments.length == 2){
         if(element.getAttribute){
             return element.getAttribute(key) || element[key] || undefined;
         }
     }
     else if(arguments.length == 3){
         element.setAttribute(key,value);
     }
 };