JavaScript系列：模块化与链式编程

 1 var man=function(){
 2             var age=12;
 3             return {
 4                 getYear:function(){
 5                     return age;
 6                 },
 7                 setYear:function(n){
 8                     age=n;
 9                 }
10             }
11         }
12 
13         var peter=man();
14         document.write(peter.getYear()); //12
15         peter.setYear(20);
16         document.write(peter.getYear());//20
17         document.write(peter.age); //undefined 属性私有只能通过接口访问

 1 var man=function(){
 2             var age=12;
 3             return {
 4                 getYear:function(){
 5                    alert(age);
 6                     return this;
 7                 },
 8                 setYear:function(n){
 9                     age=n;
10                     return this;
11                 }
12             }
13         }
14 
15         var peter=man();
16         peter.getYear().setYear(20).getYear();  //级联