var c = 0;
function count(){
c++;
}
count();// 1
count();// 2

function count(){
 var c = 0;
 function add(){
  c++;
 }
 add();
}
count();// c = 1
count();// c = 1

function count(){
  var c = 0;
  function add(){
   c++;
  }
  return add;
}
var ct = count();
ct(); // c = 1
ct(); // c = 2

var person = (function(){
  var _name = "编程的人";
  var age = 20;
  return {
   add:function(){
     age++;
   },
   jian:function(){
     age--;
   },
   getAge:function() {
     return age;
   },
   getName:function(){
     return _name;
   },
   setName: function (name) {
     _name = name;        
   }
  }
})();
person.add();
var age = person.getAge();
console.log(age)
person.setName("编程的人公众号:bianchengderen")
console.log(person.getName())