一个JS Class的“增删改查”

function AA (){
 var r={};
 this.get = function(key){
  return r[key];
 }

 this.put = function(key,x){
  r[key] = x;
 }

 this.each = function (Func) {
  for (var v in r) {
   Func(v, r[v]);
  }
 }
 this.remove = function (key) {
  delete r[key];
 }
}