//封装http请求键值对的函数

 function Map() {

     this.keys = new Array();

     this.data = {};

     //添加键值对

     this.put = function(key, value) {

         if (this.data[key] == null) { //如键不存在则给键域数组添加键名

             this.keys.push(key);

         }

         this.data[key] = value; //给键索引对应的值域赋值

     };

     //获取键对应的值

     this.get = function(key) {

         return this.data[key];

     };

     //去除键值，(去除键数据中的键名及对应的值)

     this.remove = function(key) {

         this.keys.remove(key);

         this.data[key] = null;

     };

     //判断键值元素是否为空

     this.isEmpty = function() {

         return this.keys.length == 0;

     };

     //获取键值元素大小

     this.size = function() {

         return this.keys.length;

     };

 }