JS 鍵值對

function Map() {
 this.keys = new Array();
 this.data = new Array();
 //添加鍵值對
this.set = function (key, value) {
 if (this.data[key] == null) {//如鍵不存在則身【鍵】數組添加鍵名
this.keys.push(value);
 }
 this.data[key] = value;//給鍵賦值
};
 //獲取鍵對應的值
this.get = function (key) {
 return this.data[key];
 };
 //去除鍵值，(去除鍵數據中的鍵名及對應的值)
this.remove = function (key) {
 this.keys.remove(key);
 this.data[key] = null;
 };
 //判斷鍵值元素是否爲空
this.isEmpty = function () {
 return this.keys.length == 0;
 };
 //獲取鍵值元素大小
this.size = function () {
 return this.keys.length;
 };
 }