function Dictionary(){var items = {};//驗證一個key是否是items對象的一個屬性this.has = function(key){return key in items;};//給字典添加一個新的值，或者用來更新一個已有的值this.set = function(key,value){items[key] = value;};this.remove = function(key){if(this.has(key)){delete items[key];return true;}return false;};this.get = function(key){return this.has(key)?items[key]:undefined;};this.values = function(){var values = [];//遍歷items對象的所有屬性值for(var k in items){//用has函數來驗證key確實存在，然后將它的值加入values數組if(this.has(k)){values.push(items[k]);}}//返回所有找到的值return values;};//返回items變量的方法this.getItems = function(){return items;};this.clear = function(){items = {};};this.size = function(){return Object.keys(items).length;};this.keys = function(){return Object.keys(items);};}var dictionary = new Dictionary();dictionary.set('Gandalf','gandalf@email.com');dictionary.set('John', 'johnsnow@email.com');dictionary.set('Tyrion', 'tyrion@email.com');console.log(dictionary.has('Gandalf'));//返回trueconsole.log(dictionary.size()); //3console.log(dictionary.keys());//["Gandalf", "John", "Tyrion"]console.log(dictionary.values()); //["gandalf@email.com", "johnsnow@email.com", "tyrion@email.com"]console.log(dictionary.get('Tyrion')); //tyrion@email.comdictionary.remove('John');console.log(dictionary.keys()); //["Gandalf", "Tyrion"]console.log(dictionary.values()); // ["gandalf@email.com", "tyrion@email.com"]console.log(dictionary.getItems()); //{Gandalf: "gandalf@email.com", Tyrion: "tyrion@email.com"}

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