JavaScript 字典类 偏执的太偏执、 2022-06-02 01:27 162阅读 0赞 function Dictionary(){ var items = {}; //验证一个key是否是items对象的一个属性 this.has = function(key){ return key in items; }; //给字典添加一个新的值,或者用来更新一个已有的值 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 = []; //遍历items对象的所有属性值 for(var k in items){ //用has函数来验证key确实存在,然后将它的值加入values数组 if(this.has(k)){ values.push(items[k]); } } //返回所有找到的值 return values; }; //返回items变量的方法 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true console.log(dictionary.size()); //3 console.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.com dictionary.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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