JavaScript 实现类似Java Map对象

!(function (window) { /** * Map对象构造函数 * @class * @constructor */ var Map = function () { /** * 存档所有Key值的数组对象 * @type {any[]|Array} */ this.keys = new Array(); /** * 存放数据对象 * @type {Object} */ this.values = new Object; } /** * 扩充Map对象方法 * @type {{}} */ Map.prototype = { /** * 存放键值对 * @function * @param key * @param value */ put: function (key, value) { if (!this.values[key]) this.keys.push(key); this.values[key] = value; }, /** * 根据key值获取对象 * @param key * @returns {*} */ get: function (key) { return this.values[key]; }, /** * 根据key值删除对象 * @param key */ remove: function (key) { this.keys.remove(key); this.values[key] = null; }, /** * 循环遍历，执行回调函数 * @param fn 回调函数 */ each: function (fn) { if (typeof fn != 'function') { return; } for (var i = 0, var len = this.keys.length; i < len; i++ ) { var k = this.keys[i]; fn(k, this.values[k], i); } }, /** * 获取键值数组(类似Java的entrySet()) * @return 键值对象{key,value}的数组 */ entrys: function () { var len = this.keys.length; var entrys = new Array(len); for (var i = 0; i < len; i++) { entrys[i] = { key: this.keys[i], value: this.values[i] }; } return entrys; }, /** * 判断Map是否为空 */ isEmpty: function () { return this.keys.length == 0; }, /** * 获取键值对数量 */ size: function () { return this.keys.length; }, /** * 重写toString */ toString: function () { var s = "{"; for (var i = 0; i < this.keys.length; i++, s += ',') { var k = this.keys[i]; s += k + "=" + this.values[k]; } s += "}"; return s; } } window.Map = Map; })(window); //创建Map对象 var map = new Map(); map.put("obj", "String"); map.get("obj"); ...