自己寫的一個javascript map類

眾所周之，js是沒有Map類的，要想用還得自己封裝一個。

代碼如下

複製代碼

(function(win) {     var Map = function() {         this.count = 0;         this.entrySet = {};     };     var proto = Map.prototype;     proto.size = function() {         return this.count;     };     proto.isEmpty = function() {         return this.count === 0;     };     proto.containsKey = function(key) {         if (this.isEmpty()) {             return false;         }         for ( var prop in this.entrySet) {             if (prop === key) {                 return true;             }         }         return false;     };     proto.containsValue = function(value) {         if (this.isEmpty()) {             return false;         }         for ( var key in this.entrySet) {             if (this.entrySet[key] === value) {                 return true;             }         }         return false;     };     proto.get = function(key) {         if (this.isEmpty()) {             return null;         }         if (this.containsKey(key)) {             return this.entrySet[key];         }         return null;     };     proto.put = function(key, value) {         this.entrySet[key] = value;         this.count++;     };     proto.remove = function(key) {         if (this.containsKey(key)) {             delete this.entrySet[key];             this.count--;         }     };     proto.putAll = function(map) {         for ( var key in map.entrySet) {             this.put(key, map.entrySet[key]);         }     };     proto.clear = function() {         for ( var key in this.entrySet) {             this.remove(key);         }     };     proto.values = function() {         var result = [];         for ( var key in this.entrySet) {             result.push(this.entrySet[key]);         }         return result;     };     proto.keySet = function() {         var result = [];         for ( var key in this.entrySet) {             result.push(key);         }         return result;     };     proto.toString = function() {         var result = [];         for ( var key in this.entrySet) {             result.push(key + ":" + this.entrySet[key]);         }         return "{" + result.join() + "}";     };     proto.valueOf = function() {         return this.toString();     };     win.Map = Map; })(window);