js创建javaMap

(function(){
    var _common = {
        Map :function () {
            Array.prototype.remove = function(val) {
                var index = this.indexOf(val);
                if (index > -1) {
                    this.splice(index, 1);
                }
            };
            this.keys = new Array(); /** 存放键的数组(遍历用到) */
            this.data = new Object();/** 存放数据 */
            /**
             * 放入一个键值对
             * @param {String} key
             * @param {Object} value
             */
            this.put = function(key, value) {
                if(this.data[key] == null){
                    this.keys.push(key);
                }
                this.data[key] = value;
            };
            /**
             * 获取某键对应的值
             * @param {String} key
             * @return {Object} value
             */
            this.get = function(key) {
                return this.data[key];
            };
            /**
             * 删除一个键值对
             * @param {String} key
             */
            this.remove = function(k) {
                this.keys.remove(k);
                //delete this.keys[k];
                this.data[k] = null;
            };
            /**
             * 遍历Map,执行处理函数
             *
             * @param {Function} 回调函数 function(key,value,index){..}
             */
            this.each = function(fn){
                if(typeof fn != ‘function‘){
                    return;
                }
                var len = this.keys.length;
                for(var i=0;i<len;i++){
                    var k = this.keys[i];
                    fn(k,this.data[k],i);
                }
            };
            /**
             * 获取键值数组(类似Java的entrySet())
             * @return 键值对象{key,value}的数组
             */
            this.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.data[i]
                    };
                }
                return entrys;
            };
            /**
             * 判断Map是否为空
             */
            this.isEmpty = function() {
                return this.keys.length == 0;
            };
            /**
             * 获取键值对数量
             */
            this.size = function(){
                return this.keys.length;
            };
            /**
             * 重写toString
             */
            this.toString = function(){
                var s = "{";
                for(var i=0;i<this.keys.length;i++,s+=‘,‘){
                    var k = this.keys[i];
                    s += k+"="+this.data[k];
                }
                s+="}";
                return s;
            };
            /**
             * 重写toString
             */
            this.toMapString = function(){
                var s = "java.util.Map map = new java.util.HashMap();";
                for(var i=0;i<this.keys.length;i++){
                    var k = this.keys[i];
                    if(i != 0)    s +=";";

                    s += "map.put(\""+k+"\",\""+this.data[k]+"\")";
                }
                s+="; return map;";
                return s;
            };
        }

    };

    if(typeof JBPM == "undefined") window.JBPM={};
    JBPM.common = _common;
})();

/**
* Simple Map
* var m = new Map();
* m.put(‘key‘,‘value‘);
* ...
* var s = "";
* m.each(function(key,value,index){
* s += index+":"+ key+"="+value+"/n";
* });
* alert(s);
*/