js Map封装

function Map(){
        this.elements = new Array();

        /**
         * 返回数组长度
         * @returns {Number}
         */
        this.size = function(){
            return this.elements.length;
        }

        /**
         * 清空数组
         */
        this.clear = function(){
            this.elements = new Array();
        }

        /**
         * 装入数据 {key:value}
         * @param key
         * @param value
         */
        this.put = function(key,value){
            if (key == null || key == undefined)return;
            if(this.containsKey(key)){
                this.update(key,value);
            }else{
                this.elements.push({
                    key : key,
                    value : value
                })
            }

        }

        /**
         * 根据key获取当前数组中所对应的值 / 找不到返回null
         * @param key
         * @returns {*}
         */
        this.get = function(key){
            try{
                for(var i=0; i<this.size(); i++){
                    if(this.elements[i].key == key){
                        return this.elements[i].value;
                    }
                }
            }catch(e){
                return null;
            }
            return null;
        }

        /**
         * 根据key删除数组数据
         * @param key
         * @returns {boolean}
         */
        this.remove = function(key){
            try {
                for (var i=0; i< this.size(); i++) {
                    if (this.elements[i].key == key){
                        this.elements.splice(i, 1);
                        return true;
                    }
                }
            }catch(e){
                return false;
            }
            return true;
        }

        /**
         * 更新数组value值
         * @param key
         * @param value
         * @returns {boolean}
         */
        this.update = function(key,value){
            for(var i=0;i<this.size();i++){
                if(this.elements[i].key == key){
                    this.elements[i].value = value;
                    return true;
                }
            }
            return false;
        }

        /**
         * 是否包含key值
         * @param key
         * @returns {boolean}
         */
        this.containsKey = function(key){
            try{
                for(var i=0;i<this.size();i++){
                    if(this.elements[i].key == key){
                        return true;
                    }
                }
            }catch(e){
                return false;
            }
            return false;
        }

        /**
         * 获取数组中所有数据
         * @returns {Array}
         */
        this.keys = function(){
            var array = new Array();
            for(var i=0;i<this.size();i++){
                array.push(this.elements[i].value);
            }
            return array;
        }

        /**
         * 通过数组下标获取data
         * @param number
         * @returns {*}
         */
        this.getIndex = function(number){
            if(number<0 || number>=this.size()){
                return null;
            }
            return this.elements[number];
        }




    }