JS封裝類似JAVA中的MAP

function JS_OBJECT_MAP(){
	this.js_object_map = new Array();
	// 獲取MAP元素大小
	this.size = function(){
		return this.js_object_map.length;
	}
	// 判斷MAP是不是空，返回true：空/false：不空
	this.isEmpty = function(){
        return (this.js_object_map.length < 1);
    }
    // 清空MAP
    this.clear = function(){
    	this.js_object_map = new Array();
    }
    // 給MAP中放值(key,value)
    this.put = function(_key,_value){
    	this.js_object_map.push({
    		key:_key,
    		value:_value
    	});
    }
    // 刪除指定KEY的元素，成功返回True，失敗返回False
    this.remove = function(_key){
		var bln = false;
        try {
            for (i = 0; i < this.js_object_map.length; i++) {
                if (this.js_object_map[i].key == _key) {
                    this.js_object_map.splice(i, 1);
                    return true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    }
    // 獲取指定KEY的元素值VALUE，失敗返回NULL
    this.get = function(_key){
    	try {
    		var result = null;
            for (i = 0; i < this.js_object_map.length; i++) {
                if (this.js_object_map[i].key == _key) {
                    result = this.js_object_map[i].value;
                }
            }
            return result;
    	} catch(e) {
    		return null;
    	}
    }
    // 設置MAP中指定KEY元素的值VALUE, 失敗返回NULL
    this.set = function(_key, _value){
    	try{
    		this.remove(_key);
    		this.put(_key,_value);
    	}catch(e){
    		return null;
    	}
    }
    // 獲取制定索引的元素
    this.getByIndex = function(_index){
    	if (_index < 0 || _index >= this.js_object_map.length) {
            return null;
        }
        return this.js_object_map[_index];
    }
    // 判斷MAP中是否含有指定KEY的元素
    this.containsKey = function(_key){
    	var bln = false;
        try {
            for (i = 0; i < this.js_object_map.length; i++) {
                if (this.js_object_map[i].key == _key) {
                    bln = true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    }
    // 判斷MAP中是否含有指定VALUE的元素
    this.containsValue = function(_value){
    	var bln = false;
        try {
            for (i = 0; i < this.js_object_map.length; i++) {
                if (this.js_object_map[i].value == _value) {
                    bln = true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    }
    // 獲取MAP中所有VALUE的數組
    this.values = function(){
    	var arr = new Array();
        for (i = 0; i < this.js_object_map.length; i++) {
            arr.push(this.js_object_map[i].value);
        }
        return arr;
    }
    // 獲取MAP中所有KEY的數組
    this.keys = function(){
    	var arr = new Array();
        for (i = 0; i < this.js_object_map.length; i++) {
            arr.push(this.js_object_map[i].key);
        }
        return arr;
    }
}