js实现类似list、map

/**  js实现list   */
function List() {
    this.value = [];
    /* 添加 */
    this.add = function(obj) {
        return this.value.push(obj);
    };
    /* 大小 */
    this.size = function() {
        return this.value.length;
    };
    /* 返回指定索引的值 */
    this.get = function(index) {
        return this.value[index];
    };
    /* 删除指定索引的值 */
    this.remove = function(index) {
        this.value.splice(index, 1);
        return this.value;
    };
    /* 删除全部值 */
    this.removeAll = function() {
        return this.value = [];
    };
    /* 是否包含某个对象 */
    this.constains = function(obj) {
        for (var i in this.value) {
            if (obj == this.value[i]) {
                return true;
            } else {
                continue;
            }
        }
        return false;
    };

    /* 获取所有对象 */
    this.getAll = function() {
        var allInfos = '';
        for (var i in this.value) {
            if (i != (value.length - 1)) {
                allInfos += this.value[i] + ",";
            } else {
                allInfos += this.value[i];
            }
        }
        alert(allInfos);
        return allInfos;
    };
}

/**  js实现Map   
例子：  
 * var map = new Map();  
 *  
 * map.put("key", "value");  
 * var val = map.get("key") 
*/
function Map() {
    this.elements = new Array();

    //获取MAP元素个数  
    this.size = function() {
        return this.elements.length;
    };

    //判断MAP是否为空  
    this.isEmpty = function() {
        return (this.elements.length < 1);
    };

    //删除MAP所有元素  
    this.clear = function() {
        this.elements = new Array();
    };

    //向MAP中增加元素（key, value)   
    this.put = function(_key, _value) {
        this.elements.push({
            key: _key,
            value: _value
        });
    };

    //删除指定KEY的元素，成功返回True，失败返回False  
    this.remove = function(_key) {
        var bln = false;
        try {
            for (i = 0; i < this.elements.length; i++) {
                if (this.elements[i].key == _key) {
                    this.elements.splice(i, 1);
                    return true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    };

    //获取指定KEY的元素值VALUE，失败返回NULL  
    this.get = function(_key) {
        try {
            for (i = 0; i < this.elements.length; i++) {
                if (this.elements[i].key == _key) {
                    return this.elements[i].value;
                }
            }
        } catch (e) {
            return null;
        }
    };

    //获取指定索引的元素（使用element.key，element.value获取KEY和VALUE），失败返回NULL  
    this.element = function(_index) {
        if (_index < 0 || _index >= this.elements.length) {
            return null;
        }
        return this.elements[_index];
    };

    //判断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.elements.length; i++) {
                if (this.elements[i].key == _key) {
                    bln = true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    };

    //判断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.elements.length; i++) {
                if (this.elements[i].value == _value) {
                    bln = true;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    };

    //获取MAP中所有VALUE的数组（ARRAY）  
    this.values = function() {
        var arr = new Array();
        for (i = 0; i < this.elements.length; i++) {
            arr.push(this.elements[i].value);
        }
        return arr;
    };

    //获取MAP中所有KEY的数组（ARRAY）  
    this.keys = function() {
        var arr = new Array();
        for (i = 0; i < this.elements.length; i++) {
            arr.push(this.elements[i].key);
        }
        return arr;
    };
}