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;
};
}