1. <SCRIPT type="text/javascript">  
    2. function Map() {  
    3.     this.elements = new Array();  
    4.     //获取MAP元素个数  
    5.     this.size = function() {  
    6.         return this.elements.length;  
    7.     };  
    8.     //判断MAP是否为空  
    9.     this.isEmpty = function() {  
    10.         return (this.elements.length < 1);  
    11.     };  
    12.     //删除MAP所有元素  
    13.     this.clear = function() {  
    14.         this.elements = new Array();  
    15.     };  
    16.     //向MAP中增加元素（key, value)   
    17.     this.put = function(_key, _value) {  
    18.         this.elements.push( {  
    19.             key : _key,  
    20.             value : _value  
    21.         });  
    22.     };  
    23.     //删除指定KEY的元素，成功返回True，失败返回False  
    24.     this.remove = function(_key) {  
    25.         var bln = false;  
    26.         try {  
    27.             for (i = 0; i < this.elements.length; i++) {  
    28.                 if (this.elements[i].key == _key) {  
    29.                     this.elements.splice(i, 1);  
    30.                     return true;  
    31.                 }  
    32.             }  
    33.         } catch (e) {  
    34.             bln = false;  
    35.         }  
    36.         return bln;  
    37.     };  
    38.     //获取指定KEY的元素值VALUE，失败返回NULL  
    39.     this.get = function(_key) {  
    40.         try {  
    41.             for (i = 0; i < this.elements.length; i++) {  
    42.                 if (this.elements[i].key == _key) {  
    43.                     return this.elements[i].value;  
    44.                 }  
    45.             }  
    46.         } catch (e) {  
    47.             return null;  
    48.         }  
    49.     };  
    50.     //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  
    51.     this.element = function(_index) {  
    52.         if (_index < 0 || _index >= this.elements.length) {  
    53.             return null;  
    54.         }  
    55.         return this.elements[_index];  
    56.     };  
    57.     //判断MAP中是否含有指定KEY的元素  
    58.     this.containsKey = function(_key) {  
    59.         var bln = false;  
    60.         try {  
    61.             for (i = 0; i < this.elements.length; i++) {  
    62.                 if (this.elements[i].key == _key) {  
    63.                     bln = true;  
    64.                 }  
    65.             }  
    66.         } catch (e) {  
    67.             bln = false;  
    68.         }  
    69.         return bln;  
    70.     };  
    71.     //判断MAP中是否含有指定VALUE的元素  
    72.     this.containsValue = function(_value) {  
    73.         var bln = false;  
    74.         try {  
    75.             for (i = 0; i < this.elements.length; i++) {  
    76.                 if (this.elements[i].value == _value) {  
    77.                     bln = true;  
    78.                 }  
    79.             }  
    80.         } catch (e) {  
    81.             bln = false;  
    82.         }  
    83.         return bln;  
    84.     };  
    85.     //获取MAP中所有VALUE的数组（ARRAY）  
    86.     this.values = function() {  
    87.         var arr = new Array();  
    88.         for (i = 0; i < this.elements.length; i++) {  
    89.             arr.push(this.elements[i].value);  
    90.         }  
    91.         return arr;  
    92.     };  
    93.     //获取MAP中所有KEY的数组（ARRAY）  
    94.     this.keys = function() {  
    95.         var arr = new Array();  
    96.         for (i = 0; i < this.elements.length; i++) {  
    97.             arr.push(this.elements[i].key);  
    98.         }  
    99.         return arr;  
    100.     };  
    101. }  
    103. $(function(){  
    104.     var map = new Map();  
    105.     map.put("key", "value");  
    106.     map.put("key1", "value1");  
    107.     map.put("key2", "value2");  
    108.     map.put("key3", "value3");  
    109.     var val = map.get("key2")  
    110.     alert(val);  
    111. });  
    112. </SCRIPT>