1 <html>
2 <head>
3 <title>Test Map</title>
4 <script type="text/javascript">
5 <!--
6
7 /**
8 * Simple Map
9 *
10 *
11 * var m = new Map();
12 * m.put(‘key‘,‘value‘);
13 * ...
14 * var s = "";
15 * m.each(function(key,value,index){
16 * s += index+":"+ key+"="+value+"/n";
17 * });
18 * alert(s);
19 *
20 */
21 function Map() {
22 /** 存放键的数组(遍历用到) */
23 this.keys = new Array();
24 /** 存放数据 */
25 this.data = new Object();
26
27 /**
28 * 放入一个键值对
29 * @param {String} key
30 * @param {Object} value
31 */
32 this.put = function(key, value) {
33 if(this.data[key] == null){
34 this.keys.push(key);
35 }
36 this.data[key] = value;
37 };
38
39 /**
40 * 获取某键对应的值
41 * @param {String} key
42 * @return {Object} value
43 */
44 this.get = function(key) {
45 return this.data[key];
46 };
47
48 /**
49 * 删除一个键值对
50 * @param {String} key
51 */
52 this.remove = function(key) {
53 this.keys.remove(key);
54 this.data[key] = null;
55 };
56
57 /**
58 * 遍历Map,执行处理函数
59 *
60 * @param {Function} 回调函数 function(key,value,index){..}
61 */
62 this.each = function(fn){
63 if(typeof fn != ‘function‘){
64 return;
65 }
66 var len = this.keys.length;
67 for(var i=0;i<len;i++){
68 var k = this.keys[i];
69 fn(k,this.data[k],i);
70 }
71 };
72
73 /**
74 * 获取键值数组(类似Java的entrySet())
75 * @return 键值对象{key,value}的数组
76 */
77 this.entrys = function() {
78 var len = this.keys.length;
79 var entrys = new Array(len);
80 for (var i = 0; i < len; i++) {
81 entrys[i] = {
82 key : this.keys[i],
83 value : this.data[i]
84 };
85 }
86 return entrys;
87 };
88
89 /**
90 * 判断Map是否为空
91 */
92 this.isEmpty = function() {
93 return this.keys.length == 0;
94 };
95
96 /**
97 * 获取键值对数量
98 */
99 this.size = function(){
100 return this.keys.length;
101 };
102
103 /**
104 * 重写toString
105 */
106 this.toString = function(){
107 var s = "{";
108 for(var i=0;i<this.keys.length;i++,s+=‘,‘){
109 var k = this.keys[i];
110 s += k+"="+this.data[k];
111 }
112 s+="}";
113 return s;
114 };
115 }
116
117
118 function testMap(){
119 var m = new Map();
120 m.put(‘key1‘,‘aaa‘);
121 m.put(‘key2‘,‘bbb‘);
122 m.put(‘key3‘,‘ccc‘);
123 alert("init:"+m);
124
125 m.put(‘key1‘,‘aaaxg‘);
126 alert("set key1:"+m);
127
128 m.remove("key2");
129 alert("remove key2: "+m);
130
131 var s ="";
132 m.each(function(key,value,index){
133 s += index+":"+ key+"="+value+"\n";
134 });
135 alert(s);
136 }
137 //-->
138 </script>
139 </head>
140 <body>
141 <input type="button" value="test" onclick="testMap()">
142 </body>
143 </html>
时间： 2024-10-09 02:00:50