JS实现Dictionary

首先说明一下，在IE浏览器中，有一个Dictionary对象，调用方法如下：

1 var dic = new ActiveXObject("Scripting.Dictionary");

但是这个对象有局限性，只能在IE浏览器中调用，由于平时开发出来的程序要适应多浏览器，所以写了如下一个Dictionary对象：

  1 /**
  2  * Created by Leo on 2015/4/26.
  3  */
  4 var Dictionary=function() {
  5     this.elements = new Array();
  6     //Length of Dictionary
  7     this.length = function () {
  8         return this.elements.length;
  9     };
 10     //Check whether the Dictionary is empty
 11     this.isEmpty = function () {
 12         return (this.length() < 1);
 13     };
 14     //remove all elements from the Dictionary
 15     this.removeAll = function () {
 16         this.elements = new Array();
 17     };
 18     //get specify element of the dictionary
 19     this.element = function (index) {
 20         var rlt = null;
 21         if (index >= 0 && index < this.elements.length) {
 22             rlt = this.elements[index];
 23         }
 24         return rlt;
 25     }
 26     //check whether the Dictionary contains this key
 27     this.Exists = function (key) {
 28         var rlt = false;
 29         try {
 30             for (var i = 0, iLen = this.length(); i < iLen; i++) {
 31                 if (this.elements[i].key == key) {
 32                     rlt = true;
 33                     break;
 34                 }
 35             }
 36         }
 37         catch (ex) {
 38         }
 39         return rlt;
 40     };
 41     //check whether the Dictionary contains this value
 42     this.containsValue = function (value) {
 43         var rlt = false;
 44         try {
 45             for (var i = 0, iLen = this.length(); i < iLen; i++) {
 46                 if (this.elements[i].value == value) {
 47                     rlt = true;
 48                     break;
 49                 }
 50             }
 51         }
 52         catch (ex) {
 53         }
 54         return rlt;
 55     };
 56     //remove this key from the Dictionary
 57     this.remove = function (key) {
 58         var rlt = false;
 59         try {
 60             for (var i = 0, iLen = this.length(); i < iLen; i++) {
 61                 if (this.elements[i].key == key) {
 62                     this.elements.splice(i, 1);
 63                     rlt = true;
 64                     break;
 65                 }
 66             }
 67         }
 68         catch (ex) {
 69         }
 70         return rlt;
 71     };
 72     //add this key/value to the Dictionary,if key is exists,replace the value
 73     this.add = function (key, value) {
 74         this.remove(key);
 75         this.elements.push({
 76             key: key,
 77             value: value
 78         });
 79     };
 80     //add this key/value to the Dictionary,if key is exists,append value
 81     this.set = function (key, value) {
 82         var arr = this.getItem(key);
 83         if (arr != null) {
 84             if (typeof(arr) == "object") {
 85                 arr.unshift.apply(arr, value);
 86                 value = arr;
 87             }
 88             else {
 89                 var array = [];
 90                 array.push(arr);
 91                 array.unshift.apply(array, value);
 92                 value = array;
 93             }
 94             this.remove(key);
 95         }
 96         this.elements.push({
 97             key: key,
 98             value: value
 99         });
100     }
101     //get value of the key
102     this.getItem = function (key) {
103         var rlt = null;
104         try {
105             for (var i = 0, iLen = this.length(); i < iLen; i++) {
106                 if (this.elements[i].key == key) {
107                     rlt = this.elements[i].value;
108                     break;
109                 }
110             }
111         }
112         catch (ex) {
113         }
114         return rlt;
115     };
116     //get all keys of the dictionary
117     this.keys = function () {
118         var arr = [];
119         for (var i = 0, iLen = this.length(); i < iLen; i++) {
120             arr.push(this.elements[i].key);
121         }
122         return arr;
123     }
124     //get all values of the dictionary
125     this.values = function () {
126         var arr = [];
127         for (var i = 0, iLen = this.length(); i < iLen; i++) {
128             arr.push(this.elements[i].value);
129         }
130         return arr;
131     }
132 }
Dictionary.js

 

posted @ 2015-05-08 22:14  Statmoon  阅读(5196)  评论(0)  编辑  收藏  举报