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map object in javascript
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/* | |
* MAP对象,实现MAP功能 | |
* | |
* 接口: | |
* size() 获取MAP元素个数 | |
* isEmpty() 判断MAP是否为空 | |
* clear() 删除MAP所有元素 | |
* put(key, value) 向MAP中增加元素(key, value) | |
* remove(key) 删除指定KEY的元素,成功返回True,失败返回False | |
* get(key) 获取指定KEY的元素值VALUE,失败返回NULL | |
* element(index) 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 | |
* containsKey(key) 判断MAP中是否含有指定KEY的元素 | |
* containsValue(value) 判断MAP中是否含有指定VALUE的元素 | |
* values() 获取MAP中所有VALUE的数组(ARRAY) | |
* keys() 获取MAP中所有KEY的数组(ARRAY) | |
* | |
* 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) { | |
if(this.containsKey(_key)){ | |
this.remove(_key); | |
} | |
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; | |
} | |
} |
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