js中map的⼏种实现⽅式简单使⽤
  1，通过对象⽅式：
var myHash = {};
myHash["deviceID"] = "HY_000001";
myHash["cameraID"] = "SX_000001";
for(key in myHash){
document.write( "key = " + key + "; value = " + myHash[key] + "<br />");
}
  2，通过数组⽅式：
var myHash = [];
myHash.push("deviceID");
myHash["deviceID"] = "HY_000001";
myHash.push("cameraID");
myHash["cameraID"] = "SX_000001";
for(key in myHash){
document.write( "key = " + key + "; value = " + myHash[key] + "<br />");
}
通过对象⽅式定义map
function getMap()
{
//初始化map_，给map_对象增加⽅法，使map_像Map
var map_ = new Object();
map_.put = function(key, value) {
map_[key+'_'] = value;
};
map_.get = function(key) {
return map_[key+'_'];
};
map_.remove = function(key) {
delete map_[key+'_'];
};
jsarray删除元素map_.keyset = function() {
var ret = "";
for(var p in map_) {
if(typeof p == 'string' && p.substring(p.length-1) == "_") {
ret += ",";
ret += p.substring(0,p.length-1);
}
}
if(ret == "") {
return ret.split(",");
} else {
return ret.substring(1).split(",");
}
};
return map_;
}
var map = getMap();
map.put("395","12,21,52,89,35");
map.put("396","121111,2222221,5333332,8444449,3555555");
("395"));//输出：12,21,52,89,35
alert(map.keyset()); //输出：395,396
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function HashMap(){
this.map = {};
}
HashMap.prototype = {
put : function(key , value){
this.map[key] = value;
},
get : function(key){
if(this.map.hasOwnProperty(key)){
return this.map[key];
}
return null;
},
remove : function(key){
if(this.map.hasOwnProperty(key)){
return delete this.map[key];
}
return false;
},
removeAll : function(){
this.map = {};
},
keySet : function(){
var _keys = [];
for(var i in this.map){
_keys.push(i);
}
return _keys;
}
};
structor = HashMap;
var hashMap = new HashMap();
hashMap.put('key' ,'value');
hashMap.put('key1' ,'value');
console.('key'));
console.log(hashMap.keySet());
console.ve('key'));
console.log(hashMap.keySet());
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通过数组⽅式定义map
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veByKey = 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);
/
/删除指定VALUE的元素，成功返回True，失败返回False
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value) {
this.elements.splice(i, 1);
return true;
}
}
} catch (e) {
bln = false;
}
return bln;
};
//删除指定VALUE的元素，成功返回True，失败返回False
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value && 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
< = 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 false;
}
return false;
};
//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
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
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value) {
//判断MAP中是否含有指定VALUE的元素
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value && this.elements[i].key == _key) {                    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VALUE的数组（ARRAY）
this.valuesByKey = function(_key) {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
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;
};
//获取key通过value
this.keysByValue = function(_value) {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
if(_value == this.elements[i].value){
arr.push(this.elements[i].key);
}
}
return arr;
};
//获取MAP中所有KEY的数组（ARRAY）
this.keysRemoveDuplicate = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
var flag = true;
for(var j=0;j if(arr[j] == this.elements[i].key){
flag = false;
break;
}
}
if(flag){
arr.push(this.elements[i].key);
}
}
return arr;
};
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