javascript实现简单的Map示例介绍

复制代码 代码如下:

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False
this.removeByKey = 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;
};

//删除指定VALUE的元素，成功返回True，失败返回False
this.removeByValue = function(_value) {//removeByValueAndKey
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
this.removeByValueAndKey = function(_key,_value) {
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
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 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
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;
};

//判断MAP中是否含有指定VALUE的元素
this.containsObj = function(_key,_value) {
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;jif(arr[j] == this.elements[i].key){
flag = false;
break;
}
}
if(flag){
arr.push(this.elements[i].key);
}
}
return arr;
};
}