javascript 实现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) {
if (this.containsKey(_key) == true) {
this.update(_key,_value);
} else {
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];
},
// 更新指定元素,失败返回null
this.update = function(_key,_value) {
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
this.elements[i].value = _value;
return true;
}
}
return false;
} catch (e) {
return false;
}
},
// 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;
};
}
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) == true) {
this.update(_key,_value);
} else {
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];
},
// 更新指定元素,失败返回null
this.update = function(_key,_value) {
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
this.elements[i].value = _value;
return true;
}
}
return false;
} catch (e) {
return false;
}
},
// 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;
};
}