Javascript下实现MAP
Java中大家会经常用到MAP，但是在Javascript中要如何实现呢，下面给大家贴段从网上搜集过来的代码，写得还是不错的。
/**
* Make a map like java.
* You can use this map like this :
* var myMap = new Map();
* myMap.put("key","value");
* var key = myMap.get("key");
*/
function Map() {
this.elements = new Array();
this.size = function() {
return this.elements.length;
}
this.isEmpty = function() {
return (this.elements.length < 1);
}
this.clear = function() {
this.elements = new Array();
}
this.put = function(_key, _value) {
this.elements.push({key:_key, value:_value});
}
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;
}
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;
}
}
this.element = function(_index) {
if (_index < 0 || _index >= this.elements.length) {
return null;
}
return this.elements[_index];
}
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;
}
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;
}
this.values = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
arr.push(this.elements[i].value);
}
return arr;
}
this.keys = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
arr.push(this.elements[i].key);
}
return arr;
}
}
