javascript中Map的应用
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();
this.elements.length = 0;
};
//向MAP中增加元素（key, value)
this.put = function(_key, _value) {
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;
};
}
/*****************************测试页面 index.jsp*******************************/
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="js/map.js"></script>
<title>map js Test</title>
</head>
<body>
</body>
<script type="text/javascript">
var map = new Map();
map.put("key0","value0");
map.put("key1","value1");
map.put("key2","value2");
map.put("key3","value3");
map.put("key4","value4");
map.put("key5","value5");
function Test(){
if(map.size() > 0){
var keys = map.keys();
for(var i=0;i<keys.length;i++){
alert("key:" + keys[i] + "value:" + map.get(keys[i]));
}
}
}
function TestRemove(){
if(map.size() > 0){
var keys = map.keys();
for(var i=0;i<keys.length;i++){
alert("动态移除key:" + keys[i]);
map.remove(keys[i]);
}
}
}
function TestClear(){
if(map.size() > 0){
var keys = map.keys();
alert("清空所用的keys:" + keys[i]);
map.clear();
}
}
function getValues(){
if(map.size() > 0){
var values = map.values();
for(var i=0;i<values.length;i++){
alert("value:" + values[i]);
}
}
}
</script>
</html>