//javascript 没有map，但是有map功能-_-! 自己动手，丰衣足食
(function(){
try{
function Directory(){
this.key = new Array();
this.value = new Array();
}
//添加
Directory.prototype.add = function(key,value){
//key是否和已经存在的key重复
for(var i=0;i<this.key.length;i++){
if(this.key[i] == key){
throw new Error("重复key");
}
}
//没重复，add
this.key.push(key);
this.value.push(value);
}
//获取
Directory.prototype.get = function(key){
for(var i=0;i<this.key.length;i++){
if(this.key[i] == key)
return this.value[i];
}
throw new Error("没有你查什么 ReferenceError");
}
//删除
Directory.prototype.remove = function(key){
for(var i=0;i<this.key.length;i++){
if(this.key[i] == key){
//删除i位置的元素
this.key.splice(i,1);
this.value.splice(i,1);
return true;
}
}
throw new Error("没有你删毛线 ReferenceError");
}
var myarr = new Directory();
myarr.add("123",100);
myarr.add("wo","bysowhat");
alert(myarr.get("wo"));
alert(myarr.get("123"));
myarr.remove("123");
alert(myarr.get("123"));
}catch(e){
alert(e.message);
}
})();完整！
转载。。。。
/*
* MAP对象，实现MAP功能
*
* 接口：
* size() 获取MAP元素个数
* isEmpty() 判断MAP是否为空
* clear() 删除MAP所有元素
* put(key, value) 向MAP中增加元素（key, value)
* remove(key) 删除指定KEY的元素，成功返回True，失败返回False
* get(key) 获取指定KEY的元素值VALUE，失败返回NULL
* element(index) 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
* containsKey(key) 判断MAP中是否含有指定KEY的元素
* containsValue(value) 判断MAP中是否含有指定VALUE的元素
* values() 获取MAP中所有VALUE的数组（ARRAY）
* keys() 获取MAP中所有KEY的数组（ARRAY）
*
* 例子：
* var map = new Map();
*
* map.put("key", "value");
* var val = map.get("key")
* ……
*
*/
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.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;
}
}Creating a new Error object:
Internet Explorer supports the following form:
var errorObj = new Error([number[, description]]);
number
Optional. Integer that specifies the error code. Default is 0. Sets the error property of the Error object.
message
Optional. String that specifies the message of the error. Default is an empty string. Sets the description and messageproperties of the Errorobject.
Firefox supports the following form:
var errorObj = new Error([message[, fileName[, lineNumber]]]);
message
Optional. String that specifies the message of the error. Default is an empty string. Sets the description and messageproperties of the Errorobject.
fileName
Optional. String that specifies the name of the file where the error occurs. Default is the file where the Error object is created. Sets the fileNameproperty of the Error object.
lineNumber
Optional. Integer that specifies the line number where the error occurs. Default is the line number, where the Errorobject is created. Sets thelineNumber property of the Error object.
Opera, Google Chrome and Safari support the following form:
var errorObj = new Error([message]);
message
Optional. String that specifies the message of the error. Default is an empty string. Sets the description and messageproperties of the Error object.
原文地址：http://bysowhat.blog.51cto.com/4478944/1575897
