js 模拟实现类似c#下的hashtable的简单功能代码

// js哈希表
function HashTable() {
this.ObjArr = {};
this.Count = 0;
//添加
this.Add = function(key, value) {
if (this.ObjArr.hasOwnProperty(key)) {
return false; //如果键已经存在，不添加
}
else {
this.ObjArr[key] = value;
this.Count++;
return true;
}
}
//是否包含某项
this.Contains = function(key) {
return this.ObjArr.hasOwnProperty(key);
}
//取某一项 其实等价于this.ObjArr[key]
this.GetValue = function(key) {
if (this.Contains(key)) {
return this.ObjArr[key];
}
else {
throw Error("Hashtable not cotains the key: " + String(key)); //脚本错误
//return;
}
}
//移除
this.Remove = function(key) {
if (this.Contains(key)) {
delete this.ObjArr[key];
this.Count--;
}
}
//清空
this.Clear = function() {
this.ObjArr = {}; this.Count = 0;
}
}

//员工
function employee(id, userName) {
this.id = id;
this.userName = userName;
}
function test() {
var ht = new HashTable();
var tmpEmployee = null;
for (var i = 1; i < 6; i++) {
tmpEmployee = new employee(i, "Employee_" + i);
ht.Add(i, tmpEmployee);
}
for (var i = 1; i <= ht.Count; i++) {
alert(ht.GetValue(i).userName); //其实等价于ht.ObjArr[i].userName
//alert(ht.ObjArr[i].userName);
}
ht.Remove(1);
alert(ht.Contains(1)); //false
alert(ht.Contains(2)); //true
//alert(ht.GetValue(1)); //异常
var result = ht.GetValue(2);
if (result != null) {
alert("Employee Id:" + result.id + ";UserName:" + result.userName);
}
ht.Add(2, "这一个key已经存在!"); //Add无效
//ht.Clear(); //清空
alert(ht.Count);
}