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; 
} 

} 

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