js实现hashmap

js实现hashmap ，项目中遇到了要在js中使用java hashmap的功能，找到一个不错的JS实现，
感谢lujc：

/***
 * js 实现hashmap  功能  lujc
 * 常用功能实现
 * @return
 */
function HashMap(){
	this.length = 0;
	this.maxLength = Number.MAX_VALUE;
	this.container = {};
}
HashMap.prototype.put = function(objName,objValue){
	try{
		if(this.length >= this.maxLength)
			throw new Error("[Error HashMap] : Map Datas' count overflow !");
		if(objName != ""){
			for(var p in this.container){
				if(p == objName){
					this.container[objName] = objValue;
					return ;
				}
			}
			this.container[objName] = objValue;
			this.length ++ ;
		}
	}catch(e){
		return e;
	}
};
HashMap.prototype.get = function(objName){
	try{
		if(this.container[objName])
			return this.container[objName];
	}catch(e){
		return e;
	}
};
HashMap.prototype.contains = function(objValue){
	try{
		for(var p in this.container){
			if(this.container[p] === objValue)
				return true;
		}
		return false;
	}catch(e){
		return e;
	}
};
HashMap.prototype.remove = function(objName){
	try{
		if(this.container[objName]){
			delete this.container[objName];
			this.length -- ;
		}
	}catch(e){
		return e;
	}
};
HashMap.prototype.pop = function(objName){
	try{
		var ov = this.container[objName];
		if(ov){
			delete this.container[objName];
			this.length -- ;
			return ov;
		}
		return null;
	}catch(e){
		return e;
	}
};
HashMap.prototype.removeAll = function(){
	try{
		this.clear();
	}catch(e){
		return e;
	}
};
HashMap.prototype.clear = function(){
	try{
		delete this.container;
		this.container = {};
		this.length = 0;
	}catch(e){
		return e;
	}
};
HashMap.prototype.isEmpty = function(){
	if(this.length === 0)
		return true;
	else
		return false;
};
HashMap.prototype.runIn = function(fun){
	try{
		if(!fun)
			throw new Error("[Error HashMap] : The paramer is null !");
		for(var p in this.container){
			var ov = this.container[p];
			fun(ov);
		}
	}catch(e){
		return e;
	}
};