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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <title> New Document </title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <script type="text/javascript">
function Map(linkItems) {  
this.current = undefined;  
this._size = 0;  
if(linkItems === false){ 
this.disableLinking();  
}  

/**
* 获取当前map
* @return 当前对象
*/ 
Map.noop = function() {  
return this;  
};  
/**
* 非法操作
* @return
*/ 
Map.illegal = function() {  
throw new Error("非法操作,Map已经被禁用");  
};  
/**

* @param obj
* @param foreignKeys
* @return
*/ 
Map.from = function(obj, foreignKeys) {  
var map = new Map;  
for(var prop in obj) {  
if(foreignKeys || obj.hasOwnProperty(prop)){ 
map.put(prop, obj[prop]);  
}  
}  
return map;  
};  
/**
* 禁用map
* @return
*/ 
Map.prototype.disableLinking = function() {  
this.link = Map.noop;  
this.unlink = Map.noop;  
this.disableLinking = Map.noop;  
this.next = Map.illegal;  
this.key = Map.illegal;  
this.value = Map.illegal;  
this.clear = Map.illegal;  
return this;  
};  
/**
* 返回hash值 例如:number 123
* @param value key/value
* @return
*/ 
Map.prototype.hash = function(value) {  
return (typeof value) + ' ' + (value instanceof Object ? (value.__hash || (value.__hash = ++arguments.callee.current)) : value.toString());  
};  
/**
* 返回map的长度
* @return
*/ 
Map.prototype.size = function() {  
return this._size; 
};  
 
Map.prototype.hash.current = 0;  
/**
* 通过key获取value
* @param key
* @return
*/ 
Map.prototype.get = function(key) {  
var item = this[this.hash(key)];  
return item === undefined ? undefined : item.value;  
};  
/**
* 向map中添加数据
* @param key 键
* @param value 值
* @return
*/ 
Map.prototype.put = function(key, value) {  
var hash = this.hash(key);  
if(this[hash] === undefined) {  
var item = { key : key, value : value };  
this[hash] = item;  
this.link(item);  
++this._size;  
}else{ 
this[hash].value = value; 
}  
return this;  
};  
/**
* 通过key删除数据
* @param key
* @return
*/ 
Map.prototype.remove = function(key) {  
var hash = this.hash(key);  
var item = this[hash];  
if(item !== undefined) {  
--this._size;  
this.unlink(item);  
delete this[hash];  
}  
return this;  
};  
/**
* 清除map
* @return
*/ 
Map.prototype.clear = function() {  
while(this._size){ 
this.remove(this.key());  
}  
return this;  
};  
/**
* 处理队列
* @param item
* @return
*/ 
Map.prototype.link = function(item) {  
if(this._size == 0) {  
item.prev = item;  
item.next = item;  
this.current = item;  
}else {  
item.prev = this.current.prev;  
item.prev.next = item;  
item.next = this.current;  
this.current.prev = item; 
}  
};  
Map.prototype.unlink = function(item) {  
if(this._size == 0){  
this.current = undefined; 
}else {  
item.prev.next = item.next;  
item.next.prev = item.prev;  
if(item === this.current){ 
this.current = item.next;  
}  
}  
};  
/**
* 获取下一个
* @return
*/ 
Map.prototype.next = function() {  
this.current = this.current.next;  
return this; 
};  
/**
* 获取key
* @return
*/ 
Map.prototype.key = function() {  
return this.current.key;  
};  
/**
* 获取value
* @return
*/ 
Map.prototype.value = function() {  
return this.current.value;  
};    
function a()
{
var map=new Map();
map.put('5',5);
map.put('1',1);



var ops = document.getElementById("sel").options;
for(i=0;i<ops.length;i++)
{
if(map.get(ops.options[i].value) != undefined)
{
//alert(map.get(ops.options[i].value));
ops.options.remove(i);
}
}

}

  </script>
</head>

<body>




<select id="sel" style="width:200px">
<option value=1  alt="abc"> 1 </option>
<option value=2> 2 </option>
<option value=3> 3 </option>
<option value=4> 4 </option>
<option value=5> 5 </option>
<option value=6> 6 </option>
<option value=7> 7 </option>
<option value=8> 8 </option>
<option value=9> 9 </option>

</select>


<input type="button" value="aaaaaa" onclick="a()">
</body>
</html>
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