js中的map

看到网上很多的js的map实现，也自己实现了一个

// map实现   
var map = new Object();   
map.put = function (key,value){   
    var s = "map." + key + ' = "' + value + '";';   
    eval(s);   
}   
map.get = function(key){   
    var v = eval("map." + key + ";");   
    return v;   
}   
  
map.keySet = function(){   
    var keySets = new Array();   
    for(key in map){   
        if(!(typeof(map[key])=="function")){   
            keySets.push(key);   
        }   
    }   
    return keySets;   
}   
  
/*  
 * use example  
 */  
 /*  
map.put("a","Tom");  
map.put("b","Nick");  
var keys = map.keySet();  
for(i in keys){  
    key = keys[i];  
    alert("key:" + key + "  value:" + map.get(key));  
}  
* /  
/*  
 * end example  
 */  

现在，看到了关联数组，可以这用才模拟map

var map = {};   
  
// put   
var key = "key1";   
var value = "value1";   
map[key] = value;   
  
// get   
alert(map[key]);   
  
if("key1" in map) { //判断是否存在   
  alert("OK");   
}   
  
// 删除   
delete map["key1"];    
  
// 遍历   
for(key in map){   
    alert(key + map[key]);   
}