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function User(properties)
{
    for(var i in properties){(function(which){
    var p=i;
    //´´½¨´ËÊôÐÔµÄÒ»¸öеĶÁÈ¡Æ÷(getter)
    which["get"+p] = function(){
    return properties[p];
    };
    //´´½¨´ËÊôÐÔµÄÒ»¸öеÄÉèÖÃÆ÷(setter)
    which["set"+p] = function(val){
    properties[p] = val;
    };
    })(this);   
    }
}
//´´½¨Ò»¸öеÄÓû§¶ÔÐÔʵÀý£¬²¢°Ñ¾ßÓÐÁ½¸öÊôÐÔµÄÒ»¸ö¶ÔÏó´«Èë×÷ΪÖÖ×Ó
var user = new User({
    name:"Bob";
    age:44;
));
//×¢ÒânameÊôÐÔ²¢²»´æÔÚ
//ÒòΪËüÊÇÊôÐÔ¶ÔÏó(properties object)µÄ˽ÓбäÁ¿
alert(user.name == null);
//²»¹ýÎÒÃÇ¿ÉÒÔʹÓÃеÄgetname()·½·¨À´»ñµÃÕâ¸öÖµ
//ÒòΪ´Ëº¯ÊýÊǶ¯Ì¬Éú³ÉµÄ
alert(user.getname() =="Bob");
//×îºó£¬ÎÒÃÇ¿´µ½Äܹ»Ê¹ÓÃÕâ¸öÐÄÉú³ÉµÄº¯ÊýÀ´ÉèÖûò»ñµÃÄêÁä
user.setage(22);
alert(user.getage()==22);


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