function _keys(obj)   
     {  
        if (!isObject(obj)) return [];  
        if (Object.keys) return Object.keys(obj);  
        var keys = [];  
        for (var key in obj) if (_.has(obj, key)) keys.push(key);  
        return keys;  
      }  
    function isObject(obj)   
    {  
        var type = typeof obj;  
        return type === 'function' || type === 'object' && !!obj;  
      }  
    console.log(_keys({red: "#FF0000", green: "#00FF00", white: "#FFFFFF"}));