(self, value=None, cache=True,timeout=CACHE_TIMEOUT)
@param name: str　字段的名称
        @param cache: bool 是否本地缓存获取到的值
def __init__(self, value=None, cache=True,timeout=CACHE_TIMEOUT):
        """
        @param name: str　字段的名称
        @param cache: bool 是否本地缓存获取到的值
        """
        self.name = ""
        self.value = value
        self.cache = cache
        self.timeout = timeout
def __init__ ( self , value = None , cache = True , timeout = CACHE_TIMEOUT ) : self . name = "" self . value = value self . cache = cache self . timeout = timeout