getItem<T> method
获取数据
Implementation
T? getItem<T>(String key, {ElSerialize? serialize}) {
if (isExpire(key)) {
removeItem(key);
return null;
} else {
var result = data[key];
if (result == null) return null;
if (isExpireData(result)) result = result[expireDataKey];
return serialize == null ? result : serialize.deserialize(result);
}
}