成员的完整列表，这些成员属于 com.netease.nimlib.sdk.msg.attachment.NotificationAttachment,包括所有继承而来的类成员

fromJson(String json)	com.netease.nimlib.sdk.msg.attachment.NotificationAttachment
getType()	com.netease.nimlib.sdk.msg.attachment.NotificationAttachment
parse(JSONObject json)	com.netease.nimlib.sdk.msg.attachment.NotificationAttachment
setType(NotificationType type)	com.netease.nimlib.sdk.msg.attachment.NotificationAttachment
toJson(boolean send)	com.netease.nimlib.sdk.msg.attachment.NotificationAttachment