[SyncVar] 是一个属性，可以添加到 NetworkBehaviour 类的成员变量上。这些变量的值将从服务器同步到游戏中处于就绪状态的客户端。
设置 [SyncVar] 的值会将其标记为“脏”，这样一来，该值将在当前帧结束时发送给客户端。只有简单值可以标记为 [SyncVars]。SyncVar 变量的类型不能来自外部 DLL 或程序集。
using UnityEngine; using UnityEngine.Networking;
public class Ship : NetworkBehaviour { [SyncVar] public int health = 100;
[SyncVar] public float energy = 100; }
允许的 SyncVar 类型为：
• 基本类型（byte、int、float、string、UInt64 等）\
• 内置 Unity 数学类型（Vector3、Quaternion 等）\
• 包含允许类型的结构。\
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