---
title: "Update 和 FixedUpdate"
content_type: tutorial
url: "https://learn.unity.com/tutorial/update-he-fixedupdate?language=zh-cn"
language: zh-cn
difficulty: beginner
duration_minutes: 5
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last_updated: "2026-08-04T14:24:49.000Z"
---

# Update 和 FixedUpdate

了解 Update 和 FixedUpdate 每帧的执行方式，从而在脚本中正确实现基于时间的变化。

如何使用 Update 和 FixedUpdate 函数实现每帧的更改，以及它们之间的区别。

本教程包含在“[初级编程](https://learn.unity.com/project/chu-ji-bian-cheng?language=zh)”项目中。

上一教程：[Awake 和 Start](https://learn.unity.com/tutorial/awake-he-start?language=zh&projectId=5e3afd88edbc2a2998252c77)

下一教程：[矢量数学](https://learn.unity.com/tutorial/shi-liang-shu-xue?language=zh&projectId=5e3afd88edbc2a2998252c77)

## 1. Update 和 FixedUpdate

[Video](https://connect-mediagw.unity.com/h1/20200206/videos/eb1318ba-f49c-40e9-9371-96fc3a1de213_08_C__Update_And_Fixed_Update_in_Unity!___Beginner_Scripting_Tutorial.mp4) ([Transcript (zh_cn)](https://connect-mediagw.unity.com/h1/20200206/e8e599a5-43fc-441a-8cfe-e340b34459e3_08_C__Update_And_Fixed_Update_in_Unity____Beginner_Scripting_Tutorial___Chinese.vtt))

```csharp
using UnityEngine;
using System.Collections;

public class UpdateAndFixedUpdate : MonoBehaviour
{
    void FixedUpdate ()
    {
        Debug.Log("FixedUpdate time :" + Time.deltaTime);
    }
    
    
    void Update ()
    {
        Debug.Log("Update time :" + Time.deltaTime);
    }
}
```