---
title: "DeltaTime"
content_type: tutorial
url: "https://learn.unity.com/tutorial/deltatime?language=zh-cn"
language: zh-cn
difficulty: beginner
duration_minutes: 5
unity_version:
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    url: "https://learn.unity.com/tutorial/delta-time.md?language=en"
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    url: "https://learn.unity.com/tutorial/deltatime-guan-shu.md?language=ja"
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    url: "https://learn.unity.com/tutorial/deltatime.md?language=zh-cn"
last_updated: "2026-08-04T14:21:20.000Z"
---

# DeltaTime

了解什么是 Delta Time，并学习在 Unity 中用它让数值随时间平滑变化。

什么是 Delta Time？如何在游戏中将其用于对值进行平滑和解释？

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：[GetComponent](https://learn.unity.com/tutorial/getcomponent-1?language=zh&projectId=5e3afd88edbc2a2998252c77)

下一教程：[数据类型](https://learn.unity.com/tutorial/shu-ju-lei-xing?language=zh&projectId=5e3afd88edbc2a2998252c77)

## 1. DeltaTime

[Video](https://connect-mediagw.unity.com/h1/20200206/videos/08d5ea1c-ff0c-445b-a5ae-8cc15150eb7d_20_C__DeltaTime_in_Unity!___Beginner_Scripting_Tutorial.mp4) ([Transcript (zh_cn)](https://connect-mediagw.unity.com/h1/20200206/b895a80a-d01b-4965-8526-8ac5d2a3c49f_20_C__DeltaTime_in_Unity____Beginner_Scripting_Tutorial___Chinese.vtt))

## **UsingDeltaTimes**

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

public class UsingDeltaTime : MonoBehaviour
{
    public float speed = 8f; 
    public float countdown = 3.0f;

    
    void Update ()
    {
        countdown -= Time.deltaTime;
        if(countdown <= 0.0f)
            light.enabled = true;
        
         if(Input.GetKey(KeyCode.RightArrow))
            transform.position += new Vector3(speed * Time.deltaTime, 0.0f, 0.0f);
    }   
}
```