The basic knowledge of unity scripts and the life cycle of scripts

/*Script is the instruction code attached to the game body to define the behavior of the game object

Unity supports three high-level programming languages: c#, Javascript
grammar structure
using namespace;
public class 类名：MonoBehaviour
{
```
 void 方法名（）
```
```
 {
```
```
 }
```
}
The file name and the class name must be consistent
The written script must be attached to the object to be executed
The script class attached to the game object must inherit from the MonoBehaviour class
* The object is just the object of the class
Compilation process:
Source code (CLS)->Intermediate language (dll file in unity)->(Mono Runtime)->Machine code
development tools
MomoDevolop
Unity comes with a script compiler to create Mono applications, suitable for integrated development environments for Linux, Mac OS X and windows, and supports c#, BOO and Java script, etc.
High-level programming language
VS
Microsoft's development tools include most of the tools needed in the entire software life cycle
Script life cycle: the whole process of unity script from wake-up to destruction
The initial phase
Awake Awakening:

当物体载入时立即调用一次：常用于在游戏开始前进行初始化，可以判断当满足某种条件执行此脚本 this。enable=true；

OnEnable when available:
```
 每当脚本对象启用时调用。
```
Start:

 物体载入且脚本对象启用时被调用有一次。常用于数据或游戏逻辑初始化，执行时机晚于  Awake。

Physical stage
FixUpdate fixed update:

 脚本启用后，固定时间被调用，适用于对游戏对象做物理操作，例如移动等

 设置更新频率;"Edit"-->"Project Setting"-->"Time"-->"FixUpdate"值，默认为0.02s

Update:

  脚本启用后，每帧渲染场景时调用，频率与设备性能和渲染量有关

LateUpdate delayed update:

  在Upfate函数被调用后执行，适用于跟随逻辑

Input event
OnMouseEnter mouse move in:

     鼠标一道当前Collider时调用。

OnMouseOver mouse over:

     鼠标经过当前Collider时调用

OnMouseExit mouse away:

     鼠标离开当前Collider时调用

OnMouseDown mouse down:
```
     鼠标按下时被调用
```
OnMouseUp mouse up:

     鼠标在当前Collider上抬起时调用

Scene rendering
OnBecameVisible when visible:

     当Mesh Renderer在任何相机上可见时调用

OnBecameInvisible when invisible:

     当MeshRenderer在任何相机上都不可见时调用

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
///
///Script Lifecycle
///
public class Lifecycle: MonoBehaviour
{ //Script: .cs text file class file // attached to game objects Medium //c# class: //Field //Properties (not written in the general script, cannot be displayed in the panel) //Constructor //Method [SerializeField]//Serialize the field, display the private variable private int in the compiler a=100; [HideInInspector]//Function: hide the field in the compiler public float b = 0; //public Lifecycle() //{//Do not write the constructor in the script // //Cannot be in the child thread Access to the main thread member // float c = time.time; //} public Lifecycle() { Debug.Log("Constructor"); } // Initial stage

//
private void Awake()//Execution timing: create a game object (the script may not be enabled at this time) Immediately start execution and execute only once Function: Initialize
{ //Debug.Log("Awake–" + Time.time+"–" +this.name); } private void Start()//When the Awake function is executed: create game object -> script enable -> execute only once. Function: initialize { int a = 1;//input code during debugging : Int b = 2;//Right-click – Quickly monitor int c = a + b;//View "instant window" Debug.Log("start–" + Time.time+"–"+this.name); } // The physical phase

*//
private void FixedUpdate()// is executed every fixed time. (Time can be modified) Applicability: Suitable for physical manipulation of game objects (moving, rotating...) will not be affected by rendering time
{//Rendering time is not fixed (the amount of rendering per frame is different, and the machine performance is different)
//Debug.Log (Time.time);
}
private void OnMouseDown()
{ Debug.Log(" OnMouseDown"); }

private void Update()//Execution timing: rendering frame execution, execution interval is not fixed Applicability: processing game logic
{ //Single frame debugging: start debugging, run scene, pause game plus breakpoint, single frame run end debugging } }

The basic knowledge of unity scripts and the life cycle of scripts

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