基础H1

WebGL：与浏览器脚本交互 - Unity 手册

从 Unity 脚本调用 JavaScript 函数H2

使用jslib定义

jsx
mergeInto(LibraryManager.library, {

  Hello: function () {
    window.alert("Hello, world!");
  },

  HelloString: function (str) {
    window.alert(Pointer_stringify(str));
  },

  PrintFloatArray: function (array, size) {
    for(var i = 0; i < size; i++)
    console.log(HEAPF32[(array >> 2) + i]);
  },

  AddNumbers: function (x, y) {
    return x + y;
  },

  StringReturnValueFunction: function () {
    var returnStr = "bla";
    var bufferSize = lengthBytesUTF8(returnStr) + 1;
    var buffer = _malloc(bufferSize);
    stringToUTF8(returnStr, buffer, bufferSize);
    return buffer;
  },

  BindWebGLTexture: function (texture) {
    GLctx.bindTexture(GLctx.TEXTURE_2D, GL.textures[texture]);
  },

});

从 C# 脚本调用这些函数

csharp
using UnityEngine;
using System.Runtime.InteropServices;

public class NewBehaviourScript : MonoBehaviour {

    [DllImport("__Internal")]
    private static extern void Hello();

    [DllImport("__Internal")]
    private static extern void HelloString(string str);

    [DllImport("__Internal")]
    private static extern void PrintFloatArray(float[] array, int size);

    [DllImport("__Internal")]
    private static extern int AddNumbers(int x, int y);

    [DllImport("__Internal")]
    private static extern string StringReturnValueFunction();

    [DllImport("__Internal")]
    private static extern void BindWebGLTexture(int texture);

    void Start() {
        Hello();
        
        HelloString("This is a string.");
        
        float[] myArray = new float[10];
        PrintFloatArray(myArray, myArray.Length);
        
        int result = AddNumbers(5, 7);
        Debug.Log(result);
        
        Debug.Log(StringReturnValueFunction());
        
        var texture = new Texture2D(0, 0, TextureFormat.ARGB32, false);
        BindWebGLTexture(texture.GetNativeTextureID());
    }
}

从 JavaScript 调用 Unity 脚本函数H2

建议的做法是调用内容中的游戏对象上的方法。如果要从嵌入在项目中的 JavaScript 插件执行调用，可使用以下代码

jsx
unityInstance.SendMessage(objectName, methodName, value);

其中，objectName 是场景中的对象名称；methodName 是当前附加到该对象的脚本中的方法名称；value 可以是字符串、数字，也可为空。例如：

ReactH1

React和Unity通信H2

示例

jsx
// File: App.jsx

import React from "react";
import Unity, { UnityContext } from "react-unity-webgl";

const unityContext = new UnityContext({
  loaderUrl: "build/myunityapp.loader.js",
  dataUrl: "build/myunityapp.data",
  frameworkUrl: "build/myunityapp.framework.js",
  codeUrl: "build/myunityapp.wasm",
});

function App() {
  function spawnEnemies() {
    unityContext.send("GameController", "SpawnEnemies", 100);
  }

  return (
    <div>
      <button onClick={spawnEnemies}>Spawn a bunch!</button>
      <Unity unityContext={unityContext} />
    </div>
  );
}

csharp
// File: EnemyController.cs
// Attached to GameObject "GameController"

public class EnemyController : MonoBehaviour {
  public void SpawnEnemies (int amount) {
    Debug.Log ($"Spawning {amount} enemies!");
  }
}

Unity 和 React 通信H2

示例

React订阅

csharp
// File: App.jsx

import React, { useState, useEffect } from "react";
import Unity, { UnityContext } from "react-unity-webgl";

const unityContext = new UnityContext({
  loaderUrl: "build/myunityapp.loader.js",
  dataUrl: "build/myunityapp.data",
  frameworkUrl: "build/myunityapp.framework.js",
  codeUrl: "build/myunityapp.wasm",
});

function App() {
  const [isGameOver, setIsGameOver] = useState(false);
  const [userName, setUserName] = useState("");
  const [score, setScore] = useState(0);

  useEffect(function () {
    unityContext.on("GameOver", function (userName, score) {
      setIsGameOver(true);
      setUserName(userName);
      setScore(score);
    });
  }, []);

  return (
    <div>
      {isGameOver === true && <p>{`Game Over! ${userName} ${score} points`}</p>}
      <Unity unityContext={unityContext} />
    </div>
  );
}

Utility发送

csharp
// File: MyPlugin.jslib

mergeInto(LibraryManager.library, {
  GameOver: function (userName, score) {
    ReactUnityWebGL.GameOver(Pointer_stringify(userName), score);
  },
});

/// File: GameController.cs

using UnityEngine;
using System.Runtime.InteropServices;

public class GameController : MonoBehaviour {

  [DllImport("__Internal")]
  private static extern void GameOver (string userName, int score);

  public void SomeMethod () {
#if (UNITY_WEBGL == true && UNITY_EDITOR == false)
    GameOver ("Player1", 100);
#endif
  }
}