我如何將按鈕從我的Index.html連接到我的Unity代碼

`我有一個 Unity 3D 專案，我可以在其中使用叉車四處行駛，我想添加一些功能，例如拾取東西、放下東西和給材料著色。但是我在使用我的統一代碼連接按鈕（我在 index.html 中創建，它是在我使用 webgl 運行我的專案時生成的）時遇到問題。webgl 頁面如下所示： 我的項??目

我已經用 UnityLoader.instantiate 試過了，但它對我不起作用我收到以下錯誤： UnityLoader - error

這是我的 Index.html 中的腳本`

    <script>
      var container = document.querySelector("#unity-container");
      var canvas = document.querySelector("#unity-canvas");
      var loadingBar = document.querySelector("#unity-loading-bar");
      var progressBarFull = document.querySelector("#unity-progress-bar-full");
      var fullscreenButton = document.querySelector("#unity-fullscreen-button");
      var warningBanner = document.querySelector("#unity-warning");

      function unityShowBanner(msg, type) {
        function updateBannerVisibility() {
          warningBanner.style.display = warningBanner.children.length ? 'block' : 'none';
        }
        var div = document.createElement('div');
        div.innerHTML = msg;
        warningBanner.appendChild(div);
        if (type == 'error') div.style = 'background: red; padding: 10px;';
        else {
          if (type == 'warning') div.style = 'background: yellow; padding: 10px;';
          setTimeout(function() {
            warningBanner.removeChild(div);``
            updateBannerVisibility();
          }, 5000);
        }
        updateBannerVisibility();
      }

      var buildUrl = "Build";
      var loaderUrl = buildUrl   "/build.loader.js";
      var config = {
        dataUrl: buildUrl   "/build.data",
        frameworkUrl: buildUrl   "/build.framework.js",
        codeUrl: buildUrl   "/build.wasm",
        streamingAssetsUrl: "StreamingAssets",
        companyName: "DefaultCompany",
        productName: "warehouseOnline3D",
        productVersion: "0.1",
        showBanner: unityShowBanner,
      };

  
      if (/iPhone|iPad|iPod|Android/i.test(navigator.userAgent)) {
        // Mobile device style: fill the whole browser client area with the game canvas:

        var meta = document.createElement('meta');
        meta.name = 'viewport';
        meta.content = 'width=device-width, height=device-height, initial-scale=1.0, user-scalable=no, shrink-to-fit=yes';
        document.getElementsByTagName('head')[0].appendChild(meta);
        container.className = "unity-mobile";

        // To lower canvas resolution on mobile devices to gain some
        // performance, uncomment the following line:
        // config.devicePixelRatio = 1;

        canvas.style.width = window.innerWidth   'px';
        canvas.style.height = window.innerHeight   'px';

        unityShowBanner('WebGL builds are not supported on mobile devices.');
      } else {
        // Desktop style: Render the game canvas in a window that can be maximized to fullscreen:

        canvas.style.width = "960px";
        canvas.style.height = "600px";
      }

      loadingBar.style.display = "block";

      var script = document.createElement("script");
      script.src = loaderUrl;
      script.onload = () => {
        createUnityInstance(canvas, config, (progress) => {
          progressBarFull.style.width = 100 * progress   "%";
        }).then((unityInstance) => {
          loadingBar.style.display = "none";

          fullscreenButton.onclick = () => {
            unityInstance.SetFullscreen(1);
          };
        }).catch((message) => {
          alert(message);
        });
      };
      document.body.appendChild(script);
      
      var gameInstance = UnityLoader.instantiate("gameContainer", "Build/webgl.json");
      
      gameInstance.SendMessage("Sideloader", "test", "printed from webgl");  
    </script>

應該從 UnityLoader 呼叫的函式

uj5u.com熱心網友回復：

通過UnityLoaderafaik 的方式來自非常早期的 Unity WebGL 版本。

您想要將結果存盤在createUnityInstance塊內then，然后稍后使用它

<script>
    let instance = null;
    
    ....
    
    createUnityInstance(canvas, config, (progress) => {
          progressBarFull.style.width = 100 * progress   "%";
        }).then((unityInstance) => {
          instance = unityInstance;
    ...

然后你可以稍后使用它并做

instance.SendMessage("Sideloader", "test", "printed from webgl"); 

但是，您不能在腳本啟動級別的當前位置執行此操作。您將不得不等到then實際呼叫該塊，然后為您的按鈕執行此操作，例如

<button onclick='ButtonClick()'>test</button>

...

function ButtonClick()
{
    if(instance) instance.SendMessage("Sideloader", "test", "printed from webgl"); 
}

作為一個更復雜的替代方案，盡管您可以實作一個插件并讓 c# 部分向其中注入一個回呼，您可以稍后呼叫，一旦您的專案變得更復雜，您可能想要使用它。

例如有一個MyFancyPlugin.jslib

var myFancyPlugin = {
{    
    $CallbackPtr : {},

    InitializeJavaScript : function(callbackPtr)
    {
        CallbackPtr = callbackPtr;
    }

    FancyCall : function(value)
    {
        const valueSize = lengthBytesUTF8(value) 1;
        const valueBuffer = _malloc(dataUrlSize);
        stringToUTF8(value, valueBuffer, valueSize);
        Runtime.dynCall("vi", $CallbackPtr, [valueBuffer]);
        free(valueBuffer);
    }
};
autoAddDeps(myFancyPlugin, '$CallbackPtr');
mergInto(LibraryManager.library, myFancyPlugin);

然后在你的按鈕上做例如

<button onclick='FancyCall("TEST!")'>test</button>

然后c#有類似的東西

public static class MyFancyPlugin
{
    private delegate void Callback(string value);

    [DllImport("__Internal")]
    private static void InitializeJavaScript(Callback callback);

    public static void Initialize()
    {
        InitializeJavaScript(OnCallbackReceived);
    }

    [MonoPInvokeCallback(typeof(Callback))]
    private static void OnCallbackReceived(string value)
    {
        Debug.Log("Received from JavaScript: {value}");
    }
}

必須打電話的地方

MyFancyPlugin.Initialize();

當然

標籤：javascriptC＃网页格式unity3dwebgl

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