Version: 2022.2
Build and distribute a WebGL application
Reduce load times with AssetBundles

Build your WebGL application

To create a build for WebGL, go to File > Build Settings from Unity’s main menu. In the Platform list, select WebGL and then click Switch Platform.

When you have configured the Build Settings, choose one the following options:

  • Build: Builds your application into a Player.
  • Build and Run: Builds your application in a Player, and opens that Player on your target platform.
Build Settings 窗口
Build Settings 窗口

The Unity build system for WebGL supports the following settings:

设置 功能
Texture Compression The texture compression format to use for the build. For more information, refer to WebGL texture compression. The available options are:
Use Player Settings This is the default selection. It uses the texture compression format you set in the Player settings window.
ETC2 Uses ETC2 format, which is widely supported on mobile devices.
ASTC Uses ASTC format, which is widely supported on mobile devices.
DXT Uses DXT format, which is widely supported on desktop devices.
Development Build Enable this setting to include scripting debug symbols and the Profiler in your build. When you enable this, Unity sets the DEVELOPMENT_BUILD scripting define. Use this setting only when you want to test your application because development builds don’t minify content, they’re large to distribute.
Code Optimization Select the optimization mode to use for compiling the WebGL code.
Speed This is the default setting. Select this to generate WebGL code that’s optimized for runtime performance.
Size Select this to generate WebGL code that’s optimized for build size. This is useful for reducing WebGL games to the smallest downloadable size, and for large projects if a mobile browser (Android or iOS) refuses to load the default optimize-for-speed WebAssembly builds as too large for mobile devices to consume.
Autoconnect Profiler Typically, when enabled, this setting allows you to automatically connect the Unity Profiler to your build. However for WebGL, as you can’t connect the Profiler to a running build, use this option to connect the content to the Editor instead. This is because the Profiler connection is handled using WebSockets on WebGL, but a web browser only allows outgoing connections from the content. For this setting to be available, you must enable the Development Build option.
Deep Profiling Enable this setting to activate Deep Profiling in the Profiler. This makes the Profiler instrument every function call in your application and returns more detailed profiling data. When you enable Deep Profiling Support, it might slow down script execution. This option is only available if you enable the Development Build option.
Build Use it to build your application.
Build And Run Use it to view the WebGL Player locally. Unity uses a local web server to host your build, and opens it from a localhost URL. Alternatively, you can use a custom local web server with properly configured response headers. For more information, see Compressed builds and server configuration.

For changing the settings for Asset Import Overrides, refer to Build Settings.

Build folder

The Build folder has the following files, where [ExampleBuild] represents the name of the target build folder.

文件名 包含
[ExampleBuild].loader.js The JavaScript code that the web page needs to load the Unity content.
[ExampleBuild].framework.js JavaScript 运行时和插件。
[ExampleBuild].wasm WebAssembly 二进制文件。
[ExampleBuild].mem A binary image to initialize the heap memory for your Player. Unity generates this file for multi-threaded WebAssembly builds only.
[ExampleBuild].data 资源数据和场景。
[ExampleBuild].symbols.json 调试错误堆栈跟踪所需的调试符号名称。仅当启用 Debug Symbols 选项时 (File > Build Settings > Player Settings),才会为 Release 构建生成此文件。
[ExampleBuild].jpg A background image, which displays while the build is loading. This file is only generated when a Background Image is available in the Player Settings (File > Build Settings > Player Settings > Splash Image). For more information, see Splash Screen.

If you enable a Compression Method for your build, Unity identifies the extension that corresponds with the compression method and adds this extension to the names of the files inside the Build sub folder. If you enable Decompression Fallback, Unity appends the extension .unityweb to the build file names. Otherwise, Unity appends the extension .gz for the Gzip compression method, or .br for the Brotli compression method. For more information, refer to Compressed builds and server configuration.

If you enable Name Files As Hashes in the Player Settings, Unity uses the hash of the file content instead of the default file name. This applies to each file in the build folder. This option allows you to upload updated versions of the game builds into the same folder on the server, and only upload the files which have changed between build iterations.

注意:在某些浏览器中可能无法直接从文件系统打开播放器。这是由于本地文件 URL 应用了安全限制。

Enable exceptions

Use Enable Exceptions to specify how unexpected code behavior (also known as errors) is handled at runtime. To access Enable Exceptions, go to the Publishing Settings section in WebGL Player Settings.

It has the following options:

  • None: Select this if you don’t need any exception support. This gives the best performance and smallest builds. With this option, any exception thrown causes your content to stop with an error in that setting.
  • Explicitly Thrown Exceptions Only (default): Select this to capture exceptions which are explicitly specified from a throw statement in your scripts and to also ensure finally blocks are called. Note that selecting this option makes the generated JavaScript code from your scripts longer and slower; This might only be an issue if scripts are the main bottleneck in your project.
  • Full Without Stacktrace: Select this option to capture: * Exceptions which are explicitly specified from throw statements in your scripts (the same as in the Explicitly Thrown Exceptions Only option)
    • Null 引用
    • 越界数组访问
  • Full With Stacktrace: This option is similar to the option above but it also captures Stack traces. Unity generates these exceptions by embedding checks for them in the code, so this option decreases performance and increases browser memory usage. Only use this for debugging, and always test in a 64-bit browser.
Build and distribute a WebGL application
Reduce load times with AssetBundles