解决 Flutter Web 加载慢的问题

最近在做一个 Flutter 2.0 for Web 的项目，在项目打开第一次运行的时候，总是要等很久才能看到效果.
经过一番研究发现是 Flutter 使用的一个渲染引擎 Canvaskit 下载太慢导致的.

解决方法

Canvaskit 是一个 js 框架，Flutter 定义默认是从 https://unpkg.com 去加载的，在国内最好是改变这个地址，让它通过镜像地址去加载.

编译发布修改

在 {SDK_PATH}/bin/cache/flutter_web_sdk/lib/_engine/engine/canvaskit/initialization.dart 文件中有定义:

/// The URL to use when downloading the CanvasKit script and associated wasm.
///
/// The expected directory structure nested under this URL is as follows:
///
///     /canvaskit.js              - the release build of CanvasKit JS API bindings
///     /canvaskit.wasm            - the release build of CanvasKit WASM module
///     /profiling/canvaskit.js    - the profile build of CanvasKit JS API bindings
///     /profiling/canvaskit.wasm  -