完整报错堆栈
TypeError: wx.createOffscreenCanvas is not a function
    at createCanvas2D (canvas2d.js? [sm]:4)
    at createSkyTexture (mainBackground.js? [sm]:69)
    at drawSky (mainBackground.js? [sm]:91)
    at createMainBackground (mainBackground.js? [sm]:105)
    at createLoginScene (loginScene.js? [sm]:16)
    at Object._recreate (main.js? [sm]:302)
    at SceneManager.ensureScene (sceneManager.js? [sm]:341)
    at SceneManager._callee$ (sceneManager.js? [sm]:121)
    at s (regeneratorRuntime.js:1)
    at Generator.<anonymous> (regeneratorRuntime.js:1)
(env: Windows, mg, 2.01.2510270; lib: 3.14.1)
补充同链路衍生报错：


TypeError: canvas.getContext is not a function
    at createStarTexture (mainBackground.js? [sm]:117)
    at createMainBackground (mainBackground.js? [sm]:129)
    at createLoginScene (loginScene.js? [sm]:16)
    at Object._recreate (main.js? [sm]:302)
    at SceneManager.ensureScene (sceneManager.js? [sm]:341)
    at SceneManager._callee$ (sceneManager.js? [sm]:121)
    at s (regeneratorRuntime.js:1)
    at Generator.<anonymous> (regeneratorRuntime.js:1)
    at Generator.next (regeneratorRuntime.js:1)
    at asyncGeneratorStep (asyncToGenerator.js:1)
(env: Windows, mg, 2.01.2510270; lib: 3.14.1)
运行时诊断日志：


[canvas2d] runtime check:
{
  useCanvas2D: undefined,
  canOffscreen: false,
  sdkVersion: "3.14.2",
  hasGetOpenDataContext: true,
  hasGetSharedCanvas: false,
  inOpenDataContext: false
}
触发错误的具体流程


微信开发者工具导入项目（compileType: game），运行小游戏。


进入登录场景后创建背景，调用 createMainBackground。


在 createSkyTexture -> createCanvas2D 中执行 wx.createOffscreenCanvas({ type: '2d' })。


当前环境 wx.createOffscreenCanvas 为 undefined，立即抛出上述异常。

代码片段：https://developers.weixin.qq.com/s/Uj6vUTmC806B