MouseManager.stopListeners 从未移除滚轮监听器 — 通过 canvas 保留已销毁的 Game

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/phaser.min.js"></script>
<script>
  const game = new Phaser.Game({ type: Phaser.AUTO, width: 640, height: 480 });

  setTimeout(() => {
    // Any surviving reference to the canvas — DevTools inspection, test
    // tooling, an app-level screenshot cache — plays this role in real apps.
    window.deadCanvas = game.canvas;
    game.destroy(true);

    setTimeout(() => {
      // In the DevTools console:
      // getEventListeners(window.deadCanvas)
      // → { wheel: [ { listener: onMouseWheel, … } ] } ← still attached
      //
      // Take a heap snapshot → filter "Game" → the destroyed Phaser.Game is
      // still reachable, retained via that wheel listener's closure.
      console.log('destroyed — inspect getEventListeners(window.deadCanvas)');
    }, 500);
  }, 1000);
</script>