Method update

packages/plugin-matterjs/lib/PhysicsSystem.ts:111–119

* 每一次游戏循环调用，可以做一些游戏操作，控制改变一些组件属性。 * * Called by every loop, can do some operation, change some property or other component property.

(e)

   * Called by every loop, can do some operation, change some property or other component property.
   */
  update(e) {
    const changes = this.componentObserver.clear();
    for (const changed of changes) {
      if (changed) {
        this.componentChanged(changed);
      }
    }
    this.engine.update(e);
  }

  componentChanged(changed: ComponentChanged) {
    if (changed.component instanceof Physics) {