实验性
When added, this component signifies that this entity is currently sheared.
只读
拥有此组件的实体。若该实体已被移除，则为 undefined。
The entity that owns this component. The entity will be undefined if it has been removed.
使用时可能会抛出异常。
This property can throw when used.
InvalidEntityError
返回组件是否有效。若组件的拥有者有效，并且组件需要的任何 额外验证也通过，则该组件被认为是有效的。
Returns whether the component is valid. A component is considered valid if its owner is valid, in addition to any addition to any additional validation required by the component.
组件的标识符。 Identifier of the component.
静态
When added, this component signifies that this entity is currently sheared.