写删除（write-delete）：该访问模式允许主体用任何，包括扩展(expanding)、收缩(shrinking)以及删除(deleting)的方法修改一个客体。
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Yes, you need write permission to delete a file.
是的，要删除一个文件，您需要写权限。
Write permission includes the ability to alter or delete an object.
写权限包括修改和删除对象的能力。
This callback is given the object being accessed, the name of the property being accessed, the type of access (read, write, or delete for example) and returns whether or not to allow access.
被访问的对象、被访问的属性名、访问的类型（例如读、写和删除）将被传递给回调函数，回调函数会返回是否允许访问。
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