Undo.RestoreSnapshot 恢复快照

static function RestoreSnapshot () : void

Description描述

Restore the snapshot state made with CreateSnapshot.

恢复通过CreateSnapshot制作的快照状态。

This can be used if a change in progress should be canceled; for example if the user presses Escape while dragging something.

当一个持续状态被改变时使用，例如用户拖曳某对象时按下了Escape。