【V14 Update1 新功能预览】API 获取 Undo/Redo 栈
SpreadJS 通过命令管理器提供了 Undo/Redo 功能，但有些用户想一次 Undo 多个步骤，或者 Undo 到指定的操作步骤，基于此， 新版本中讲通过几个 API 接口返回当前操作的 Undo/Redo 栈（数组），便于用户根据实际需求，自行控制，如下图：API：getRedoStack
///* function getRedoStack()
/**
* Get the redo stack.
* @returns {Command[]} ICommand is an object. It include sheetName and cmd. the type of sheetName and cmd both is string.
*/
API：getUndoStack
///* function getUndoStack()
/**
* Get the undo stack.
* @returns {Command[]} ICommand is an object. It include sheetName and cmd. the type of sheetName and cmd both is string.
*/
API：maxSize
///* function maxSize(value?: number):any
/**
* Gets or sets the the undo/redo stack max size.
* @param {number} value this value should be greater or equal to 0.
* @returns {number | UndoManager} If no value is set. return the max size of undo/redo stack. otherwise return UndoManager.
*/
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