【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

1. ///* function getRedoStack()
   
2. /**
   
3. * Get the redo stack.
   
4. * @returns {Command[]} ICommand is an object. It include sheetName and cmd. the type of sheetName and cmd both is string.
   
5. */

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API：getUndoStack

1. ///* function getUndoStack()
   
2. /**
   
3. * Get the undo stack.
   
4. * @returns {Command[]} ICommand is an object. It include sheetName and cmd. the type of sheetName and cmd both is string.
   
5. */

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API：maxSize

1. ///* function maxSize(value?: number):any
   
2. /**
   
3. * Gets or sets the the undo/redo stack max size.
   
4. * @param {number} value this value should be greater or equal to 0.
   
5. * @returns {number | UndoManager} If no value is set. return the max size of undo/redo stack. otherwise return UndoManager.
   
6. */

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