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The open mode for open sjs function.
• incremental = 2
incremental open mode. When opening file, UI and UI event could be refreshed and responsive directly.
• lazy = 1
lazy open mode. When opening file, only the active sheet will be loaded directly. Other sheets will be loaded only when they are be used.
• normal = 0
normal open mode, without lazy and incremental. When opening file, UI and UI event could be refreshed and responsive at specific time points.