CAPL: on sysVar_ Update difference on sysvar

on sysVar_update

System variable value as long as to update update, Even if it doesn't change , This event is also triggered by the program , such as 0-->0,0-->1 Will trigger .

on sysVar/on sysVar_change

System variables change , The program that triggers this event , such as 0-->1 Will trigger , but 0-->0 Not trigger .

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