For some functions, a numeric value is input, for example start, length, and offset parameters of string functions.

一些函数的输入是数值，比如字符串函数的起始、长度和偏移量参数。

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Event parameters: the number of parameters and their length is event specific.

事件参数：参数的个数及其长度是与具体命令相关的。

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Command parameters: the number of parameters and their length is command specific.

命令参数：参数的个数及其长度是与具体命令相关的。

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