not()not()

对其 bool 参数的值取反。Reverses the value of its bool argument.

not(false) == true

语法Syntax

not(expr)not(expr)

参数Arguments

  • expr:要取反的 bool 表达式。expr : A bool expression to be reversed.

返回Returns

返回其 bool 参数的反向逻辑值。Returns the reversed logical value of its bool argument.