As stated in the definition, test returns a zero exit value if the expression value was True or a non-zero exit value (that is, 1).

根据定义，如果表达式值是True，那么test返回零退出值，否则返回非零退出值(即1)。

youdao

In Vimscript, as in c, only the numeric value zero is false in a Boolean context; any non-zero numeric value-whether positive or negative-is considered true.

和c一样，在Vimscript中，对于布尔值来说，只有数值0为假；任何非0数值—不管是正数还是负数—都为真。

youdao

The result register will be non-zero (or, true, all bits set to one) if the previous test for zero was true.

如果之前是否为零的测试的结果为真，那么结果寄存器将是非0(为真，所有位均被置1)。

youdao