When I place a // at the end of script
then click test run, the engine always
complain "syntax error" of this line.

I'm not sure if it is a bug, it won't
happen if you add some blank lines
below it.

Yes, this is a bug. It's deep in the bowels of the compiler, so I haven't fixed it yet as it has an easy and obvious workaround. But I have the intention to get rid of this someday.

@vlau:

Quote:

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an easy and obvious workaround.

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Place an /*eof*/ comment at the end. This helps.

Usually I don't add any "//" at the end of my script,
I just discover it occasionally Anyway, thanks for
the tips.