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Why does it output null when I follow the teacher's code?

when I follow the teacher’s code?
　顾与相识　顾与相识2407 days ago1374

reply all(1)I'll reply

  • 无忌哥哥

    无忌哥哥2018-07-18 09:19:25

    Returning null may mean there are no parameters.

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    • 　顾与相识

    Thank you. I checked carefully and found that I made a mistake. I understand now. Thank you so much

    — 　顾与相识 · 2018-07-18 09:30:08
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