Why does it output null when I follow the teacher's code?
 顾与相识
 顾与相识 2018-07-17 22:25:14
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when I follow the teacher’s code?
 顾与相识
 顾与相识

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无忌哥哥

Returning null may mean there are no parameters.

  • reply Thank you. I checked carefully and found that I made a mistake. I understand now. Thank you so much
     顾与相识 author 2018-07-18 09:30:08
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