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ts 定义一个num：number 但是 num默认值不想写数字 怎么破

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ts 定义一个num：number 但是 num默认值不想写数字 怎么破

ts 定义一个num：number 但是 num默认值不想写数字 并且if判断的时候偶默认值还是false 怎么破 写null和undefined都报错


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num: number | null


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