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js继承语法

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js继承语法

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大佬说下，为什么后面会跟着undefined？


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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方法没有 return 默认return undefined

上面的undefined再怎么操作 也得给参数传齐活了 没有齐活必然undefined


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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