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Lawguancong / Daily-Charging-Learning

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null & undefined区别 #3

Open Lawguancong opened 3 years ago

Lawguancong commented 3 years ago

null

不属于任何类型

undefined

缺少值 缺省值 未定义。 作用：比如默认参数

思考

typeof null -> object ?

参考链接

http://www.ruanyifeng.com/blog/2014/03/undefined-vs-null.html