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Panda-HJN avatar Panda-HJN commented on July 21, 2024 23

依次返回的是

//boolean
//string
//string

str是String的一个实例,所以str instanceof String返回的是 true
true是一个布尔值,所以typeof true返回的是 "boolean"

typeof 用于判断数据类型,以字符串的形式返回数据类型.
"boolean"是个字符串,所以 typeof "boolean" 返回的是"string"

typeof "string" 返回的是 "string"

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oceanpad avatar oceanpad commented on July 21, 2024 4 
boolean
string
string

str is String, so str instanceof String is true(Boolean). Then typeof Boolean is Boolean, return 'boolean'.
typeof's result is String, so typeof typeof ... all is string.

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