問題
var obj = {}
obj //=> {}
typeof obj //=> "object"
obj instanceof Object //=> ?
var obj = Object.create(null)
obj //=> {}
typeof obj //=> "object"
obj instanceof Object //=> ?
答え
なんで?
var obj = {}
obj //=> {}
typeof obj //=> "object"
obj instanceof Object //=> true
var obj = Object.create(null)
obj //=> {}
typeof obj //=> "object"
obj instanceof Object //=> false