Help us understand the problem. What is going on with this article?

プロパティの列挙

列挙

手段 自文可 自文不 自シ可 自シ不 親文可 親文不 親シ可 親シ不
for..in × × × × × ×
Object.keys × × × × × × ×
Object.getOwnPropertyNames × × × × × ×
Object.getOwnPropertyDescriptors × × × ×
Reflect.ownKeys() × × × ×

チェック

手段 自文可 自文不 自シ可 自シ不 親文可 親文不 親シ可 親シ不
in
obj.hasOwnProperty × × × ×
obj.propertyIsEnumerable × × × × × ×
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