객체에 키가 있는지 확인. JavaScript

객체에 키가 있는지 확인. JavaScript



연산자에서 사용하여 개체에 키가 있는지 확인
JavaScript example code

JavaScript

  Output result
The key exists.
hasOwnProperty()를 사용하여 객체에 키가 있는지 확인
JavaScript example code

JavaScript

  Output result
The key exists.


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