변수가 정의되지 않았거나 null인지 확인. JavaScript

변수가 정의되지 않았거나 null인지 확인. JavaScript



undefined, null
JavaScript example code

JavaScript

  Output result
The variable is neither undefined nor null
The variable is neither undefined nor null
The variable is undefined or null
The variable is undefined or null
typeof
JavaScript example code

JavaScript

  Output result
The variable is neither undefined nor null
The variable is neither undefined nor null
The variable is undefined or null
The variable is undefined or null


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