تحقق مما إذا كان المتغير غير محدد أو لاغٍ. JavaScript

تحقق مما إذا كان المتغير غير محدد أو لاغٍ. 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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