JS is determined whether a valid value is null or undefined

Others 2020-01-26 17:46:16 views: null

On the code:

 if ( some_variable == null ){
   // some_variable is either null or undefined
 }

More Code:

if ( !some_variable ) {
  // some_variable is either null, undefined, 0, NaN, false, or an empty string
}

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Origin blog.csdn.net/henryhu712/article/details/103751055

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