javascript - Check if a field of type string/number is empty -

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I am working with my application. I have columns that differ on numbers from string datatype, I am facing some problem while one grid is valid for the vacuum of cells. It seems confusing and frustrating as easy as

It is that I'm using to check if the field is empty: 

  If (value == "") {// work here}   
 This works fine for columns with the  string  datatype, but when the datatype  If the number is the value of , then it fails to check the value as  at that time nan  I have mentioned several methods, lake Neither in vain, I also want to avoid nested or unnecessary IFS in this case ..   
 
 
 As a check can be done to check  
  as if (! Value) {// work here}   
 Which is  true   0 ,  "" ,  zero ,  undefined ,  false  and > nan   
 or if you want to test, the field is empty  not  you only have one  authenticity  Values ​​ 
  If (value) {// works here}   
 Which evaluates  true  If the value is not  not   false   (none above)

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