FUNCTION:  isFinite
isFinite(testnumber)
 
The top-level function, isFinite, is used to determine if the argument, testnumber, is a finite and legal number. This function returns true for a finite number and otherwise returns false.
 
Code:
document.write(isFinite(2.2345))
 
Output:
true
 
Code:
document.write(isFinite(2.5E+345))
 
Output:
false
 
Code:
document.write(isFinite("Ima string"))
 
Output:
false

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