function is_Numeric(num) {  
  return !isNaN(parseFloat(num)) && isFinite(num);  
}  
  
console.log(is_Numeric(12));  
console.log(is_Numeric('abcd'));  
console.log(is_Numeric('12'));  
console.log(is_Numeric(' '));  
console.log(is_Numeric(1.20));  
console.log(is_Numeric(-200));