function digits_count(n) {  
      var count = 0;  
      if (n > 1) ++count;  
      
      while (n / 10 >= 1) {  
        n /= 10;  
        ++count;  
      }  
      
      return count;  
    }  
      
    console.log(digits_count(12112));  
      
    console.log(digits_count(457));