document.write('<select>'); 
for (var i = 1; i <= 20; i++) { 	
console.log(i); 	
document.write('<option>'+ i +'</option>'); 
}; 
document.write('</select>')
(Листинг 2.4)
var log = function(a) { 	
	console.log(a); 
} 
log('hi');