/ .

1. 1 4 .

   let i = 0;
   while (++i < 5) alert( i );

   ++i i while 1 5 (1 < 5), 1 .

   1 2, 3, 4 . i ++ 5 .

   i = 4 i 5 while(5 < 5) . 5 .

2. 1 5 .

   let i = 0;
   while (i++ < 5) alert( i );

   i++ i . while 0 5 (0 < 5). .

   alert 1 . i .

   1 2, 3, 4 .

   i = 4 . (++i) 5 5 , (i++) i 4 . while(4 < 5) , alert .

   while(5 < 5) 5 .