Javascript代码执行顺序异常

I have a section of Javascript/Coffeescript that seems to be executing out of order.

console.log list
console.log list[card_number]
if list[card_number]
  console.log "MATCHES"
  new_card = list[card_number]
else
  console.log "NO MATCHES"
  new_card = create_new_card(card_number)

create_new_card: (card_number) ->
  new_card =
    card_number: card_number
  list[new_card.card_number] = new_card
  return new_card

每次运行时，第一个 console.log 都会显示包含 new_card 的卡片列表，即使卡片尚未创建.然后它总是点击 else，不管它运行多少次.

var a = [];
console.log(a);
a[0] = 3;

var a = [];
console.log(JSON.parse(JSON.stringify(a)));
a[0] = 3;