If I play Salvage and it got Defy, can I still draw 1?

No, you cannot draw a card if your Salvage is countered by Defy.

When a spell is countered, it is removed from the chain immediately and does not resolve. Because Salvage never resolves, its instructions—including the instruction to "Draw 1"—are never carried out.

According to RiftJudge FAQ #5046:

"When a spell is countered, it is removed from the chain without any resolution and none of the countered card's instructions will be carried out."

Sequence of events:

1. You play Salvage (it is placed on the chain).
2. Your opponent plays Defy in response (it is placed on the chain on top of Salvage).
3. Defy resolves first, countering Salvage.
4. Salvage is removed from the chain.
5. Because Salvage is no longer on the chain, it cannot resolve, and you do not draw a card.