block

block 用來創建一個區塊標籤，事後可以用 br 讓程式跳出該區塊標籤。

loop 和 block 相似卻相反，在 loop 中，在一輪循環結束或是使用 br 跳出時，程式會回到循環的開頭；而 block 則是會結束該區塊標籤的執行，跳到下一段程式碼。

嘗試一下

語法

wasm

;; label the block so that it can be branched to.
(block $my_block
  ;; branch to the block.
  ;; most of the time you'll want to put this in an if statement and only branch on condition,
  ;; otherwise the following control flow are unreachable.
  br $my_block
  ;; this will never be reached, since the br jumped out of the block already.
  unreachable
)

指令	二進制運算碼
`block`	`0x02`