截断（浮点数到整数）

(module
  (import "console" "log" (func $log (param i32)))
  (func $main

    f32.const 10.5 ;; push an f32 onto the stack

    i32.trunc_f32_s ;; convert from f32 to signed i32 rounding towards zero (.5 will be lost)

    call $log ;; log the result

  )
  (start $main)
)

const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });

;; push an f32 onto the stack
f32.const 10.5

;; convert from f32 to signed i32 rounding towards zero (.5 will be lost)
i32.trunc_f32_s

;; the top item on the stack will now be the value 10 of type f32