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Rust开发WASM，浏览器运行WASM

article 2024/11/19 15:11:50

首先需要安装wasm-pack

cargo install wasm-pack

使用cargo创建工程

cargo new --lib mywasm

编辑Cargo.toml文件，修改lib的类型为cdylib，并且添加依赖wasm-bindgen

[package]
name = "mywasm"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[lib]
crate-type = ["cdylib"]

[dependencies]
wasm-bindgen = "0.2"

修改代码lib.rs

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub fn add(n1: usize, n2: usize) -> usize {
    n1 + n2
}

编译lib.rs生成wasm

wasm-pack build --target web

下载wasm-bindgen的过程大概需要10分钟，请耐心等待。

接下来创建文件index.html，使用wasm

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>wasm web demo</title>
  </head>
  <body>
    <script type="module">
      import init, {add} from "./pkg/mywasm.js";
      init().then(() => {
          console.log("add(1,2) = " + add(1, 2))
        });
      </script>
  </body>
</html>

启动测试用web server