小探WebAssembly

WebAssembly的官方介绍：

WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable compilation target for programming languages, enabling deployment on the web for client and server applications.

WebAssembly: What Is It And Why Should You Care?

• 弥补JavaScript的性能不足
• 支持非浏览器的场景
• 促进Web平台的硬件支持
• 运行在与JavaScript相同的沙箱中，具有相同的安全限制
  • https://webassembly.org/docs/security/
  • https://hacks.mozilla.org/2017/07/memory-in-webassembly-and-why-its-safer-than-you-think/

wat格式有点类似汇编语言。wasm格式则是wat编译成的二进制格式。最大的好处是可以移植其他语言编写的代码到web上执行。

asm.js与Wasm有类似的目标，但是编译后的代码对标的是JavaScript。

emscripten可以将C/C++编译成wasm，使其在Web可用。

文中举了一个例子的。

Figma的故事：https://www.figma.com/blog/webassembly-cut-figmas-load-time-by-3x/

Microsoft gets serious about WebAssembly

写得不错。

其他

• World Wide Web Consortium (W3C) brings a new language to the Web as WebAssembly becomes a W3C Recommendation
• Using WebAssembly threads from C, C++ and Rust
• Can C++ be called from C# compiled to wasm?

2021-08-08更新

WebAssembly Concepts

Using the WebAssembly JavaScript API

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