Esta tradução está incompleta. Por favor, ajude a traduzir este artigo do Inglês.
WebAssembly é um novo tipo de código que pode ser executado nos navegadores da Web modernos — é uma linguagem de montagem de baixo nível com um formato binário compacto que é executado com desempenho quase nativo e fornece linguagens como C/C++ com um destino de compilação para que possam ser executadas na Web. Este também é projetado para funcionar com JavaScript, permitindo que ambos trabalhem juntos.
In a Nutshell
WebAssembly has huge implications for the web platform — it provides a way to run code written in multiple languages on the web at near native speed, with client apps running on the web that previously couldn’t have done so.
WebAssembly is designed to complement and run alongside JavaScript — using the WebAssembly JavaScript APIs, you can load WebAssembly modules into a JavaScript app and share functionality between the two. This allows you to take advantage of WebAssembly's performance and power and JavaScript's expressiveness and flexibility in the same apps, even if you don't know how to write WebAssembly code.
And what's even better is that it is being developed as a web standard via the W3C WebAssembly Working Group and Community Group with active participation from all major browser vendors.
Guias
- WebAssembly concepts
- Get started by reading the high-level concepts behind WebAssembly — what it is, why it is so useful, how it fits into the web platform (and beyond), and how to use it.
- Compiling a New C/C++ Module to WebAssembly
- When you’ve written code in C/C++, you can then compile it into .wasm using a tool like Emscripten. Let’s look at how it works.
- Compiling an Existing C Module to WebAssembly
- A core use-case for WebAssembly is to take the existing ecosystem of C libraries and allow developers to use them on the web.
- Loading and running WebAssembly code
- After you have a .wasm, this article covers how to fetch, compile and instantiate it, combining the WebAssembly JavaScript API with the Fetch or XHR APIs.
- Using the WebAssembly JavaScript API
- Once you've loaded a .wasm module, you'll want to use it. In this article we show you how to use WebAssembly via the WebAssembly JavaScript API.
- Exported WebAssembly functions
- Exported WebAssembly functions are the JavaScript reflections of WebAssembly functions which allow calling WebAssembly code from JavaScript. This article describes what they are.
- Understanding WebAssembly text format
- This article explains the wasm text format. This is the low-level textual representation of a .wasm module shown in browser developer tools when debugging.
- Converting WebAssembly text format to wasm
- This article provides a guide on how to convert a WebAssembly module written in the text format into a .wasm binary.
Referência de API
WebAssembly- This object acts as the namespace for all WebAssembly related functionality.
WebAssembly.Module()- A
WebAssembly.Moduleobject contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, and instantiated multiple times. WebAssembly.Instance()- A
WebAssembly.Instanceobject is a stateful, executable instance of aModule.Instanceobjects contain all the Exported WebAssembly functions that allow calling into WebAssembly code from JavaScript. WebAssembly.instantiateStreaming()- The
WebAssembly.instantiateStreaming()function is the primary API for compiling and instantiating WebAssembly code, returning both aModuleand its firstInstance. WebAssembly.Memory()- A
WebAssembly.Memoryobject is a resizableArrayBufferthat holds the raw bytes of memory accessed by anInstance. WebAssembly.Table()- A
WebAssembly.Tableobject is a resizable typed array of opaque values, like function references, that are accessed by anInstance. WebAssembly.CompileError()- Creates a new WebAssembly
CompileErrorobject. WebAssembly.LinkError()- Creates a new WebAssembly
LinkErrorobject. WebAssembly.RuntimeError()- Creates a new WebAssembly
RuntimeErrorobject.
Exemplos
- WASMSobel
- See our webassembly-examples repo for a number of other examples.
Especificações
| Especificação | Estado | Comentário |
|---|---|---|
| WebAssembly JavaScript Interface | Working Draft | Initial draft definition of the JavaScript API. |
Compatibilidade de navegador
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 57 | 16 | 522 | No | 44 | 11 |
CompileError | 57 | 16 | 522 | No | 44 | 11 |
Global | No | No | 62 | No | No | No |
Instance | 57 | 16 | 522 | No | 44 | 11 |
LinkError | 57 | 16 | 522 | No | 44 | 11 |
Memory | 57 | 16 | 522 | No | 44 | 11 |
Module | 57 | 16 | 522 | No | 44 | 11 |
RuntimeError | 57 | 16 | 522 | No | 44 | 11 |
Table | 57 | 16 | 522 | No | 44 | 11 |
compile | 57 | 16 | 522 | No | 44 | 11 |
compileStreaming | 61 | 16 | 58 | No | 47 | No |
instantiate | 57 | 16 | 522 | No | 44 | 11 |
instantiateStreaming | 61 | 16 | 58 | No | 47 | No |
validate | 57 | 16 | 522 | No | 44 | 11 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
CompileError | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
Global | No | No | No | 62 | No | No | No |
Instance | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
LinkError | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
Memory | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
Module | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
RuntimeError | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
Table | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
compile | 57 | 57 | Yes1 | 522 | 44 | 11 | 7.0 |
compileStreaming | 61 | 61 | No | 58 | ? | No | No |
instantiate | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
instantiateStreaming | 61 | 61 | No | 58 | ? | No | No |
validate | 57 | 57 | Yes1 | 522 | ? | 11 | 7.0 |
1. This feature is behind the Experimental JavaScript Features preference.
2. Disabled in the Firefox 52 Extended Support Release (ESR).