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Improve section order, explain more why .js and .html files are needed.

Dmitri Shuralyov 2018-09-16 11:07:40 -04:00
parent 9bec285a5d
commit dc4197ad1d
1 changed files with 9 additions and 7 deletions
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16
WebAssembly.md

@ -20,12 +20,20 @@ func main() {
}
```
Run:
Set `GOOS=js` and `GOARCH=wasm` environment variables to compile for WebAssembly:
```sh
$ GOOS=js GOARCH=wasm go build -o main.wasm
```
That will build the package and produce an executable WebAssembly module file main.wasm. The .wasm file extension will make it easier to serve it over HTTP with the correct Content-Type header later on. To execute main.wasm in a browser, we'll also need a JavaScript support file and an HTML page that connects everything together.
Copy the JavaScript support file:
```sh
$ cp $(go env GOROOT)/misc/wasm/wasm_exec.js .
```
Create an `index.html` file:
```HTML
@ -47,12 +55,6 @@ Create an `index.html` file:
(If your browser doesn't yet support `WebAssembly.instantiateStreaming`, you can use a [polyfill](https://github.com/golang/go/blob/b2fcfc1a50fbd46556f7075f7f1fbf600b5c9e5d/misc/wasm/wasm_exec.html#L17-L22).)
And copy over the JavaScript support file:
```sh
$ cp $(go env GOROOT)/misc/wasm/wasm_exec.js .
```
Then serve those three files (`index.html`, `wasm_exec.js`, and `main.wasm`) to a web browser. For example, with [`goexec`](https://github.com/shurcooL/goexec#goexec):
```sh