README
¶
"Hello world" WebAssembly sample
Create main.go:
package main
import (
"fmt"
"syscall/js"
)
func main() {
fmt.Println("Hello, WebAssembly!")
js.Global().Get("document").Call("getElementsByTagName", "body").
Index(0).Set("innerHTML", "Hello, World!")
}
Compile it for WebAssembly:
GOOS=js GOARCH=wasm go build -o main.wasm
Copy the JavaScript support file:
cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
Create index.html:
<html>
<head>
<meta charset="utf-8"/>
<script src="wasm_exec.js"></script>
<script>
const go = new Go();
WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((result) => {
go.run(result.instance);
});
</script>
</head>
<body></body>
</html>
Install goexec (if not installed yet):
go get -u github.com/shurcooL/goexec
Serve the three files (index.html, wasm_exec.js, and main.wasm) from a web server, with goexec:
goexec "http.ListenAndServe(\`:8080\`, http.FileServer(http.Dir(\`.\`)))"
Documentation
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