golang
Go programmmig language
package main
import "fmt"
func main() {
fmt.Println("Hello, 世界")
}
WebAssembly
- On debian buster
- sudo apt install golang # go version go1.11.6 linux/amd64
- sudo apt install golang-src
- mkdir ~/wasmgotest
build.sh
go build -o main main.go GOOS=js GOARCH=wasm go build -o main.wasm main.go
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>
<h1 id="datetimeHeading">5555</h1>
<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;">
</canvas>
</body>
</html>main.go
package main
//import "fmt"
import "time"
import "syscall/js"
func showTime(){
for x := 0; ; x++ { // infinite loop
currentTime := time.Now()
// console.log in the browser
//fmt.Printf("Hello, WebAssembly %s ! \n" , currentTime.String() )
document := js.Global().Get("document")
document.Call("getElementById", "datetimeHeading").Set("innerHTML", currentTime.String())
//document.getElementById("datetimeHeading").innerHTML="aaa"
time.Sleep( 2 * time.Second )
}
}
func main() {
go showTime() // go routine executes the called function as a lightweight thread
document := js.Global().Get("document")
c := document.Call("getElementById","myCanvas")
ctx := c.Call("getContext","2d")
ctx.Call("beginPath")
ctx.Call("arc","95", "50", "40", "0", "6.283")
ctx.Call("stroke");
time.Sleep(24*time.Hour)
}- cp /usr/share/go-1.11/misc/wasm/wasm_exec.js .
Check on the browser file:///home/vitor/wasmgotest/index.html