// +build js package main import ( "fmt" "syscall/js" "time" ) func main() { // GOARCH=wasm GOOS=js /home/$yourusername/go1.14/bin/go build -o hello.wasm hello_go114.go js.Global().Get("console").Call("log", "Hello Webassembly!") message := fmt.Sprintf("Hello, the current time is: %s", time.Now().String()) js.Global().Get("document").Call("getElementById", "hello").Set("innerText", message) }