package main
import (
	"fmt"
	"github.com/gopherjs/gopherjs/js"
)
func main() {
	fmt.Println("Hello, playground")
	js.Global.Call("alert", "Hello, JavaScript")
	println("Hello, JS console")
}

$ gopherjs build
C:\Go\src\internal\poll\fd_windows.go:367:22: invalid operation: fd.pd (variable of type pollDesc) has no field or method runtimeCtx
C:\Go\src\internal\poll\fd_windows.go:368:22: invalid operation: fd.pd (variable of type pollDesc) has no field or method runtimeCtx
C:\Go\src\internal\poll\fd_windows.go:157:5: invalid operation: o.fd.pd (variable of type pollDesc) has no field or method runtimeCtx

$ go version
go version go1.9 windows/amd64
$ gopherjs version
GopherJS 1.9-1

package main
import (
	//"fmt"
	"github.com/gopherjs/gopherjs/js"
)
func main() {
	//fmt.Println("Hello, playground")
	js.Global.Call("alert", "Hello, JavaScript")
	println("Hello, JS console")
}