GopherJS XMLHttpRequest (XHR) and MakeFunc Example

var readyStateChange = js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} {
        if this.Get("readyState").Int() == 4 {
                if this.Get("status").Int() == 200 {
                        handleGetWordOK(this.Get("responseText").String())
                } else {
                        handleGetWordError()
                }
        }
        return nil
})

func xhrGetWordJson(w string) {
        req := js.Global.Get("XMLHttpRequest").New()
        req.Call("addEventListener", "readystatechange", readyStateChange)
        req.Call("open", "GET", HttpWordJsonPath(w), true)
        req.Call("send")
}