public long f4Fun(IntPtr es)
{
long fun = ltf.GetJsParameter(es, 0);
long arg = ltf.String2JsValue(es, "C#执行了回掉函数");
long[] ptarg = { arg };
IntPtr arrayStore = Marshal.AllocHGlobal(ptarg.Length * sizeof(long));
Marshal.Copy(ptarg, 0, arrayStore, ptarg.Length);
ltf.JsCall(es, fun, arrayStore, 1);
return(ltf.JsUndefined());
}