window.onload = () => {
  ocpu.seturl("http://localhost:5656/ocpu/library/base/R");
  ar = [1, 2, 3, 4, 9, 2, 4, 5];

  let req = ocpu.call("plot", {
      x: ar,
      type: "o",
      col: "blue"
  }, (o) => {
      console.log(o);
      console.log(o.getFileURL("output.html"));
      console.log(o.getLoc());
      //$("#rplot").attr("src", o.getFileURL("output.html"));
  });

  // if fail
  req.fail(() => {
      alert("R Error!");
  });
}