scanButton.addEventListener("click", async () => {

  log("User clicked scan button");

​

  try {

    const ndef = new NDEFReader();

    await ndef.scan();

    log("> Scan started");

​

    ndef.addEventListener("readingerror", () => {

      log("Argh! Cannot read data from the NFC tag. Try another one?");

    });

​

    ndef.addEventListener("reading", ({ message, serialNumber }) => {

      log(`> Serial Number: ${serialNumber}`);

      log(`> Records: (${message.records.length})`);

    });

  } catch (error) {

    log("Argh! " + error);

  }

});

​

writeButton.addEventListener("click", async () => {

  log("User clicked write button");

​

  try {

    const ndef = new NDEFReader();

    await ndef.write("Hello world!");

    log("> Message written");

  } catch (error) {

    log("Argh! " + error);

  }

});

​

makeReadOnlyButton.addEventListener("click", async () => {

  log("User clicked make read-only button");

​

  try {

    const ndef = new NDEFReader();

    await ndef.makeReadOnly();

    log("> NFC tag has been made permanently read-only");

  } catch (error) {

    log("Argh! " + error);

  }

});