サーバーとのファイル入出力

<textarea id="idData" name="comment" cols="80" rows="40"></textarea>

<script>

function Load()

{

  var c = new XMLHttpRequest();

  c.open("GET", "data.txt", true);

  c.send(null);

  c.onload = function () {

    if (c.status === 200) {

      document.getElementById("idData").innerHTML = c.responseText;

    }

  };

}

</script>

function Save()

{

  var c = new XMLHttpRequest();

  c.onreadystatechange = function(){

    if (c.readyState == 4 && c.status == 200) {

    }

  }

  var t = document.getElementById("idData").value.split('\n');

  t = t.join('<br>');

  c.open("get", "saver.php?text=" + t, true);

  c.send(null);

}

<?php

  if (isset($_GET["text"])) {

    $t = preg_split("/<br>/", $_GET["text"]);

    $t = implode("\n", $t);

    file_put_contents("data.txt", $t);

  }

?>

<label for="id">名前</label><input type="text" id="idName" name="id" placeholder="" value="" size="6">

  c.open("GET", document.getElementById('idName').value, true);

c.open("get", "saver.php?text=" + t + "&filename=" + document.getElementById('idName').value, true);

    file_put_contents($_GET["filename"], $t);

      var text = c.responseText;

      {

        var st = text.split('\n');

        st.shift();

        st.pop();

        text = st.join('\n');

      }

  var t = document.getElementById("idData").innerHTML.split('\n');

  {

    t.unshift("var texts = [");

    t.push("];");

  }

  t = t.join('<br>');