gistfile1.txt

// ==UserScript==
// @name           OndemandBackupHatenaDiary
// @namespace      http://d.hatena.ne.jp/snaka72/
// @description    Backup editing diary on demand in hatena diary.
// @include        http://d.hatena.ne.jp/*/edit
// ==/UserScript==
// *** WARN: NOW ON PROGRESS!!!!!!!! ***
(function() {
const STORE_KEY="SAVED_DIARY_ENTRY";
var edit = document.getElementById('textarea-edit');

//add RESTORE button
var button = document.createElement('button');
button.innerHTML = "RESTORE";
button.addEventListener("click", function() {
  alert("click");
  GM_log(GM_getValue(STORE_KEY));
}, false);
var header = document.getElementById("diary-edit-header");
header.firstChild.appendChild(button);
GM_log(header);

GM_log(edit);
edit.addEventListener("change", function(e) {
  GM_log(e);
  GM_setValue(STORE_KEY, edit.value);
}, false);

})();