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                <form id="myForm" action="">
		<input type="submit" id="submit" value="Add">




                var db;
	var myForm = document.getElementById('myForm');
	var submit = document.getElementById('submit');

	// onload
	window.onload = function() {
		// データベースオープン
		var myDb ="myDb", 1);

		// onerror イベントハンドラ生成
		myDb.onerror = function() {
			alert("Database error: " +;

		// onsuccess イベントハンドラ生成
		myDb.onsuccess = function() {
	        db = myDb.result;

		// onupgradeneeded イベントハンドラ生成
		// データベース作成、バージョン更新
		myDb.onupgradeneeded = function(){
			// 'myDb'を代入
			var db =;
			// オブジェクトストア(RDBにおけるテーブル)を作成
			// キージェネレータ(autoIncrement)を使用
			var creObjStore = db.createObjectStore('item', { autoIncrement : true });
			// インデックス作成 重複する可能性があるため一意のインデックスは使用不可({unique: false})
			creObjStore.createIndex('subject','subject', {unique: false});
			creObjStore.createIndex('content','content', {unique: false});

		function addData(e) {
			var newItem = [
				{ subject: 15, content: 35}
			var transaction = db.transaction(["item"], "readwrite");
			transaction.oncomplete = function() {