html5 web sql database 能建数据库不能建表怎么回事

现在是数据库能建起来表建不起来
代码如下

  <script type="text/javascript">
 var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);
 var msg;
 db.transaction(function (tx) {
    tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS1 (id unique, log)');
   tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "foobar")');
  tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "2222")');
   msg = '<p>Log message created and row inserted.</p>';
   document.querySelector('#status').innerHTML =   msg;
 });
 </script>

  </head>

  <body>
  <a href="a.jsp">hahhahhah</a>
    <div id="status" name="status"></div>

use 语句加上了吗？