菜鸟学堂在线工具

源代码

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>菜鸟学堂</title> 
<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 LOGS (id unique, log)');
            tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "菜鸟学堂")');
            tx.executeSql('INSERT INTO LOGS (id, log) VALUES (2, "www.")');
            msg = '<p>数据表已创建，且插入了两条数据。</p>';
            document.querySelector('#status').innerHTML =  msg;
         });

db.transaction(function (tx) {
              tx.executeSql('DELETE FROM LOGS  WHERE id=1');
              msg = '<p>删除 id 为 1 的记录。</p>';
              document.querySelector('#status').innerHTML =  msg;
         });

db.transaction(function (tx) {
             tx.executeSql('UPDATE LOGS SET log=\'\' WHERE id=2');
              msg = '<p>更新 id 为 2 的记录。</p>';
              document.querySelector('#status').innerHTML =  msg;
         });

db.transaction(function (tx) {
            tx.executeSql('SELECT * FROM LOGS', [], function (tx, results) {
               var len = results.rows.length, i;
               msg = "<p>查询记录条数: " + len + "</p>";
               document.querySelector('#status').innerHTML +=  msg;
               
               for (i = 0; i < len; i++){
                  msg = "<p><b>" + results.rows.item(i).log + "</b></p>";
                  document.querySelector('#status').innerHTML +=  msg;
               }
            }, null);
         });
         
      </script>
</head>
<body>
<div id="status" name="status">状态信息</div>
</body>
</html>

运行结果 在线运行