1 //判断是否存在支持
 2 if(window.indexedDB){
 3     //打开一个数据存储库对象请求。指定参数存储库名和版本号。
 4     request = indexedDB.open("db_test",1);
 5
 6     //添加监听方法: 存储库不存在时触发该方法。
 7     request.onupgradeneeded = function (event){
 8         //存储库初始化的处理.
 9         //创建存储对象表和修改版本需要在此处处理
10         var db = event.target.result;
11     };
12
13     //添加监听方法: 打开储存库成功后触发
14     //若存在版本改变，则在onupgradeneeded之后触发
15     //通过event对象参数可以得到一个Database对象实例的引用db,通过db就可以进行数据的读写操作。
16     request.onsuccess = function (e){
17         //请求成功后处理
18         var db = e.target.result;
19     }
20 }

1 var store = db.createObjectStore("tb_test",{keyPath: "name"});//创建名为tb_test的存储对象，主键key指定为name属性。
2 store.createIndex("by_name","name",{unique: true});//创建索引

1 var tx, store, index, request;
2 tx = db.transaction("tb_test", "readwrite");//开启一个读写事务
3 store = tx.objectStore("tb_test");//获取需要处理的存储对象
4 request = store.put({name: "test", message: "OK"});//写入数据
5 request.onsuccess = function (e){};//写入成功
6 request.onerror = function (e){};//error

 1 var tx, store, index, request;
 2 tx = db.transaction("tb_test", "readonly");//开启一个只读事务
 3 store = tx.objectStore("tb_test");//获取需要处理的存储对象
 4 index = store.index("by_name");//获取一个索引
 5 request = index.get("test");//使用索引获取"test"对象的值
 6 request.onsuccess = function (e){
 7     var matching = e.target.result, v = matching;
 8     console.log(v);// -->{name: "test", message: "OK"}
 9 };
10 request.onerror = function (e){
11     console.log(e.message);
12 };

1 window.indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.msIndexedDB;
2 window.IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction;
3 window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange;

1 //在onsuccess的函数代码前添加，此部分代码只有部分旧版才会执行
2 if(db.version != dbVersion){
3     var svReq = db.setVersion(dbVersion);
4     svReq.onsuccess = function (e) {
5         //此时处理与onupgradeneeded中相同的初始化操作。
6     };
7 }

1 var READ_ONLY = (IDBTransaction && IDBTransaction.READ_ONLY == 0) ? 0 : "readonly";
2 var READ_WRITE = (IDBTransaction && IDBTransaction.READ_WRITE) || "readwrite";
3 var VERSION_CHANGE = (IDBTransaction && IDBTransaction.VERSION_CHANGE) || "versionchange";

1 var store = db.createObjectStore("tb_test",{keyPath: "name"});
2 store.createIndex("by_name","name",{unique: true});
3 store.transaction.oncomplete = function (e){
4     var db = e.target.db;
5     //此时事务已经完成。
6 };