This example works in Firefox 4+ and Chrome. Note that Firefox does not allow local files to access indexedDB, so you'll need to run this example through a web server to get it to work on Firefox (Chrome does not have this restriction).

方法：createObjectStore需要两个参数，第一个是对象仓库的名称，第二个是一个js对象，例如{keyPath: 'userId', autoIncrement: false}，标明哪一个是主键，是否自增长